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Network Working Group                                         P. Hoffman
Internet-Draft                                            VPN Consortium
Obsoletes: 2629 (if approved)                         September 29, 2014
Intended status: Informational
Expires: April 2, 2015


                   The 'XML2RFC' version 3 Vocabulary
                      draft-hoffman-xml2rfc-11

Abstract

   This document defines the "XML2RFC" version 3 vocabulary; an XML-
   based language used for writing RFCs and Internet-Drafts.  It is
   heavily derived from the version 2 vocabulary that is also under
   discussion.  This document obsoletes the v2 grammar described in RFC
   2629 and its expected followup, draft-reschke-xml2rfc.

Editorial Note (To be removed by RFC Editor)

   Discussion of this draft takes place on the rfc-interest mailing list
   (rfc-interest@rfc-editor.org), which has its home page at
   <https://www.rfc-editor.org/mailman/listinfo/rfc-interest>.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 2, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents



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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.1.  Design Criteria for the Changes in v3 . . . . . . . . . .   5
     1.2.  Differences from v2 to v3 . . . . . . . . . . . . . . . .   6
       1.2.1.  New Elements in v3  . . . . . . . . . . . . . . . . .   6
       1.2.2.  New Attributes for Existing Elements  . . . . . . . .   7
       1.2.3.  Elements and Attributes Deprecated from v2  . . . . .   7
       1.2.4.  Additional Changes from v2  . . . . . . . . . . . . .   8
     1.3.  Syntax Notation . . . . . . . . . . . . . . . . . . . . .   9
   2.  Elements  . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     2.1.  <abstract>  . . . . . . . . . . . . . . . . . . . . . . .  10
     2.2.  <address> . . . . . . . . . . . . . . . . . . . . . . . .  10
     2.3.  <annotation>  . . . . . . . . . . . . . . . . . . . . . .  10
     2.4.  <area>  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     2.5.  <artwork> . . . . . . . . . . . . . . . . . . . . . . . .  12
     2.6.  <aside> . . . . . . . . . . . . . . . . . . . . . . . . .  15
     2.7.  <author>  . . . . . . . . . . . . . . . . . . . . . . . .  15
     2.8.  <b> . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
     2.9.  <back>  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     2.10. <bcp14> . . . . . . . . . . . . . . . . . . . . . . . . .  18
     2.11. <blockquote>  . . . . . . . . . . . . . . . . . . . . . .  18
     2.12. <city>  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     2.13. <code>  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     2.14. <country> . . . . . . . . . . . . . . . . . . . . . . . .  20
     2.15. <cref>  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     2.16. <date>  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     2.17. <dd>  . . . . . . . . . . . . . . . . . . . . . . . . . .  22
     2.18. <displayreference>  . . . . . . . . . . . . . . . . . . .  23
     2.19. <dl>  . . . . . . . . . . . . . . . . . . . . . . . . . .  24
     2.20. <dt>  . . . . . . . . . . . . . . . . . . . . . . . . . .  25
     2.21. <em>  . . . . . . . . . . . . . . . . . . . . . . . . . .  25
     2.22. <email> . . . . . . . . . . . . . . . . . . . . . . . . .  26
     2.23. <eref>  . . . . . . . . . . . . . . . . . . . . . . . . .  27
     2.24. <figure>  . . . . . . . . . . . . . . . . . . . . . . . .  27
     2.25. <front> . . . . . . . . . . . . . . . . . . . . . . . . .  29
     2.26. <i> . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
     2.27. <iref>  . . . . . . . . . . . . . . . . . . . . . . . . .  30
     2.28. <keyword> . . . . . . . . . . . . . . . . . . . . . . . .  31
     2.29. <li>  . . . . . . . . . . . . . . . . . . . . . . . . . .  31



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     2.30. <link>  . . . . . . . . . . . . . . . . . . . . . . . . .  33
     2.31. <middle>  . . . . . . . . . . . . . . . . . . . . . . . .  34
     2.32. <name>  . . . . . . . . . . . . . . . . . . . . . . . . .  34
     2.33. <note>  . . . . . . . . . . . . . . . . . . . . . . . . .  35
     2.34. <ol>  . . . . . . . . . . . . . . . . . . . . . . . . . .  35
     2.35. <organization>  . . . . . . . . . . . . . . . . . . . . .  37
     2.36. <phone> . . . . . . . . . . . . . . . . . . . . . . . . .  37
     2.37. <postal>  . . . . . . . . . . . . . . . . . . . . . . . .  37
     2.38. <postalLine>  . . . . . . . . . . . . . . . . . . . . . .  38
     2.39. <refcontent>  . . . . . . . . . . . . . . . . . . . . . .  38
     2.40. <reference> . . . . . . . . . . . . . . . . . . . . . . .  40
     2.41. <referencegroup>  . . . . . . . . . . . . . . . . . . . .  40
     2.42. <references>  . . . . . . . . . . . . . . . . . . . . . .  41
     2.43. <region>  . . . . . . . . . . . . . . . . . . . . . . . .  41
     2.44. <rfc> . . . . . . . . . . . . . . . . . . . . . . . . . .  42
     2.45. <section> . . . . . . . . . . . . . . . . . . . . . . . .  46
     2.46. <seriesInfo>  . . . . . . . . . . . . . . . . . . . . . .  48
     2.47. <sourcecode>  . . . . . . . . . . . . . . . . . . . . . .  49
     2.48. <street>  . . . . . . . . . . . . . . . . . . . . . . . .  51
     2.49. <strong>  . . . . . . . . . . . . . . . . . . . . . . . .  52
     2.50. <sub> . . . . . . . . . . . . . . . . . . . . . . . . . .  53
     2.51. <sup> . . . . . . . . . . . . . . . . . . . . . . . . . .  53
     2.52. <t> . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
     2.53. <table> . . . . . . . . . . . . . . . . . . . . . . . . .  56
     2.54. <tbody> . . . . . . . . . . . . . . . . . . . . . . . . .  56
     2.55. <td>  . . . . . . . . . . . . . . . . . . . . . . . . . .  57
     2.56. <tfoot> . . . . . . . . . . . . . . . . . . . . . . . . .  58
     2.57. <th>  . . . . . . . . . . . . . . . . . . . . . . . . . .  58
     2.58. <thead> . . . . . . . . . . . . . . . . . . . . . . . . .  60
     2.59. <title> . . . . . . . . . . . . . . . . . . . . . . . . .  60
     2.60. <tr>  . . . . . . . . . . . . . . . . . . . . . . . . . .  60
     2.61. <tt>  . . . . . . . . . . . . . . . . . . . . . . . . . .  61
     2.62. <ul>  . . . . . . . . . . . . . . . . . . . . . . . . . .  62
     2.63. <uri> . . . . . . . . . . . . . . . . . . . . . . . . . .  63
     2.64. <workgroup> . . . . . . . . . . . . . . . . . . . . . . .  63
     2.65. <xref>  . . . . . . . . . . . . . . . . . . . . . . . . .  63
   3.  Elements from v2 That Have Been Deprecated  . . . . . . . . .  66
     3.1.  <c> . . . . . . . . . . . . . . . . . . . . . . . . . . .  66
     3.2.  <facsimile> . . . . . . . . . . . . . . . . . . . . . . .  67
     3.3.  <format>  . . . . . . . . . . . . . . . . . . . . . . . .  67
     3.4.  <list>  . . . . . . . . . . . . . . . . . . . . . . . . .  68
     3.5.  <postamble> . . . . . . . . . . . . . . . . . . . . . . .  68
     3.6.  <preamble>  . . . . . . . . . . . . . . . . . . . . . . .  69
     3.7.  <spanx> . . . . . . . . . . . . . . . . . . . . . . . . .  70
     3.8.  <texttable> . . . . . . . . . . . . . . . . . . . . . . .  71
     3.9.  <ttcol> . . . . . . . . . . . . . . . . . . . . . . . . .  72
     3.10. <vspace>  . . . . . . . . . . . . . . . . . . . . . . . .  73
   4.  Internationalization Considerations . . . . . . . . . . . . .  73



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   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  73
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  73
     6.1.  Internet Media Type Registration  . . . . . . . . . . . .  74
     6.2.  Link Relation Registration  . . . . . . . . . . . . . . .  75
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  75
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  76
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  76
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  76
   Appendix A.  Front Page Generation  . . . . . . . . . . . . . . .  78
     A.1.  The /rfc/@category Attribute  . . . . . . . . . . . . . .  78
     A.2.  The /rfc/@ipr Attribute . . . . . . . . . . . . . . . . .  78
       A.2.1.  Current Values: '*trust200902'  . . . . . . . . . . .  79
       A.2.2.  Historic Values . . . . . . . . . . . . . . . . . . .  80
   Appendix B.  The v3 Format and Processors . . . . . . . . . . . .  81
     B.1.  Including External Text . . . . . . . . . . . . . . . . .  82
     B.2.  Anchors and IDs . . . . . . . . . . . . . . . . . . . . .  83
       B.2.1.  Overlapping Values  . . . . . . . . . . . . . . . . .  84
   Appendix C.  Relax NG Schema  . . . . . . . . . . . . . . . . . .  85
   Appendix D.  Schema Differences from v2 . . . . . . . . . . . . . 100
   Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115































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1.  Introduction

   This document describes version 3 ("v3") of the "XML2RFC" vocabulary;
   an XML-based language ('Extensible Markup Language', [XML]) used for
   writing RFCs ([RFC7322]) and Internet-Drafts ([IDGUIDE]).

   This document obsoletes the version ("v2") vocabulary [XML2RFCv2],
   which contains the extended language definition.  That document in
   turn obsoletes the original version ("v1") [RFC2629].  This document
   directly copies the material from [XML2RFCv2] where possible; as that
   document makes its way toward RFC publication, this document will
   incorporate as many of the changes as possible.

   The v3 format will be used as part of the new RFC series described in
   [RFC6949].  The new format will be handled by one or more new
   processors for checking the XML and converting it to other
   representations.  Features of the expected processors are described
   in Appendix B.

   Note that the vocabulary contains certain constructs that might not
   be used when generating of the final text; however, they can provide
   useful data for other uses (such as index generation, populating a
   keyword database, or syntax checks).

   In this document, the term "format" is used when describing types of
   documents, primarily XML and HTML.  The term "representation" is used
   when talking about a specific instatiation of a format, such as an
   XML document or an HTML document that was created by an XML document.

   The following two sections are a hopefully-complete list of all the
   technical changes between [XML2RFCv2] and this document, as well as
   the design criteria for those changes.

1.1.  Design Criteria for the Changes in v3

   The design criteria of the changes from v2 to v3 are:

   o  The intention is that starting and editing a v3 document will be
      easier than for a v2 document.

   o  There will be good v2-to-v3 conversion tools for when an author
      wants to change versions.

   o  There are no current plans to make v3 XML the required submission
      representation for drafts or RFCs.  That might happen eventually,
      but it is likely to be years away.

   There is a desire to keep as much of the v2 grammar as makes sense



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   within the above design criteria and not to make gratuitous changes
   to the v2 grammar.  Another way to say this is "we would rather
   encourage backward compatibility but not be constrained by it".
   Still, the goal of starting and editing a v3 document being easier
   than for a v2 document is more important than backwards compatibility
   with v2, given the latter two design criteria.

   v3 is upwards compatible with v2, meaning that a v2 document is meant
   to be a valid v3 document as well.  However, some features of v2 are
   deprecated in v3 in favor of new elements.  Deprecated features are
   listed in Section 1.2.3, and are described in [XML2RFCv2].

1.2.  Differences from v2 to v3

   The format changes in v3 are listed in the following subsections.

1.2.1.  New Elements in v3

   o  Add <dl>, <ul>, and <ol> as new ways to make lists.  This is a
      significant change from v2 in that the child under these elements
      is <li>, not <t>. <li> has a model of either containing one or
      more <t> elements, or containing the flowing text normally found
      in <t>.  These lists are children of <section>s instead of <t>.

   o  Add <strong>, <b>, <em>, <i>, <tt>, <sub>, and <sup> for character
      formatting.

   o  Add <aside> for incidental text that will be indented when
      displayed.

   o  Add <sourcecode> to differentiate from <artwork>.

   o  Add <table>, <thead>, <tbody>, <tfoot>, <tr>, <td>, and <th> to
      give table functionality like that in HTML.

   o  Add <blockquote> to indicate a quotation as in a paragraph-like
      format.

   o  Add <name> to sections, notes, figures, and texttables to allow
      character formatting (fixed-width font) in their titles, and to
      allow references.

   o  Add <postalLine>, free text that represents one line of the
      address.

   o  Add <displayreference> to allow display of more mneumonic anchor
      names for automatically-included references.




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   o  Add <refcontent> to allow better control of text in a reference.

   o  Add <referencegroup> to allow referemcing multi-RFC documents such
      as STDs and BCPs.

   o  Add <link> to point to a resource related to the RFC.

1.2.2.  New Attributes for Existing Elements

   o  Add "sortRefs", "symRefs", "tocDepth", and "tocInclude" attributes
      to <rfc> to cover processor instructions (PIs) that were in v2
      that are still needed in the grammar.

   o  Add "ascii" attributes to <author>, <email>, <organization>,
      <street>, <city>, <region> and <code>.  This allows an author to
      specify their information in their native scripts as the primary
      entry and still allow the ASCII-equivalent values to appear in the
      processed documents.

   o  Add "xml:lang" attribute to <artwork>, <postal>, and <author>.
      This is sometimes useful for renderers which display different
      fonts for ideographic characters used in China and Japan.

   o  Add the "section", "relative", and "sectionFormat" attributes to
      <xref>.

   o  Add the "numbered" and "removeinrfc" attributes to <section>.

   o  Add "boilerplateText", "figureNumber", "tableNumber", and
      "sectionNumber" attributes to <rfc>, <figure>, <table>, and
      <section>, respectively.

   o  Add "partNumber" to <artwork>, <artwork>, <aside>, <blockquote>,
      <li>, <sourcecode>, and <t> to hold automatically generated
      numbers for items in a section that don't have their own numbering
      (namely figures and tables).

1.2.3.  Elements and Attributes Deprecated from v2

   Deprecated elements and attributes are legacy vocabulary from v2 that
   are supported for input to v3 processors.  They are likely to be
   removed from those processors in the future.  Instead of being listed
   in Section 2, they are listed in in Section 3.  See Appendix B for
   more information on processors and how they will handle deprecated
   features.






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   o  Deprecate <list> in favor of <dl>, <ul>, and <ol>.

   o  Deprecate <spanx>; replace it with <strong>, <b>, <em>, <i>, and
      <tt>.

   o  Deprecate <vspace> because the major use for it, creating pseudo-
      paragraph-breaks in lists, is now handled properly.

   o  Deprecate <texttable>, <ttcol>, and <c>; replace them with the new
      table elements (<table> and the elements that can be contained
      within it).

   o  Deprecate <facsimile> because it is rarely used and is not
      actually useful; <email> is a much more useful way to get in touch
      with authors.

   o  Deprecate <format> because it is not useful and has caused
      surprise for authors in the past.  If the goal is to provide a
      single URI (Uniform Resource Identifier) for a reference, use the
      "target" attribute on <reference> instead.

   o  Deprecate <preamble> and <postamble> in favor of simply using <t>.
      This also deprecates the "align" attribute in <figure>.

   o  Deprecate the "title" attribute in <section>, <note>, <figure>,
      and <texttable> in favor of the new <name>.

   o  Deprecate the "alt", and "src" attributes in <figure> because they
      overlap with the attributes in <artwork>.

   o  Deprecate the "xml:space" attribute in <artwork> because there was
      only one useful value.  Deprecate "height" and "width" attribute
      in both <artwork> and <figure> because they are not needed for the
      new output formats.

   o  Deprecate the "pageno" attribute in <xref> because it was unused
      in v2.  Deprecate the "none" and "title" values for the "format"
      attribute in <xref> because the former makes no sense semantically
      and the latter because it has unpredictable output.

1.2.4.  Additional Changes from v2

   o  Allow non-ASCII characters in the format; the characters that are
      actually allowed will be determined by the RFC Editor.

   o  Allow <artwork> and <sourcecode> to be used on their own in
      <section> (no longer confine them to a figure).




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   o  Give more specifics of handling the "type" attribute in <artwork>.

   o  In <address>, allow the sub-elements to be in any order.

   o  Allow <strong>, <b>, <em>, <i>, <tt>, <eref>, and <xref> in
      <cref>.

   o  Allow the sub-elements inside a <reference> to be in any order.

   o  Turned off the auto-generation of anchors in <cref> because there
      is no use case for them that cannot be achieved in other ways.

   o  Allow more than one <artwork>, or more than one <sourcecode>, in
      <figure>.

   o  In <front>, make <date> optional.

   o  In <postal>, allow the sub-elements to be in any order.  Also
      allow the inclusion of the new <postalLine> instead of the older
      elements.

   o  In <section>, restricted the names of the anchors that can be used
      on some types of sections.

   o  <t> now only contains non-block elements, so it no longer contains
      <figure> elements.

   o  Do not generate the grammar from a DTD, but instead get it
      directly from the Relax Next Generation (RNG) grammar [RNG].

1.3.  Syntax Notation

   The XML vocabulary here is defined in prose, based on the Relax NG
   schema ([RNC]) contained in Appendix C (specified in Relax NG Compact
   Notation, "RNC").

   Note that the schema can be used for automated validity checks, but
   certain constraints are only described in prose (example: the
   conditionally required presence of the "abbrev" attribute).

2.  Elements

   The sections below describe all elements and their attributes.

   Note that attributes not labeled "mandatory" are optional.

   Many elements have an optional "anchor" attribute.  In all cases, the
   value of the "anchor" attribute needs to be a valid XML "Name"



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   (Section 2.3 of [XML]).  In short, it is a text string with no spaces
   or colons; hyphens, periods, and underscores are allowed; some
   characters cannot be in the first position (such as digits, hypen, or
   period).  Anchors are described in more detail in Appendix B.2.

   Except inside <artwork> and <sourcecode>, horizontal whitespace and
   linebreaks are collapsed into a single whitespace, and leading and
   trailing whitespace are trimmed off.

2.1.  <abstract>

   Contains the abstract of the document.  See [RFC7322] for more
   information on restrictions for the abstract.

   This element appears as a child element of: <front> (Section 2.25).

   Content model:

   One or more <t> elements (Section 2.52)

2.2.  <address>

   Provides address information for the author.

   This element appears as a child element of: <author> (Section 2.7).

   Content model:

   In any order:

   o  <email> elements (Section 2.22)

   o  <facsimile> elements (Section 3.2)

   o  <phone> elements (Section 2.36)

   o  <postal> elements (Section 2.37)

   o  <uri> elements (Section 2.63)

2.3.  <annotation>

   Provides additional prose augmenting a bibliographical reference.

   This element appears as a child element of: <reference>
   (Section 2.40).

   Content model:



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   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <spanx> elements (Section 3.7)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.3.1.  'ascii' attribute

   The ASCII equivalent of the annotation.

2.4.  <area>

   Provides information about the IETF area to which this document
   relates (currently not used when generating documents).

   The value ought to be either the full name or the abbreviation of one
   of the IETF areas as listed on <http://www.ietf.org/iesg/area.html>.
   The list at the time that this document is being published is:
   "Applications", "app", "General", "gen", "Internet", "int",
   "Operations and Management", "ops", "Real-time Applications and
   Infrastructure", "rai", "Routing", "rtg", "Security", "sec",
   "Transport", "tsv".

   This element appears as a child element of: <front> (Section 2.25).



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   Content model: only text content.

2.5.  <artwork>

   This element allows the inclusion of "artwork" into the document.

   <artwork> provides full control of horizontal whitespace and line
   breaks, and thus is used for a variety of things, such as:

   o  diagrams ("line art"),

   o  complex tables, or

   o  protocol unit diagrams.

   Alternatively, the "src" attribute allows referencing an external
   graphics file, such as a bitmap or a vector drawing, using a URI.  In
   this case, the textual content acts as fallback for output
   representations that do not support graphics, and thus ought to
   contain either a "line art" variant of the graphics, or otherwise
   prose that describes the included image in sufficient detail.

   If the artwork includes either "&" or "<" characters, or the string
   "]]>" those characters need to be encoded using escaping or CDATA
   block(s); see <sourcecode> for a fuller description of these
   solutions.

   In [XML2RFCv2], the <artwork> element was also used for source code
   and formal languages; in v3, this is now done with <sourcecode>.

   There are at least four ways to include SVG in artwork in Internet
   Drafts:

   o  Inline, by including all of the SVG in the content of the element
      (such as "<artwork type="svg"><svg xmlns...">")

   o  Inline, but using XInclude (see Appendix B.1 (such as "<artwork
      type="svg"><xi:include href=...")

   o  As a data: URI (such as "<artwork type="svg" src="data:image/
      svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3...">")

   o  As a URI to an external entity (such as "<artwork type="svg"
      src="http://www.example.com/...">")

   This element appears as a child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.11), <dd> (Section 2.17), <figure>
   (Section 2.24), <li> (Section 2.29), <section> (Section 2.45), <td>



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   (Section 2.55), and <th> (Section 2.57).

   Content model:

   Text

2.5.1.  'align' attribute

   Controls whether the artwork appears left justified (default),
   centered, or right justified.

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"

2.5.2.  'alt' attribute

   Alternative text description of the artwork (not just the caption).
   This is only used with artwork that is text-based; when the art comes
   from the "src" attribute, the alternative text comes from the text of
   the artwork itself.

2.5.3.  'anchor' attribute

   Document-wide unique identifier for this artwork.

2.5.4.  'height' attribute

   Deprecated.

2.5.5.  'name' attribute

   A filename suitable for the contents (such as for extraction to a
   local file).

   This attribute generally isn't used for document generation, but it
   can be helpful for other kinds of tools (such as automated syntax
   checkers which work by extracting the artwork).

2.5.6.  'partNumber' attribute

   The number for this artwork within the section.  The numbering is
   shared with other elements of a section.  This is described in more
   detail in Appendix B.2.



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2.5.7.  'src' attribute

   The URI reference of a graphics file ([RFC3986]).

   Note that this can be a "data" URI ([RFC2397]).

2.5.8.  'type' attribute

   Specifies the type of the artwork.  The value of this attribute is
   free text with certain values designated as preferred.  A private
   processor (as described in Appendix B) might add type-specific
   formatting to artwork with the preferred values.  If a processor
   encounters a value for "type" that is not one of the preferred
   values, it can issue a warning but should still use the artwork as if
   it had no "type" attribute.

   The preferred values for <artwork> types are:

   o  ascii-art

   o  call-flow

   o  hex-dump

   o  svg

   The RFC Editor will maintain a complete list of the preferred values
   on its web site, and that list is expected to be updated over time.
   Thus, a consumer of v3 XML should not cause a failure when it
   encounters an unexpected type.

2.5.9.  'width' attribute

   Deprecated.

2.5.10.  'xml:lang' attribute

   Allows specification of the language used.  This is sometimes useful
   for renderers which display different fonts for ideographic
   characters used in China and Japan.

2.5.11.  'xml:space' attribute

   Deprecated.







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2.6.  <aside>

   This element is a container for content that is semantically less
   important or tangential to the content that surrounds it.  The
   elements inside this container are indented from both margins when
   displayed.

   This element appears as a child element of: <section> (Section 2.45).

   Content model:

   In any order:

   o  <artwork> elements (Section 2.5)

   o  <figure> elements (Section 2.24)

   o  <iref> elements (Section 2.27)

   o  <sourcecode> elements (Section 2.47)

   o  <t> elements (Section 2.52)

   o  <texttable> elements (Section 3.8)

2.6.1.  'anchor' attribute

   Document-wide unique identifier for this aside.

2.6.2.  'partNumber' attribute

   The number for this aside within the section.  The numbering is
   shared with other elements of a section.  This is described in more
   detail in Appendix B.2.

2.7.  <author>

   Provides information about a document's author.  This is used both
   for the document itself (at the beginning of the document) and for
   referenced documents (inside of <reference>).

   The <author> elements contained within the document's <front> element
   are used to fill the boilerplate, and also to generate the "Author's
   Address" section (see [RFC7322]).

   Note that an "author" can also be just an organization (by not
   specifying any of the name attributes, but adding the <organization>
   child element).



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   Furthermore, the "role" attribute can be used to mark an author as
   "editor".  This is reflected both on the front page and in
   bibliographical references.  Note that this specification does not
   define a precise meaning for the term "editor".

   See Section "Authors vs. Contributors" of [RFCPOLICY] for more
   information.

   This element appears as a child element of: <front> (Section 2.25).

   Content model:

   In this order:

   1.  One optional <organization> element (Section 2.35)

   2.  One optional <address> element (Section 2.2)

2.7.1.  'ascii' attribute

   The ASCII equivalent of the author's full name.

2.7.2.  'fullname' attribute

   The full name (used in the automatically generated "Author's Address"
   section).

2.7.3.  'initials' attribute

   Author initials (used on the front page and in references).

   The value contains one or more initials, each followed by a period.
   Initials should be provided as a whitespace separated list of pairs
   of a letter and a dot.

2.7.4.  'role' attribute

   Specifies the role the author had in creating the document.

   Allowed values:

   o  "editor"

2.7.5.  'surname' attribute

   The author's surname (used on the front page and in references).





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2.7.6.  'xml:lang' attribute

   Allows specification of the language used.  This is sometimes useful
   for renderers which display different fonts for CJK characters.

2.8.  <b>

   Causes the text to be displayed in bold.  It is almost always a
   better idea to use the <strong> element instead.  This element can be
   combined with other character formatting elements, and the formatting
   will be additive.

   This element appears as a child element of: <annotation>
   (Section 2.3), <blockquote> (Section 2.11), <c> (Section 3.1), <cref>
   (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.26), <li> (Section 2.29), <postamble>
   (Section 3.5), <preamble> (Section 3.6), <refcontent> (Section 2.39),
   <sub> (Section 2.50), <sup> (Section 2.51), <t> (Section 2.52), <td>
   (Section 2.55), <th> (Section 2.57), and <tt> (Section 2.61).

   Content model:

   In any order:

   o  Text

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)






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2.9.  <back>

   Contains the "back" part of the document: the references and
   appendices.  In <back>, <section> elements indicate appendices.

   This element appears as a child element of: <rfc> (Section 2.44).

   Content model:

   In this order:

   1.  Optional <displayreference> elements (Section 2.18)

   2.  Optional <references> elements (Section 2.42)

   3.  Optional <section> elements (Section 2.45)

2.10.  <bcp14>

   Marks text that are phrases defined in BCP 14 such as "MUST", "SHOULD
   NOT", and so on.  When shown in some of the output representations,
   the text in this element might be highlighted.  The use of this
   element is optional.

   This element is only to be used around the actual phrase from BCP 14,
   not the full definition of a requirement.  For example, it is correct
   to say "The packet <bcp14>MUST</bcp14> be dropped.", but it not
   correct to say "<bcp14>The packet MUST be dropped.</bcp14>".

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <blockquote> (Section 2.11), <c>
   (Section 3.1), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.26), <li> (Section 2.29), <postamble>
   (Section 3.5), <preamble> (Section 3.6), <refcontent> (Section 2.39),
   <strong> (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51),
   <t> (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), and
   <tt> (Section 2.61).

   Content model: only text content.

2.11.  <blockquote>

   Specifies a block of text is a quotation.  The "cite" attribute is
   required, and must be a URI.

   This element appears as a child element of: <section> (Section 2.45).

   Content model:



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   In any order:

   o  Text

   o  <artwork> elements (Section 2.5)

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <em> elements (Section 2.21)

   o  <figure> elements (Section 2.24)

   o  <i> elements (Section 2.26)

   o  <sourcecode> elements (Section 2.47)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

2.11.1.  'anchor' attribute

   Document-wide unique identifier for this quotation.

2.11.2.  'cite' attribute (mandatory)

   The source of the citation.  This must be a URI.

2.11.3.  'partNumber' attribute

   The number for this blockquote within the section.  The numbering is
   shared with other elements of a section.  This is described in more
   detail in Appendix B.2.

2.12.  <city>

   Gives the city name in a postal address.

   This element appears as a child element of: <postal> (Section 2.37).

   Content model: only text content.




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2.12.1.  'ascii' attribute

   The ASCII equivalent of the city name.

2.13.  <code>

   Gives the postal region code.

   This element appears as a child element of: <postal> (Section 2.37).

   Content model: only text content.

2.13.1.  'ascii' attribute

   The ASCII equivalent of the postal code.

2.14.  <country>

   Gives the country in a postal address.

   This element appears as a child element of: <postal> (Section 2.37).

   Content model: only text content.

2.15.  <cref>

   Represents a comment.

   Comments can be used in a document while it is work-in-progress.
   They usually appear either inline and visually highlighted, at the
   end of the document (depending on file representation and settings of
   the processor), or not at all (when generating an RFC).

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <c> (Section 3.1), <dd>
   (Section 2.17), <dt> (Section 2.20), <em> (Section 2.21), <i>
   (Section 2.26), <li> (Section 2.29), <name> (Section 2.32),
   <postamble> (Section 3.5), <preamble> (Section 3.6), <strong>
   (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51), <t>
   (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), <tt>
   (Section 2.61), and <ttcol> (Section 3.9).

   Content model:

   In any order:

   o  Text




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   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.15.1.  'anchor' attribute

   Document-wide unique identifier for this comment.

2.15.2.  'source' attribute

   Holds the "source" of a comment, such as the name or the initials of
   the person who made the comment.

2.16.  <date>

   Provides information about the publication date.

   Note that this element is used both for the boilerplate of the
   document being produced, and also inside bibliographic references
   that use the <front> element.

   In the boilerplate case, it defines the date of publication for the
   current document (Internet Draft or RFC).  When producing Internet-
   Drafts, the Draft Processor uses this date to compute the expiration
   date (see [IDGUIDE]).  When one or more of "year", "month", or "day"
   are left out, the processor will attempt to use the current system
   date if the attributes that are present are consisten with that date.

   Also in the first case, that month names, if given, need to match the
   full English month name: "January", "February", "March", "April",
   "May, "June", "July", "August", "September", "October", "November",
   or "December".

   In the case of bibliographic references, the date information can



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   have prose text for the month or year.  For example, vague dates
   (year="ca. 2000"), date ranges (year="2012-2013"), non-specific
   months (month="Second quarter") and so on, are allowed.

   This element appears as a child element of: <front> (Section 2.25).

   Content model: this element does not have any contents.

2.16.1.  'day' attribute

   Day of publication; this is a number.

2.16.2.  'month' attribute

   Month of publication; this is the English name of the month.

2.16.3.  'year' attribute

   Year of publication.

2.17.  <dd>

   The definition part of an entry in a definition list.

   This element appears as a child element of: <dl> (Section 2.19).

   Content model:

   Either:

      One or more <t> elements (Section 2.52)

   Or:

      In any order, but at least one of:

      *  Text

      *  <artwork> elements (Section 2.5)

      *  <b> elements (Section 2.8)

      *  <bcp14> elements (Section 2.10)

      *  <cref> elements (Section 2.15)

      *  <dl> elements (Section 2.19)




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      *  <em> elements (Section 2.21)

      *  <eref> elements (Section 2.23)

      *  <figure> elements (Section 2.24)

      *  <i> elements (Section 2.26)

      *  <iref> elements (Section 2.27)

      *  <ol> elements (Section 2.34)

      *  <sourcecode> elements (Section 2.47)

      *  <strong> elements (Section 2.49)

      *  <sub> elements (Section 2.50)

      *  <sup> elements (Section 2.51)

      *  <tt> elements (Section 2.61)

      *  <ul> elements (Section 2.62)

      *  <xref> elements (Section 2.65)

2.18.  <displayreference>

   This element gives a mapping between the anchor of a reference and a
   name that will be displayed instead.  This allows authors to display
   more mneumonic anchor names for automatically-included references.
   For example, if the reference uses the anchor "RFC6949", the
   following would cause that anchor in the body of displayed documents
   to be "RFC-dev":

   <displayreference from="RFC6449" to="RFC-dev"/>

   This element appears as a child element of: <back> (Section 2.9).

   Content model: this element does not have any contents.

2.18.1.  'from' attribute (mandatory)

   This attribute must be the name of an anchor in a <reference>
   element.






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2.18.2.  'to' attribute (mandatory)

   This attribute is a name that will be displayed as the anchor instead
   of the anchor that is given in the <reference> element.  The string
   given must start with one of the following characters: 0-9, a-z, A-Z.
   The other characters in the string must be 0-9, a-z, A-Z, "-", ".",
   and "_".

2.19.  <dl>

   A definition list.  Each entry has a pair of elements: a term (<dt>)
   and a definition (<dd>).

   This element appears as a child element of: <dd> (Section 2.17), <li>
   (Section 2.29), <section> (Section 2.45), <td> (Section 2.55), and
   <th> (Section 2.57).

   Content model:

   One or more sequences of:

   1.  One <dt> element

   2.  One <dd> element

2.19.1.  'hanging' attribute

   The hanging attribute defines whether or not the term appears on the
   same line as the definition. hanging="false" indicates that the term
   is to the left of the definition, while hanging="true" indicates that
   the term will be on a separate line.

   Allowed values:

   o  "false" (default)

   o  "true"

2.19.2.  'spacing' attribute

   Defines whether or not there is a blank line between entries.
   spacing="normal" indicates a single blank line, while
   spacing="compact" indicates no space between.

   Allowed values:

   o  "normal" (default)




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   o  "compact"

2.20.  <dt>

   The term being defined in a definition list.

   This element appears as a child element of: <dl> (Section 2.19).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.21.  <em>

   Indicates text that is semantically empahsized.  This element will be
   displayed as italic after processing.  This element has the same
   effects as <i>.

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <blockquote> (Section 2.11), <c>
   (Section 3.1), <cref> (Section 2.15), <dd> (Section 2.17), <dt>
   (Section 2.20), <li> (Section 2.29), <postamble> (Section 3.5),



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   <preamble> (Section 3.6), <refcontent> (Section 2.39), <strong>
   (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51), <t>
   (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), and <tt>
   (Section 2.61).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.27)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.22.  <email>

   Provides an email address.

   The value is expected to be the scheme-specific part of a "mailto"
   URI (so does not include the prefix "mailto:").  See Section 2 of
   [RFC6068] for details.

   This element appears as a child element of: <address> (Section 2.2).

   Content model: only text content.

2.22.1.  'ascii' attribute

   The ASCII equivalent of the author's email address.  This is only
   used if the email address has one or two internationalized
   components.



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2.23.  <eref>

   Represents an "external" link (as specified in the "target"
   attribute).  This can be used for creating linked references, such as
   in HTML output.

   If the element has text content, that content will be used.
   Otherwise, the value of the target attribute will be inserted in
   angle brackets ([RFC3986], Appendix C).

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <c> (Section 3.1), <cref>
   (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.26), <li> (Section 2.29), <name>
   (Section 2.32), <postamble> (Section 3.5), <preamble> (Section 3.6),
   <strong> (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51),
   <t> (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), <tt>
   (Section 2.61), and <ttcol> (Section 3.9).

   Content model: only text content.

2.23.1.  'target' attribute (mandatory)

   URI of the link target (see Section 3 of [RFC3986]).

2.24.  <figure>

   Contains a figure with a caption with the figure number.  If the
   element contains a <name> element, the caption will also show that
   name.

   This element appears as a child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.11), <dd> (Section 2.17), <li>
   (Section 2.29), <section> (Section 2.45), <td> (Section 2.55), and
   <th> (Section 2.57).

   Content model:

   In this order:

   1.  One optional <name> element (Section 2.32)

   2.  Optional <iref> elements (Section 2.27)

   3.  One optional <preamble> element (Section 3.6)

   4.  In any order, but at least one of:




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       *  <artwork> elements (Section 2.5)

       *  <sourcecode> elements (Section 2.47)

   5.  One optional <postamble> element (Section 3.5)

2.24.1.  'align' attribute

   Deprecated.

   Note: does not affect title or <artwork> alignment.

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"

2.24.2.  'alt' attribute

   Deprecated.  If the goal is to provide a single URI for a reference,
   use the "target" attribute on <reference> instead.

2.24.3.  'anchor' attribute

   Document-wide unique identifier for this figure.

2.24.4.  'figureNumber' attribute

   The number for this figure.  This attribute and its value are
   automatically generated by the RFC Processor.  If the value already
   exists when the RFC Processor is run, it is replaced.

2.24.5.  'height' attribute

   Deprecated.

2.24.6.  'src' attribute

   Deprecated.

2.24.7.  'suppress-title' attribute

   Deprecated.  Figures always now get captions.

   Allowed values:



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   o  "true"

   o  "false" (default)

2.24.8.  'title' attribute

   Deprecated.  Use <name> instead.

2.24.9.  'width' attribute

   Deprecated.

2.25.  <front>

   Represent the "front matter": metadata (such as author information),
   abstract, and additional notes.

   This element appears as a child element of: <reference>
   (Section 2.40), and <rfc> (Section 2.44).

   Content model:

   In this order:

   1.  One <title> element (Section 2.59)

   2.  One or more <author> elements (Section 2.7)

   3.  One optional <date> element (Section 2.16)

   4.  Optional <area> elements (Section 2.4)

   5.  Optional <workgroup> elements (Section 2.64)

   6.  Optional <keyword> elements (Section 2.28)

   7.  One optional <abstract> element (Section 2.1)

   8.  Optional <note> elements (Section 2.33)

2.26.  <i>

   Causes the text to be displayed in italic.  It is almost always a
   better idea to use the <em> element instead.

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <blockquote> (Section 2.11), <c>
   (Section 3.1), <cref> (Section 2.15), <dd> (Section 2.17), <dt>



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   (Section 2.20), <li> (Section 2.29), <postamble> (Section 3.5),
   <preamble> (Section 3.6), <refcontent> (Section 2.39), <strong>
   (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51), <t>
   (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), and <tt>
   (Section 2.61).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.27)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.27.  <iref>

   Provides terms for the document's index.

   Index entries can be either single items (when just the "item"
   attribute is given) or nested items (by specifying "subitem" as
   well).

   This element appears as a child element of: <annotation>
   (Section 2.3), <aside> (Section 2.6), <b> (Section 2.8), <c>
   (Section 3.1), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <figure> (Section 2.24), <i> (Section 2.26), <li>
   (Section 2.29), <name> (Section 2.32), <postamble> (Section 3.5),
   <preamble> (Section 3.6), <section> (Section 2.45), <strong>
   (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51), <t>
   (Section 2.52), <table> (Section 2.53), <td> (Section 2.55), <th>



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   (Section 2.57), <tt> (Section 2.61), and <ttcol> (Section 3.9).

   Content model: this element does not have any contents.

2.27.1.  'item' attribute (mandatory)

   The item to include.

2.27.2.  'primary' attribute

   Setting this to "true" declares the occurrence as "primary", which
   might cause it to be highlighted in the index.

   Allowed values:

   o  "true"

   o  "false" (default)

2.27.3.  'subitem' attribute

   The subitem to include.

2.28.  <keyword>

   Specifies a keyword applicable to the document.

   Note that each element should only contain a single keyword; for
   multiple keywords, the element can simply be repeated.

   Keywords are used both in the RFC Index and in the metadata of
   generated document representations.

   This element appears as a child element of: <front> (Section 2.25).

   Content model: only text content.

2.29.  <li>

   A list element, used in <ol> and <ul>.

   This element appears as a child element of: <ol> (Section 2.34), and
   <ul> (Section 2.62).

   Content model:

   Either:




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      One or more <t> elements (Section 2.52)

   Or:

      In any order, but at least one of:

      *  Text

      *  <artwork> elements (Section 2.5)

      *  <b> elements (Section 2.8)

      *  <bcp14> elements (Section 2.10)

      *  <cref> elements (Section 2.15)

      *  <dl> elements (Section 2.19)

      *  <em> elements (Section 2.21)

      *  <eref> elements (Section 2.23)

      *  <figure> elements (Section 2.24)

      *  <i> elements (Section 2.26)

      *  <iref> elements (Section 2.27)

      *  <ol> elements (Section 2.34)

      *  <sourcecode> elements (Section 2.47)

      *  <strong> elements (Section 2.49)

      *  <sub> elements (Section 2.50)

      *  <sup> elements (Section 2.51)

      *  <tt> elements (Section 2.61)

      *  <ul> elements (Section 2.62)

      *  <xref> elements (Section 2.65)








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2.29.1.  'anchor' attribute

   Document-wide unique identifier for this list item.

2.29.2.  'partNumber' attribute

   The number for this list item within the section.  The numbering is
   shared with other elements of a section.  This is described in more
   detail in Appendix B.2.

2.30.  <link>

   A link to an external document that is related to the RFC.

   The following are the supported types of external documents that can
   be pointed to in a <link> element:

   o  The current ISSN for the RFC Series.  The value for the "rel"
      attribute is "isPartOf".  The link should use the form
      "urn:issn:".

   o  The DOI for this document.  The value for the "rel" attribute is
      "describedBy".  The link should use the form "doi:".

   o  The Internet Draft that was submitted to the RFC Editor to become
      the published RFC.  The value for the "rel" attribute is
      "convertedFrom".  The link should be to an IETF-controlled web
      site that retains copies of Internet Drafts.

   o  A representation of the document offered by the document author.
      The value for the "rel" attribute is "alternate".  The link can be
      to a personally-run web site.

   The RFC Processor needs to check the values for <link> before an RFC
   is published.  The Draft Processor might remove some <link> elements
   during the draft submission process.

   This element appears as a child element of: <rfc> (Section 2.44).

   Content model: this element does not have any contents.

2.30.1.  'href' attribute (mandatory)

   The URI of the external document.







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2.30.2.  'rel' attribute

   The relationship of the external document to this one.  The
   relationships are taken from Link Relations registry maintained by
   IANA [LINKRELATIONS].

2.31.  <middle>

   Represents the main content of the document.

   This element appears as a child element of: <rfc> (Section 2.44).

   Content model:

   One or more <section> elements (Section 2.45)

2.32.  <name>

   The name of the section, note, figure, or texttable.  This name can
   have flow markup such as to make some characters use a fixed-width
   font, or to include references.

   This element appears as a child element of: <figure> (Section 2.24),
   <note> (Section 2.33), <section> (Section 2.45), <table>
   (Section 2.53), and <texttable> (Section 3.8).

   Content model:

   In any order:

   o  Text

   o  <cref> elements (Section 2.15)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.27)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.32.1.  'slugifiedName' attribute

   This attribute is filled in by a processor with a "slugified" version
   of the text in the element.  This attribute can be used in the output
   formats for elements that have both names and numbers.




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2.33.  <note>

   Creates an unnumbered section that appears after the abstract.

   It is usually used for additional information to reviewers (working
   group information, mailing list, ...), or for additional publication
   information such as "IESG Notes".

   This element appears as a child element of: <front> (Section 2.25).

   Content model:

   In this order:

   1.  One optional <name> element (Section 2.32)

   2.  One or more <t> elements (Section 2.52)

2.33.1.  'title' attribute

   Deprecated.  Use <name> instead.

2.34.  <ol>

   An ordered list.  The labels on the items will be either a number or
   a letter, depending on the value of the style attribute.

   This element appears as a child element of: <dd> (Section 2.17), <li>
   (Section 2.29), <section> (Section 2.45), <t> (Section 2.52), <td>
   (Section 2.55), and <th> (Section 2.57).

   Content model:

   One or more <li> elements (Section 2.29)

2.34.1.  'group' attribute

   When a processor sees an <ol> element with a "group" attribute that
   has already been seen, the processor continues the numbering of the
   list from where the previous list with the same group name left off.
   If an <ol> element has both a "group" and "start" attribute, the
   group's numbering is reset to the given start value.

2.34.2.  'spacing' attribute

   Defines whether or not there is a blank line between entries.
   spacing="normal" indicates a single blank line, while
   spacing="compact" indicates no space between.



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   Allowed values:

   o  "normal" (default)

   o  "compact"

2.34.3.  'start' attribute

   The ordinal value to start the list at.  This defaults to "1", and
   must be an integer of 0 or greater.

2.34.4.  'style' attribute

   The style of the labels on list items.  If the length of the style
   value is 1, the meaning is the same as it is for HTML:

   a  Lowercase letters (a, b, c, ...)

   A  Uppercase letters (A, B, C, ...)

   1  Decimal numbers (1, 2, 3, ...)

   i  Lowercase Roman numerals (i, ii, iii, ...)

   I  Uppercase Roman numerals (I, II, III, ...)

   For style "a" and "A", after the 26th entry, the numbering starts at
   "aa"/"AA", then "ab"/"AB", and so on.

   If the length of the style value is greater than 1, the value must
   contain a percent-encoded indicator and other text.  The value is a
   free-form text that allows counter values to be inserted using a
   "percent-letter" format.  For instance, "[REQ%d]" generates labels of
   the form "[REQ1]", where "%d" inserts the item number as decimal
   number.

   The following formats are supported:

   %c Lowercase letters (a, b, c, ...)

   %C Uppercase letters (A, B, C, ...)

   %d Decimal numbers (1, 2, 3, ...)

   %i Lowercase Roman numerals (i, ii, iii, ...)






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   %I Uppercase Roman numerals (I, II, III, ...)

   %% Represents a percent sign

   Other formats are reserved for future use.

   It is an error for the style string to be empty, and processors will
   reject documents with an element that has such a style.  If the
   intention is to have a list that is indented without bullets or
   numbers, use <ul> with the 'empty="true"' attribute instead.

2.35.  <organization>

   Specifies the affiliation of an author.

   This information appears in both the "Author's Address" section and
   on the front page (see [RFC7322] for more information).  If the value
   is long, an abbreviated variant can be specified in the "abbrev"
   attribute.

   This element appears as a child element of: <author> (Section 2.7).

   Content model: only text content.

2.35.1.  'abbrev' attribute

   Abbreviated variant.

2.35.2.  'ascii' attribute

   The ASCII equivalent of the organization's name.

2.36.  <phone>

   Represents a phone number.

   The value is expected to be the scheme-specific part of a "tel" URI
   (so does not include the prefix "tel:"), using the "global numbers"
   syntax.  See Section 3 of [RFC3966] for details.

   This element appears as a child element of: <address> (Section 2.2).

   Content model: only text content.

2.37.  <postal>

   Contains optional child elements providing postal information.  These
   elements will be displayed in an order that is processor-specific.  A



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   postal address can contain only a set of <street>, <city>, <region>,
   <code>, and <country> elements, or only an ordered set of
   <postalLine> elements, but not both.

   This element appears as a child element of: <address> (Section 2.2).

   Content model:

   Either:

      In any order:

      *  <city> elements (Section 2.12)

      *  <code> elements (Section 2.13)

      *  <country> elements (Section 2.14)

      *  <region> elements (Section 2.43)

      *  <street> elements (Section 2.48)

   Or:

      One or more <postalLine> elements (Section 2.38)

2.37.1.  'xml:lang' attribute

   Allows specification of the language used.  This is sometimes useful
   for renderers which display different fonts for CJK characters.

2.38.  <postalLine>

   Represents one line of a postal address.  When more than one
   <postalLine> is given, the processor emits them in the order given.

   This element appears as a child element of: <postal> (Section 2.37).

   Content model: only text content.

2.38.1.  'ascii' attribute

   The ASCII equivalent of the text in the address line.

2.39.  <refcontent>

   Text that should appear between the title and the date of a
   reference.  The purpose of this element is to prevent the need to



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   abuse <seriesInfo> to get such text in a reference.

   For example:

   <reference anchor="April1">
     <front>
       <title>On Being A Fool</title>
       <author initials="K." surname="Phunny" fullname="Knot Phunny"/>
       <date year="2000" month="April"/>
     </front>
     <refcontent>Self-published pamphlet</refcontent>
   </reference>

   would render as:

      [April1]     Phunny, K., "On Being A Fool", Self-published
                   pamphlet, April 2000.

   This element appears as a child element of: <reference>
   (Section 2.40).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.26)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

2.39.1.  'ascii' attribute

   The ASCII equivalent of the added text.





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2.40.  <reference>

   Represents a bibliographical reference.

   This element appears as a child element of: <referencegroup>
   (Section 2.41), and <references> (Section 2.42).

   Content model:

   In this order:

   1.  One <front> element (Section 2.25)

   2.  In any order:

       *  <annotation> elements (Section 2.3)

       *  <format> elements (Section 3.3)

       *  <refcontent> elements (Section 2.39)

       *  <seriesInfo> elements (Section 2.46)

2.40.1.  'anchor' attribute (mandatory)

   Document-wide unique identifier for this reference.  Usually, this
   will be used both to "label" the reference in the references section,
   and as an identifier in links to this reference entry.

2.40.2.  'target' attribute

   Holds the URI for the reference.

   Note that depending on the <seriesInfo> element, a URI might not be
   needed, nor desirable, as it can be automatically generated (for
   instance, for RFCs).

2.41.  <referencegroup>

   Represents a list of bibliographic references that will be
   represented as a single reference.  This is most often used for
   references in the STD and BCP series, where a single reference (such
   as "BCP 9") encompasses more than one RFC.

   Content model:

   One or more <reference> elements (Section 2.40)




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2.41.1.  'anchor' attribute (mandatory)

   Document-wide unique identifier for this reference group.  Usually,
   this will be used both to "label" the reference group in the
   references section, and as an identifier in links to this reference
   entry.

2.42.  <references>

   Contains a set of bibliographical references.

   In the early days of the RFC series, there was only one "References"
   section per RFC.  This convention was later changed to group
   references into two sets, "Normative" and "Informative" as described
   in [RFC7322]).  This vocabulary supports the split with the "title"
   attribute.

   By default, the order of references is significant.  Processors,
   however, can be instructed to sort them based on their anchor names.

   This element appears as a child element of: <back> (Section 2.9).

   Content model:

   One or more <reference> elements (Section 2.40)

2.42.1.  'title' attribute

   Provides the title for the References section (defaulting to
   "References").

   In general, the title should be either "Normative References" or
   "Informative References".

2.43.  <region>

   Provides the region name in a postal address.

   This element appears as a child element of: <postal> (Section 2.37).

   Content model: only text content.

2.43.1.  'ascii' attribute

   The ASCII equivalent of the region name.






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2.44.  <rfc>

   This is the root element of the xml2rfc vocabulary.

   Processors distinguish between RFC mode ("number" attribute being
   present) and Internet-Draft mode ("docName" attribute being present):
   it is invalid to specify both.  Setting neither "number" nor
   "docName" can be useful for producing other types of document but is
   out-of-scope for this specification.

   Content model:

   In this order:

   1.  One optional <link> element (Section 2.30)

   2.  One <front> element (Section 2.25)

   3.  One <middle> element (Section 2.31)

   4.  One optional <back> element (Section 2.9)

2.44.1.  'boilerplateText' attribute

   The full boilerplate text for this document.  This attribute and its
   value are automatically generated by the RFC Processor, and are
   ignored by other processors.  If the value already exists when the
   RFC Processor is run, it is replaced.

2.44.2.  'category' attribute

   Document category (see Appendix A.1).

   Allowed values:

   o  "std"

   o  "bcp"

   o  "info"

   o  "exp"

   o  "historic"







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2.44.3.  'consensus' attribute

   Affects the generated boilerplate.

   See [RFC5741] for more information.

   Allowed values:

   o  "no"

   o  "yes"

2.44.4.  'docName' attribute

   Specifies the name or the Internet Draft or private document.  A
   private document is one whose representation is not meant to be an
   Internet Draft or RFC.  If the value for this attribute starts with
   the string "draft-", a processor treats the input as an Internet
   Draft; if the value starts with any other string, a processor treats
   this as a private document.  The name in the value should be the
   document name without any file extension.  That is, the value for
   this attribute should be "draft-ietf-somewg-someprotocol-07", not
   "draft-ietf-somewg-someprotocol-07.txt".

   A processor should give an error if both the "docName" and "number"
   attributes are given in the <rfc> element.

2.44.5.  'ipr' attribute

   Represents the Intellectual Property status of the document.  See
   Appendix A.2 for details.

   Allowed values:

   o  "full2026"

   o  "noDerivativeWorks2026"

   o  "none"

   o  "full3667"

   o  "noModification3667"

   o  "noDerivatives3667"

   o  "full3978"




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   o  "noModification3978"

   o  "noDerivatives3978"

   o  "trust200811"

   o  "noModificationTrust200811"

   o  "noDerivativesTrust200811"

   o  "trust200902"

   o  "noModificationTrust200902"

   o  "noDerivativesTrust200902"

   o  "pre5378Trust200902"

2.44.6.  'iprExtract' attribute

   Identifies a single section within the document for which extraction
   "as-is" is explicitly allowed (only relevant for historic values of
   the "ipr" attribute).

2.44.7.  'number' attribute

   The number of the RFC to be produced by a processor.

   A processor should give an error if both the "docName" and "number"
   attributes are given in the <rfc> element.

2.44.8.  'obsoletes' attribute

   A comma-separated list of RFC numbers or Internet-Draft names.

   Processors ought to parse the attribute value, so that incorrect
   references can be detected and, depending on output representation,
   hyperlinks can be generated.  Also, the value ought to be reformatted
   to insert whitespace after each comma if not already present.

2.44.9.  'seriesNo' attribute

   When producing a document within document series (such as "STD"): the
   number within that series.







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2.44.10.  'sortRefs' attribute

   Specifies whether or not a processor will sort the references in each
   reference section.

   Allowed values:

   o  "yes"

   o  "no" (default)

2.44.11.  'submissionType' attribute

   The document stream.

   See Section 2 of [RFC5741] for details.

   Allowed values:

   o  "IETF" (default)

   o  "IAB"

   o  "IRTF"

   o  "independent"

2.44.12.  'symRefs' attribute

   Specifies whether or not a processor will use symbolic references
   (such as "[RFC2119]").  If the value for this is "no", the references
   come out as numbers (such as "[3]").

   Allowed values:

   o  "yes" (default)

   o  "no"

2.44.13.  'tocDepth' attribute

   Specifies number of levels of heading for a processor to include in
   the table of contents; the default is "3".

2.44.14.  'tocInclude' attribute

   Specifies whether or not a processor will include a table of contents
   in generated files.



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   Allowed values:

   o  "yes" (default)

   o  "no"

2.44.15.  'updates' attribute

   A comma-separated list of RFC numbers or Internet-Draft names.

   Processors ought to parse the attribute value, so that incorrect
   references can be detected and, depending on output representation,
   hyperlinks can be generated.  Also, the value ought to be reformatted
   to insert whitespace after each comma if not already present.

2.44.16.  'xml:lang' attribute

   The natural language used in the document (defaults to "en").

   See Section 2.12 of [XML] for more information.

2.45.  <section>

   Represents a section (when inside a <middle> element) or an appendix
   (when inside a <back> element).

   Sub-sections are created by nesting <section> elements inside
   <section> elements.  Sections are allowed to be empty.

   This element appears as a child element of: <back> (Section 2.9),
   <middle> (Section 2.31), and <section> (Section 2.45).

   Content model:

   In this order:

   1.  One optional <name> element (Section 2.32)

   2.  In any order:

       *  <artwork> elements (Section 2.5)

       *  <aside> elements (Section 2.6)

       *  <blockquote> elements (Section 2.11)

       *  <dl> elements (Section 2.19)




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       *  <figure> elements (Section 2.24)

       *  <iref> elements (Section 2.27)

       *  <ol> elements (Section 2.34)

       *  <sourcecode> elements (Section 2.47)

       *  <t> elements (Section 2.52)

       *  <table> elements (Section 2.53)

       *  <texttable> elements (Section 3.8)

       *  <ul> elements (Section 2.62)

   3.  Optional <section> elements (Section 2.45)

2.45.1.  'anchor' attribute

   Document-wide unique identifier for this section.

2.45.2.  'numbered' attribute

   If set to "no", this section does not get a section number.
   Processors will verify that such a section is not followed by a
   numbered section in a part, and will verify that the section is a
   top-level section.

   Allowed values:

   o  "yes" (default)

   o  "no"

2.45.3.  'removeInRFC' attribute

   If set to "yes", this section is marked in the processor with text
   indicating that it should be removed before the document is published
   as an RFC.

   Allowed values:

   o  "yes"

   o  "no" (default)





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2.45.4.  'sectionNumber' attribute

   The number for this section, if one is generated by the processor.
   This attribute and its value are automatically generated by the RFC
   Processor, and are ignored by other processors.  If the value already
   exists when the RFC Processor is run, it is replaced.

2.45.5.  'title' attribute

   Deprecated.  Use <name> instead.

2.45.6.  'toc' attribute

   Indicates to a processor whether or not the section is to be included
   in the table of contents.  This only takes effect if the level of the
   section would have appeared in the table of contents based on the
   "tocDepth" attribute of the <rfc> element, and of course only if the
   table of contents is being created based on the "tocInclude"
   attribute of the <rfc> element.  If this is set to "exclude", any
   section below this one will be excluded as well.  The "default" value
   indicates to include the section if it would be included by the
   tocDepth attribute of the <rfc> element.

   Allowed values:

   o  "include"

   o  "exclude"

   o  "default" (default)

2.46.  <seriesInfo>

   Specifies the document series in which this document appears, and
   also specifies an identifier within that series.

   This element appears as a child element of: <reference>
   (Section 2.40).

   Content model: this element does not have any contents.

2.46.1.  'asciiname' attribute

   The ASCII equivalent of the name field.







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2.46.2.  'asciivalue' attribute

   The ASCII equivalent of the value field.

2.46.3.  'name' attribute (mandatory)

   The name of the series.

   The following names trigger specific processing (such as for auto-
   generating links, and adding descriptions such as "work in
   progress"): "BCP", "FYI", "Internet-Draft", "RFC", and "STD".

2.46.4.  'value' attribute (mandatory)

   The identifier within the series specified by the "name" attribute.

   For BCPs, FYIs, RFCs, and STDs this is the number within the series.
   For Internet-Drafts, it is the full draft name (ending with the two-
   digit version number).

2.47.  <sourcecode>

   This element allows the inclusion of sourcecode into the document.

   <sourcecode> provides full control of horizontal whitespace and line
   breaks.  It is thus useful for source code and formal languages (such
   as ABNF or the RNC notation used in this document).

   For artwork such as character-based art, diagrams of message layouts,
   and so on, use the <artwork> element instead.

   A common problem authors have with <sourcecode> is that the XML
   processor returns errors if the text in the artwork contains either
   the "&" or "<" character, or the string "]]>".  To avoid these
   problems, the "&" and "<" characters may be escaped using the strings
   "&amp;" and "&lt;", respectively; the "]]>" string can be represented
   as "]]&gt;".  Alternatively, they may be surrounded in a CDATA
   structure: "<![CDATA[]]>".  For example:













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   Desired output:
      allowed-chars = "." | "," | "&" | "<" | ">" | "|"

   Using escaping:
   <sourcecode>
      allowed-chars = "." | "," | "&amp;" | "&lt;" | "&gt;" | "|"
   </sourcecode>

   Using CDATA:
   <sourcecode>
   <![CDATA[   allowed-chars = "." | "," | "&" | "<" | ">" | "|"]]>
   </sourcecode>

   Using CDATA is not a panacea, but it does help prevent having to use
   escapes in places where using using escapes can cause other problems,
   such as difficulty of inclusion from other documents.

   This element appears as a child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.11), <dd> (Section 2.17), <figure>
   (Section 2.24), <li> (Section 2.29), <section> (Section 2.45), <td>
   (Section 2.55), and <th> (Section 2.57).

   Content model: only text content.

2.47.1.  'anchor' attribute

   Document-wide unique identifier for this sourcecode.

2.47.2.  'name' attribute

   A filename suitable for the contents (such as for extraction to a
   local file).  This attribute generally isn't used for document
   generation, but it can be helpful for other kinds of tools (such as
   automated syntax checkers which work by extracting the source code).

2.47.3.  'partNumber' attribute

   The number for this sourceode within the section.  The numbering is
   shared with other elements of a section.  This is described in more
   detail in Appendix B.2.

2.47.4.  'type' attribute

   Specifies the type of the sourcecode.  The value of this attribute is
   free text with certain values designated as preferred.  A private
   processor (as described in Appendix B) might add type-specific
   formatting to sourcecode with the preferred values.  If a processor
   encounters a value for "type" that is not one of the preferred



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   values, it can issue a warning but should still use the artwork as if
   it had no "type" attribute.

   The preferred values for <sourcecode> types are:

   o  abnf

   o  asn.1

   o  bash

   o  c++

   o  c

   o  cbor

   o  dtd

   o  java

   o  javascript

   o  json

   o  mib

   o  perl

   o  pseudocode

   o  python

   o  rnc

   o  xml

   The RFC Editor will maintain a complete list of the preferred values
   on its web site, and that list is expected to be updated over time.
   Thus, a consumer of v3 XML should not cause a failure when it
   encounters an unexpected type.

2.48.  <street>

   Provides a street address.

   This element appears as a child element of: <postal> (Section 2.37).




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   Content model: only text content.

2.48.1.  'ascii' attribute

   The ASCII equivalent of the street address.

2.49.  <strong>

   Indicates text that is semantically strong.  This element will be
   displayed as bold after processing.  This element has the same
   effects as <b>.  This element can be combined with other character
   formatting elements, and the formatting will be additive.

   This element appears as a child element of: <annotation>
   (Section 2.3), <blockquote> (Section 2.11), <c> (Section 3.1), <cref>
   (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.26), <li> (Section 2.29), <postamble>
   (Section 3.5), <preamble> (Section 3.6), <refcontent> (Section 2.39),
   <sub> (Section 2.50), <sup> (Section 2.51), <t> (Section 2.52), <td>
   (Section 2.55), <th> (Section 2.57), and <tt> (Section 2.61).

   Content model:

   In any order:

   o  Text

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)





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2.50.  <sub>

   Causes the text to be displayed as subscript, approximately half a
   letter-height lower than normal text.  This element can be combined
   with other character formatting elements, and the formatting will be
   additive.

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <blockquote> (Section 2.11), <c>
   (Section 3.1), <cref> (Section 2.15), <dd> (Section 2.17), <dt>
   (Section 2.20), <em> (Section 2.21), <i> (Section 2.26), <li>
   (Section 2.29), <postamble> (Section 3.5), <preamble> (Section 3.6),
   <refcontent> (Section 2.39), <strong> (Section 2.49), <t>
   (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), and <tt>
   (Section 2.61).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <strong> elements (Section 2.49)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.51.  <sup>

   Causes the text to be displayed as superscript, approximately half a
   letter-height higher than normal text.  This element can be combined
   with other character formatting elements, and the formatting will be
   additive.



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   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <blockquote> (Section 2.11), <c>
   (Section 3.1), <cref> (Section 2.15), <dd> (Section 2.17), <dt>
   (Section 2.20), <em> (Section 2.21), <i> (Section 2.26), <li>
   (Section 2.29), <postamble> (Section 3.5), <preamble> (Section 3.6),
   <refcontent> (Section 2.39), <strong> (Section 2.49), <t>
   (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), and <tt>
   (Section 2.61).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <strong> elements (Section 2.49)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

2.52.  <t>

   Contains a paragraph of text.

   This element appears as a child element of: <abstract> (Section 2.1),
   <aside> (Section 2.6), <dd> (Section 2.17), <li> (Section 2.29),
   <list> (Section 3.4), <note> (Section 2.33), <section>
   (Section 2.45), <td> (Section 2.55), and <th> (Section 2.57).

   Content model:

   In any order:




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   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <list> elements (Section 3.4)

   o  <ol> elements (Section 2.34)

   o  <spanx> elements (Section 3.7)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <vspace> elements (Section 3.10)

   o  <xref> elements (Section 2.65)

2.52.1.  'anchor' attribute

   Document-wide unique identifier for this paragraph.

2.52.2.  'hangText' attribute

   Deprecated.  Instead use <dd> inside of a definition list (<dl>).

2.52.3.  'partNumber' attribute

   The number for this paragraph within the section.  The numbering is
   shared with other elements of a section.  This is described in more
   detail in Appendix B.2.




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2.53.  <table>

   Contains a table with a caption with the table number.  If the
   element contains a <name> element, the caption will also show that
   name.

   Insde the <table> element is optionlly a <thead> element to contain
   the rows that will be the table's heading and optionally a <tfoot>
   element to contain the rows of the table's footer.  If the XML is
   converted to a representation that has page breaks (such as PDFs, or
   printed HTML), the header and footer are meant to appear on each
   page.

   This element appears as a child element of: <section> (Section 2.45).

   Content model:

   In this order:

   1.  One optional <name> element (Section 2.32)

   2.  Optional <iref> elements (Section 2.27)

   3.  One optional <thead> element (Section 2.58)

   4.  One or more <tbody> elements (Section 2.54)

   5.  One optional <tfoot> element (Section 2.56)

2.53.1.  'anchor' attribute

   Document-wide unique identifier for this table.

2.53.2.  'tableNumber' attribute

   The number for this table.  This attribute and its value are
   automatically generated by the RFC Processor.  If the value already
   exists when the RFC Processor is run, it is replaced.

2.54.  <tbody>

   A container for a set of body rows for a table.

   This element appears as a child element of: <table> (Section 2.53).

   Content model:

   One or more <tr> elements (Section 2.60)



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2.55.  <td>

   A cell in a table row.

   This element appears as a child element of: <tr> (Section 2.60).

   Content model:

   Either:

      One or more <t> elements (Section 2.52)

   Or:

      In any order, but at least one of:

      *  Text

      *  <artwork> elements (Section 2.5)

      *  <b> elements (Section 2.8)

      *  <bcp14> elements (Section 2.10)

      *  <cref> elements (Section 2.15)

      *  <dl> elements (Section 2.19)

      *  <em> elements (Section 2.21)

      *  <eref> elements (Section 2.23)

      *  <figure> elements (Section 2.24)

      *  <i> elements (Section 2.26)

      *  <iref> elements (Section 2.27)

      *  <ol> elements (Section 2.34)

      *  <sourcecode> elements (Section 2.47)

      *  <strong> elements (Section 2.49)

      *  <sub> elements (Section 2.50)

      *  <sup> elements (Section 2.51)




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      *  <tt> elements (Section 2.61)

      *  <ul> elements (Section 2.62)

      *  <xref> elements (Section 2.65)

2.55.1.  'border' attribute

   The width of the border for this cell.  The default is 0, meaning no
   border.

2.55.2.  'colspan' attribute

   The number of columns that the cell to span.  For example, setting
   "colspan='3'" indicates that the cell occupies the same horizontal
   space as three cells in the row above or below this one.

2.55.3.  'rowspan' attribute

   The number of rows that the cell to span.  For example, setting
   "rowspan='3'" indicates that the cell occupies the same vertical
   space as three rows.

2.56.  <tfoot>

   A container for a set of footer rows for a table.

   This element appears as a child element of: <table> (Section 2.53).

   Content model:

   One or more <tr> elements (Section 2.60)

2.57.  <th>

   A cell in a table row.  When rendered, this will normally come out in
   boldface; other than that, there is no difference between this and
   the td> element.

   This element appears as a child element of: <tr> (Section 2.60).

   Content model:

   Either:

      One or more <t> elements (Section 2.52)

   Or:



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      In any order, but at least one of:

      *  Text

      *  <artwork> elements (Section 2.5)

      *  <b> elements (Section 2.8)

      *  <bcp14> elements (Section 2.10)

      *  <cref> elements (Section 2.15)

      *  <dl> elements (Section 2.19)

      *  <em> elements (Section 2.21)

      *  <eref> elements (Section 2.23)

      *  <figure> elements (Section 2.24)

      *  <i> elements (Section 2.26)

      *  <iref> elements (Section 2.27)

      *  <ol> elements (Section 2.34)

      *  <sourcecode> elements (Section 2.47)

      *  <strong> elements (Section 2.49)

      *  <sub> elements (Section 2.50)

      *  <sup> elements (Section 2.51)

      *  <tt> elements (Section 2.61)

      *  <ul> elements (Section 2.62)

      *  <xref> elements (Section 2.65)

2.57.1.  'border' attribute

   The width of the border for this cell.  The default is 0, meaning no
   border.







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2.57.2.  'colspan' attribute

   The number of columns that the cell to span.  For example, setting
   "colspan='3'" indicates that the cell occupies the same horizontal
   space as three cells in the row above or below this one.

2.57.3.  'rowspan' attribute

   The number of rows that the cell to span.  For example, setting
   "rowspan='3'" indicates that the cell occupies the same vertical
   space as three rows.

2.58.  <thead>

   A container for a set of header rows for a table.

   This element appears as a child element of: <table> (Section 2.53).

   Content model:

   One or more <tr> elements (Section 2.60)

2.59.  <title>

   Represents the document title.

   When this element appears in the <front> element of the current
   document, the title might also appear in page headers or footers.  If
   it is long (~40 characters), the "abbrev" attribute is used to
   specify an abbreviated variant.

   This element appears as a child element of: <front> (Section 2.25).

   Content model: only text content.

2.59.1.  'abbrev' attribute

   Specifies an abbreviated variant of the document title.

2.59.2.  'ascii' attribute

   The ASCII equivalent of the title.

2.60.  <tr>

   A row of a table.

   This element appears as a child element of: <tbody> (Section 2.54),



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   <tfoot> (Section 2.56), and <thead> (Section 2.58).

   Content model:

   One or more sequences of:

   1.  One <td> element

   2.  One <th> element

2.60.1.  'border' attribute

   The width of the border for this row.  The default is 0, meaning no
   border.  If the cells in this row also have "border" attributes,
   those values override this value for those cells.

2.61.  <tt>

   Causes the text to be displayed in a constant-width font.  This
   element can be combined with other character formatting elements, and
   the formatting will be additive.

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <blockquote> (Section 2.11), <c>
   (Section 3.1), <cref> (Section 2.15), <dd> (Section 2.17), <dt>
   (Section 2.20), <em> (Section 2.21), <i> (Section 2.26), <li>
   (Section 2.29), <name> (Section 2.32), <postamble> (Section 3.5),
   <preamble> (Section 3.6), <refcontent> (Section 2.39), <strong>
   (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51), <t>
   (Section 2.52), <td> (Section 2.55), and <th> (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)





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   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <xref> elements (Section 2.65)

2.62.  <ul>

   An unordered list.  The labels on the items will be symbols picked by
   the processor.

   This element appears as a child element of: <dd> (Section 2.17), <li>
   (Section 2.29), <section> (Section 2.45), <td> (Section 2.55), and
   <th> (Section 2.57).

   Content model:

   One or more <li> elements (Section 2.29)

2.62.1.  'empty' attribute

   Defines whether or not the label is empty. empty="true" indicates
   that no label be shown.

   Allowed values:

   o  "false" (default)

   o  "true"

2.62.2.  'spacing' attribute

   Defines whether or not there is a blank line between entries.
   spacing="normal" indicates a single blank line, while
   spacing="compact" indicates no space between.

   Allowed values:

   o  "normal" (default)

   o  "compact"




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2.63.  <uri>

   Contains a web address associated with the author.

   The contents should be a valid URI (see Section 3 of [RFC3986]).

   This element appears as a child element of: <address> (Section 2.2).

   Content model: only text content.

2.64.  <workgroup>

   This element is used to specify the Working Group (IETF) or Research
   Group (IRTF) from which the document originates, if any.  The
   recommended format is the official name of the Working Group (with
   some capitalization).

   In Internet-Drafts, this is used in the upper left corner of the
   boilerplate, replacing the "Network Working Group" string.
   Formatting software can append the words "Working Group" or "Research
   Group", depending on the "submissionType" property on the <rfc>
   element (Section 2.44.11).

   This element appears as a child element of: <front> (Section 2.25).

   Content model: only text content.

2.65.  <xref>

   Inserts a reference to a different part of a document.

   The generated text depends on whether the <xref> is empty (in which
   case the processor will try to generate a meaningful text fragment),
   and the nature of the referenced document part. [[anchor6: Need to
   say more about the processor output if the element is empty and if it
   has text.]]

   Any element that allows the "anchor" attribute can be referenced;
   however, there are restrictions with respect to the text content
   being generated.  For instance, a <t> can be a reference target,
   however, because paragraphs are not (visibly) numbered, the author
   will have to make sure that the prose is sufficient for a reader to
   understand what is being referred to.

   This element appears as a child element of: <annotation>
   (Section 2.3), <b> (Section 2.8), <c> (Section 3.1), <cref>
   (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.26), <li> (Section 2.29), <name>



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   (Section 2.32), <postamble> (Section 3.5), <preamble> (Section 3.6),
   <strong> (Section 2.49), <sub> (Section 2.50), <sup> (Section 2.51),
   <t> (Section 2.52), <td> (Section 2.55), <th> (Section 2.57), <tt>
   (Section 2.61), and <ttcol> (Section 3.9).

   Content model: only text content.

2.65.1.  'format' attribute

   This attribute is used to control the format of the generated
   reference text.

   "counter"

      Inserts just a counter; this is used for the number of a section,
      figure, or table.  For example:

     <section anchor="overview">Protocol Overview</section>
     . . .
     See Section <xref target="overview" format="counter"/>
     for an overview.

      might generate

     See Section 1.7 for an overview.

   "default"

      Inserts a text fragment that describes the referenced part
      completely, such as "Section 2" or "Table 4" for internal links,
      or "[XML]" for links to references.  For example:

     <section anchor="overview">Protocol Overview</section>
     . . .
     See <xref target="overview"/> for an overview.

      might generate

     See Section 1.7 for an overview.

   "none"

      There will be no auto-generated text.  This is useful for creating
      a link that will appear in the processed text.

   "title"





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      Inserts a title for the referenced element (usually obtained from
      the referenced element's "title" attribute; some processors also
      use the <title> child element or a <reference> target).

   Allowed values:

   o  "counter"

   o  "title"

   o  "none"

   o  "default" (default)

2.65.2.  'pageno' attribute

   Deprecated.

   Allowed values:

   o  "true"

   o  "false" (default)

2.65.3.  'relative' attribute

   Specifies a relative reference from the main target. [[anchor7: Need
   more description here about how this will be rendered by a
   processor.]]

2.65.4.  'section' attribute

   Specifies a section for the generated reference.  For example,

        See <xref section="2.3" target="RFC6949"/> for more information.

   would generate

        See Section 2.3 of [RFC6949] for more information.

2.65.5.  'sectionFormat' attribute

   The format that the section reference will be displayed in.  The
   acceptable values are:

   o  "of" (default)





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   o  "comma"

   o  "parens"

   For example:

     See <xref target="RFC6949" section="2.3" sectionFormat="of"/>
     for more information.
     See <xref target="RFC6949" section="2.4" sectionFormat="comma"/>
     for more information.
     See <xref target="RFC6949" section="2.5" sectionFormat="parens"/>
     for more information.

   would generate

        See Section 2.3 of [RFC6949] for more information.
        See [RFC6949], Section 2.4 for more information.
        See [RFC6949] (Section 2.5) for more information.

2.65.6.  'target' attribute (mandatory)

   Identifies the document component being referenced.

   The value needs to match the value of the "anchor" attribute of
   another element in the document.

3.  Elements from v2 That Have Been Deprecated

   This section lists the elements from v2 that have been deprecated.
   Note that some elements in v3 have attributes from v2 that are
   deprecated; those are not listed here.

3.1.  <c>

   Deprecated.  Instead, use <tr>, <td>, and <th>.

   This element appears as a child element of: <texttable>
   (Section 3.8).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)





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   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <spanx> elements (Section 3.7)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

3.2.  <facsimile>

   Deprecated.  The <email> element is a much more useful way to get in
   touch with authors.

   This element appears as a child element of: <address> (Section 2.2).

   Content model: only text content.

3.3.  <format>

   Deprecated.  If the goal is to provide a single URI for a reference,
   use the "target" attribute on <reference> instead.

   This element appears as a child element of: <reference>
   (Section 2.40).

   Content model: this element does not have any contents.

3.3.1.  'octets' attribute

   Deprecated.





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3.3.2.  'target' attribute

   Deprecated.

3.3.3.  'type' attribute (mandatory)

   Deprecated.

3.4.  <list>

   Deprecated.  Instead, use <dl> for list/@style "hanging"; <ul> for
   list/@style "empty" or "symbols"; and <ol> for list/@style "letters",
   "numbers", "counter", or "format".

   This element appears as a child element of: <t> (Section 2.52).

   Content model:

   One or more <t> elements (Section 2.52)

3.4.1.  'counter' attribute

   Deprecated.  The functionality of this attribute has been replaced
   with <ol>/@start.

3.4.2.  'hangIndent' attribute

   Deprecated.  Use <dl> instead.

3.4.3.  'style' attribute

   Deprecated.

3.5.  <postamble>

   Deprecated.  Instead, use a regular paragraph after the figure or
   table.

   This element appears as a child element of: <figure> (Section 2.24),
   and <texttable> (Section 3.8).

   Content model:

   In any order:

   o  Text





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   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)

   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <spanx> elements (Section 3.7)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

3.6.  <preamble>

   Deprecated.  Instead, use a regular paragraph before the figure or
   table.

   This element appears as a child element of: <figure> (Section 2.24),
   and <texttable> (Section 3.8).

   Content model:

   In any order:

   o  Text

   o  <b> elements (Section 2.8)

   o  <bcp14> elements (Section 2.10)

   o  <cref> elements (Section 2.15)

   o  <em> elements (Section 2.21)




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   o  <eref> elements (Section 2.23)

   o  <i> elements (Section 2.26)

   o  <iref> elements (Section 2.27)

   o  <spanx> elements (Section 3.7)

   o  <strong> elements (Section 2.49)

   o  <sub> elements (Section 2.50)

   o  <sup> elements (Section 2.51)

   o  <tt> elements (Section 2.61)

   o  <xref> elements (Section 2.65)

3.7.  <spanx>

   Deprecated.

   This element appears as a child element of: <annotation>
   (Section 2.3), <c> (Section 3.1), <postamble> (Section 3.5),
   <preamble> (Section 3.6), and <t> (Section 2.52).

   Content model: only text content.

3.7.1.  'style' attribute

   Deprecated.  Instead of <spanx style="emph">, use <b> instead of
   <spanx style="strong">, use <i>; instead of <spanx style="verg">, use
   <tt>.

3.7.2.  'xml:space' attribute

   Deprecated.

   Allowed values:

   o  "default"

   o  "preserve" (default)








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3.8.  <texttable>

   Deprecated.  Use <table> instead.

   This element appears as a child element of: <aside> (Section 2.6),
   and <section> (Section 2.45).

   Content model:

   In this order:

   1.  One optional <name> element (Section 2.32)

   2.  One optional <preamble> element (Section 3.6)

   3.  One or more <ttcol> elements (Section 3.9)

   4.  Optional <c> elements (Section 3.1)

   5.  One optional <postamble> element (Section 3.5)

3.8.1.  'align' attribute

   Deprecated

   Allowed values:

   o  "left"

   o  "center" (default)

   o  "right"

3.8.2.  'anchor' attribute

   Deprecated

3.8.3.  'style' attribute

   Deprecated.

3.8.4.  'suppress-title' attribute

   Deprecated.

   Allowed values:





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   o  "true"

   o  "false" (default)

3.8.5.  'title' attribute

   Deprecated.

3.9.  <ttcol>

   Deprecated.  Instead, use <tr>, <td>, and <th>.

   This element appears as a child element of: <texttable>
   (Section 3.8).

   Content model:

   In any order:

   o  <cref> elements (Section 2.15)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.27)

   o  <xref> elements (Section 2.65)

   o  Text

3.9.1.  'align' attribute

   Deprecated.

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"

3.9.2.  'width' attribute

   Deprecated.







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3.10.  <vspace>

   Deprecated.  In earlier versions of this format, <vspace> was often
   used to get an extra blank line in a list element; in the v3
   vocabulary, that can be done instead by using multiple <t> elements
   inside the <li> element.  Other uses have no direct replacement.

   This element appears as a child element of: <t> (Section 2.52).

   Content model: this element does not have any contents.

3.10.1.  'blankLines' attribute

   Deprecated.

4.  Internationalization Considerations

   This format is based on [XML], thus does not have any issues
   representing arbitrary Unicode [UNICODE] characters in text content.
   The RFC Editor may restrict some of the characters that can be used
   in a particular RFC; the rules for such restrictions are covered in
   [NONASCII].

5.  Security Considerations

   The "name" attribute on the <artwork> element (Section 2.5.5) can be
   used to derive a filename for saving to a local file system.
   Trusting this kind of information without pre-processing is a known
   security risk; see Section 4.3 of [RFC6266] for more information.

   The "type" attribute of the <artwork> and <sourcecode> elements is
   meant to encourage processors to automatically extract known types of
   content from an RFC or Internet Draft.  While extraction is probably
   safe, those processors might also think that they could further
   process the extracted content such as by rendering artwork or
   executing code.  Doing so without first sanity-checking the extracted
   content is clearly a terrible idea from a security perspective.  More
   generally, a processor that is reading RFCs or Internet Drafts needs
   to be suspicious of any content that it intends to post-process.

   All security considerations related to XML processing are relevant as
   well (see Section 7 of [RFC3470]).

6.  IANA Considerations







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6.1.  Internet Media Type Registration

   IANA maintains the registry of Internet media types [BCP13] at
   <http://www.iana.org/assignments/media-types>.

   This document updates the specification for the Internet media type
   "application/rfc+xml" from the one in [XML2RFCv2].  The following is
   to be registered with IANA.

   Type name:  application

   Subtype name:  rfc+xml

   Required parameters:  There are no required parameters.

   Optional parameters:  "charset": This parameter has identical
      semantics as the charset parameter of the "application/xml" media
      type specified in Section 9.1 of [RFC7303].

   Encoding considerations:  Identical to those of "application/xml" as
      described in Section 9.1 of [RFC7303].

   Security considerations:  As defined in Section 5.  In addition, as
      this media type uses the "+xml" convention, it inherits the
      security considerations described in Section 10 of [RFC7303].

   Interoperability considerations:  N/A

   Published specification:  This specification.

   Applications that use this media type:  Applications that transform
      xml2rfc to output representations such as plain text or HTML, plus
      additional analysis tools.

   Fragment identifier considerations:  The "anchor" attribute is used
      for assigning document-wide unique identifiers that can be used as
      shorthand pointers, as described in Section 2.8 of [XPOINTER].

   Additional information:

      Deprecated alias names for this type:  None.

      Magic number(s):  As specified for "application/xml" in Section
         9.1 of [RFC7303].







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      File extension(s):  .xml or .rfcxml when disambiguation from other
         XML files is needed

      Macintosh file type code(s):  TEXT

   Person & email address to contact for further information:  See
      Authors Section.

   Intended usage:  COMMON

   Restrictions on usage:  N/A

   Author:  See Authors Section.

   Change controller:  RFC Series Editor (rse@rfc-editor.org)

6.2.  Link Relation Registration

   The following is a proposed addition to [LINKRELATIONS].

   Relation Name: convertedFrom

   Description: The document linked to was later converted to the
   document that contains this link relation.  For example, an RFC can
   have a link to the Internet Draft that became the RFC; in that case,
   the link relation would be "convertedFrom".

   Reference: This document.

   Notes: This relation is different than "predecessor-version" in that
   "predecessor-version" is for items in a version control system.  It
   is also different that "previous" in that this relation is used for
   converted resources, not those that are part of a sequence of
   resources.

   Application Data: none

7.  Acknowledgments

   Thanks to everybody who reviewed this document and provided feedback
   and/or specification text.  Thanks especially go to Julian Reschke
   for editing [XML2RFCv2] and those who provided feedback on that
   document.

   We also thank Marshall T. Rose for both the original design and the
   reference implementation of the "xml2rfc" processor.

8.  References



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8.1.  Normative References

   [XML]            Maler, E., Yergeau, F., Paoli, J., Sperberg-McQueen,
                    M., and T. Bray, "Extensible Markup Language (XML)
                    1.0 (Fifth Edition)", W3C Recommendation REC-xml-
                    20081126, November 2008,
                    <http://www.w3.org/TR/2008/REC-xml-20081126/>.

                    Latest version available at
                    <http://www.w3.org/TR/xml>.

   [XML2RFCv2]      Reschke, J., "The 'XML2RFC' version 2 Vocabulary",
                    draft-reschke-xml2rfc (work in progress), 2014.

8.2.  Informative References

   [BCP13]          Freed, N., Klensin, J., and T. Hansen, "Media Type
                    Specifications and Registration Procedures", BCP 13,
                    RFC 6838, January 2013.

   [IDGUIDE]        Housley, R., "Guidelines to Authors of Internet-
                    Drafts",
                    <http://www.ietf.org/id-info/guidelines.html>.

   [LINKRELATIONS]  IANA, "Link Relations", <http://www.iana.org/
                    assignments/link-relations/link-relations.xhtml>.

   [NONASCII]       Flanagan, H., "The Use of Non-ASCII Characters in
                    RFCs", draft-flanagan-nonascii (work in progress),
                    2014.

   [RFC2026]        Bradner, S., "The Internet Standards Process --
                    Revision 3", BCP 9, RFC 2026, October 1996.

   [RFC2397]        Masinter, L., "The "data" URL scheme", RFC 2397,
                    August 1998.

   [RFC2629]        Rose, M., "Writing I-Ds and RFCs using XML",
                    RFC 2629, June 1999.

   [RFC3470]        Hollenbeck, S., Rose, M., and L. Masinter,
                    "Guidelines for the Use of Extensible Markup
                    Language (XML) within IETF Protocols", BCP 70,
                    RFC 3470, January 2003.

   [RFC3966]        Schulzrinne, H., "The tel URI for Telephone
                    Numbers", RFC 3966, December 2004.




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   [RFC3986]        Berners-Lee, T., Fielding, R., and L. Masinter,
                    "Uniform Resource Identifier (URI): Generic Syntax",
                    STD 66, RFC 3986, January 2005.

   [RFC5741]        Daigle, L. and O. Kolkman, "RFC Streams, Headers,
                    and Boilerplates", RFC 5741, December 2009.

   [RFC6068]        Duerst, M., Masinter, L., and J. Zawinski, "The
                    'mailto' URI Scheme", RFC 6068, October 2010.

   [RFC6266]        Reschke, J., "Use of the Content-Disposition Header
                    Field in the Hypertext Transfer Protocol (HTTP)",
                    RFC 6266, June 2011.

   [RFC6949]        Flanagan, H. and N. Brownlee, "RFC Series Format
                    Requirements and Future Development", RFC 6949,
                    May 2013.

   [RFC7303]        Thompson, H. and C. Lilley, "XML Media Types",
                    RFC 7303, July 2014.

   [RFC7322]        Heather, H. and S. Ginoza, "RFC Style Guide",
                    RFC 7322, September 2014.

   [RFCPOLICY]      RFC Editor, "RFC Editorial Guidelines and
                    Procedures",
                    <http://www.rfc-editor.org/policy.html>.

   [RNC]            Clark, J., "RELAX NG Compact Syntax", OASIS ,
                    November 2002, <http://www.oasis-open.org/
                    committees/relax-ng/compact-20021121.html>.

   [RNG]            ISO/IEC, "Information Technology - Document Schema
                    Definition Languages (DSDL) - Part 2: Regular-
                    Grammar-Based Validation - RELAX NG. Second
                    Edition.", ISO/IEC 19757-2:2008(E), December 2008.

                    A useful source of RNG-related information is
                    <http://relaxng.org/>.

   [TLP2.0]         IETF Trust, "Legal Provisions Relating to IETF
                    Documents", February 2009, <http://trustee.ietf.org/
                    license-info/IETF-TLP-2.htm>.

   [TLP3.0]         IETF Trust, "Legal Provisions Relating to IETF
                    Documents", September 2009, <http://
                    trustee.ietf.org/license-info/IETF-TLP-3.htm>.




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   [TLP4.0]         IETF Trust, "Legal Provisions Relating to IETF
                    Documents", December 2009, <http://trustee.ietf.org/
                    license-info/IETF-TLP-4.htm>.

   [UNICODE]        The Unicode Consortium, "The Unicode Standard,
                    Version 6.3.0", September 2013,
                    <http://www.unicode.org/versions/Unicode6.3.0/>.

   [XInclude]       Marsh, J., Orchard, D., and D. Veillard, "XML
                    Inclusions (XInclude) Version 1.0 (Second Edition)",
                    W3C Recommendation REC-xinclude-20061115,
                    November 2006, <http://www.w3.org/TR/xinclude/>.

                    Latest version available at
                    <http://www.w3.org/TR/xinclude/>.

   [XPOINTER]       Grosso, P., Maler, E., Marsh, J., and N. Walsh,
                    "XPointer Framework", W3C Recommendation REC-xptr-
                    framework-20030325, March 2003, <http://www.w3.org/
                    TR/2003/REC-xptr-framework-20030325/>.

                    Latest version available at
                    <http://www.w3.org/TR/xptr-framework/>.

Appendix A.  Front Page Generation

A.1.  The /rfc/@category Attribute

   For RFCs, the category determines the "maturity level" (see Section 4
   of [RFC2026]).  The allowed values are "std" for "Standards Track",
   "bcp" for "BCP", "info" for "Informational", "exp" for
   "Experimental", and "historic" for "Historic".

   For Internet-Drafts, the category attribute is not needed, but will
   appear on the front page as "Intended Status".  Supplying this
   information can be useful to reviewers.

A.2.  The /rfc/@ipr Attribute

   This attribute value can take a long list of values, each of which
   describes an IPR policy for the document.  This attribute's values
   are not the result of a grand plan, but remain simply for historic
   reasons.  Of these values, only a few are currently in use; all
   others are supported by the various tools for backwards compatibility
   with old source files.






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      Note: some variations of the boilerplate are selected based on the
      document's date; therefore it is important to specify the "year",
      "month" and "day" attributes of the <date> element when archiving
      the XML source of an Internet-Draft on the day of submission.

   Disclaimer: THIS ONLY PROVIDES IMPLEMENTATION INFORMATION.  IF YOU
   NEED LEGAL ADVICE, PLEASE CONTACT A LAWYER.  For further information,
   refer to <http://trustee.ietf.org/docs/IETF-Copyright-FAQ.pdf>.

   For the current "Status Of This Memo" text, the submissionType
   attribute determines whether a statement about "Code Components" is
   inserted (which is the case for the value "IETF", which is the
   default).  Other values, such as "independent", suppress this part of
   the text.

A.2.1.  Current Values: '*trust200902'

   The name for these values refers to the "IETF TRUST Legal Provisions
   Relating to IETF Documents", sometimes simply called the "TLP, that
   went into effect on February 15, 2009 ([TLP2.0]).  Updates to this
   document were published on September 12, 2009 ([TLP3.0]) and on
   December 28, 2009 ([TLP4.0]), modifying the license for code
   components (see <http://trustee.ietf.org/license-info/> for further
   information).  The actual text is located in Section 6 ("Text To Be
   Included in IETF Documents") of these documents.

   The tools will automatically produce the "correct" text depending on
   the document's date information (see above):

   +----------+--------------------------------+
   | TLP      | starting with publication date |
   +----------+--------------------------------+
   | [TLP3.0] | 2009-11-01                     |
   | [TLP4.0] | 2010-04-01                     |
   +----------+--------------------------------+

A.2.1.1.  trust200902

   This should be the default, unless one of the more specific
   '*trust200902' values is a better fit.  It produces the text in
   Sections 6.a and 6.b of the TLP.

A.2.1.2.  noModificationTrust200902

   This produces additional text from Section 6.c.i of the TLP:






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      This document may not be modified, and derivative works of it may
      not be created, except to format it for publication as an RFC or
      to translate it into languages other than English.

      Note: this clause is incompatible with RFCs that are published on
      the Standards Track.

A.2.1.3.  noDerivativesTrust200902

   This produces the additional text from Section 6.c.ii of the TLP:

      This document may not be modified, and derivative works of it may
      not be created, and it may not be published except as an Internet-
      Draft.

      Note: this clause is incompatible with RFCs.

A.2.1.4.  pre5378Trust200902

   This produces the additional text from Section 6.c.iii of the TLP,
   frequently called the "pre-5378 escape clause":

      This document may contain material from IETF Documents or IETF
      Contributions published or made publicly available before November
      10, 2008.  The person(s) controlling the copyright in some of this
      material may not have granted the IETF Trust the right to allow
      modifications of such material outside the IETF Standards Process.
      Without obtaining an adequate license from the person(s)
      controlling the copyright in such materials, this document may not
      be modified outside the IETF Standards Process, and derivative
      works of it may not be created outside the IETF Standards Process,
      except to format it for publication as an RFC or to translate it
      into languages other than English.

   See Section 4 of
   <http://trustee.ietf.org/docs/IETF-Copyright-FAQ.pdf> for further
   information about when to use this value.

      Note: this text appears under "Copyright Notice", unless the
      document was published before November 2009, in which case it
      appears under "Status Of This Memo".

A.2.2.  Historic Values

A.2.2.1.  Historic Values: '*trust200811'

   The attribute values "trust200811", "noModificationTrust200811" and
   "noDerivativesTrust200811" are similar to their "trust200902"



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   counterparts, except that they use text specified in <http://
   trustee.ietf.org/license-info/archive/
   IETF-Trust-License-Policy_11-10-08.pdf>.

A.2.2.2.  Historic Values: '*3978'

   The attribute values "full3978", "noModification3978" and
   "noDerivatives3978" are similar to their counterparts above, except
   that they use text specified in RFC 3978 (March 2005).

A.2.2.3.  Historic Values: '*3667'

   The attribute values "full3667", "noModification3667" and
   "noDerivatives3667" are similar to their counterparts above, except
   that they use text specified in RFC 3667 (February 2004).

A.2.2.4.  Historic Values: '*2026'

   The attribute values "full2026" and "noDerivativeWorks2026" are
   similar to their counterparts above, except that they use text
   specified in RFC 2026 (October 1996).

   The special value "none" was also used back then, and denied the IETF
   any rights beyond publication as Internet-Draft.

Appendix B.  The v3 Format and Processors

   This section describes topics that are specific to processors.  Note
   that there is some discussion of processors in the main body of the
   document as well.  For example, some elements have descriptions of
   how a processor might create output from the element.

   A processor has multiple roles.  The processor checks whether or not
   the input is valid XML; it also checks whether or not the input XML
   matches this format.  It may have one or more outputs, depending on
   the way that it is invoked.  It might convert the XML to different
   XML, or to a different representation such as HTML or plain text, or
   do no conversion at all.  It also might give diagnostic warnings
   about how to improve the input.

   In v2, the grammar was specified as a DTD.  In v3, the grammar is
   specified only as Relax Next Generation (RNG).  This means that
   processors need to work from the RNG, not from a DTD.  Some of the
   features of the v3 grammar cannot be specified as a DTD.

   This section differentiates between three types of processors:





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   o  RFC Processor -- The processor used by the RFC Editor to process
      the input from one of the RFC streams, and to process XML produced
      during the RFC editing process.

   o  Draft Processor -- The processor used by the Internet Draft
      submission tool.

   o  Private Processors -- There may be processors that are meant to
      run on the computers of authors.  These processors may be used to
      produce interim versions of the non-canonical representations so
      that authors can see how their XML might later be rendered; to
      create documents in representations different than those supported
      by the RFC Editor; to possibly create documents that are not meant
      to be Internet Drafts or RFCs; and to convert XML that has
      external information into XML that has that external information
      included.

   [[anchor13: There needs to be more focus on processors before this
   document is complete.  In specific, does this document get to say
   what the Draft Processor gets to do?  Should this document say even
   less about Private Processors?]]

   It is expected that a single piece of software will be used for both
   the RFC Processor and the Draft Processor, with different application
   settings to differentiate between them.  It is also expected that the
   same software could be used as a Private Processor; others might
   create Private Processors independently, or using parts of, the
   software used by the RFC Editor.

   The RFC Processor and Draft Processor must have clear error
   reporting, giving more context than just a line number.  For example,
   the error messages will differentiate between errors in XML and those
   from the v3 format.

   It is expected that both the RFC Processor and the Draft Processor
   will have options to produce different types of output.  For example,
   they might have a "convert XML to XML" option that expands the XML
   entities in the output.

B.1.  Including External Text

   All XML processors for v3 are expected to support XInclude
   [XInclude].  XInclude specifies a processing model and syntax for
   general purpose inclusion of information that is either on the
   Internet or local to the user's computer.

   In the v3 syntax, XInclude is expressed as the <xi:include> element.
   To use this element, you need to include the "xi" namespace in the



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   <rfc> element; that is, you need to specify

   xmlns:xi="http://www.w3.org/2001/XInclude"

   as one of the attributes in the <rfc> element.

   The most common way to use <xi:include> is to pull in references that
   are already formed as XML.  Currently, this can be done from
   xml2rfc.tools.ietf.org, but later is expected to be from the RFC
   Editor.  For example, if a document has three normative references,
   all RFCs, the document might contain:

   <references>
       <xi:include href="http://xml2rfc.tools.ietf.org/public/rfc/
          bibxml/reference.RFC.2119.xml"/>
       <xi:include href="http://xml2rfc.tools.ietf.org/public/rfc/
          bibxml/reference.RFC.4869.xml"/>
       <xi:include href="http://xml2rfc.tools.ietf.org/public/rfc/
          bibxml/reference.RFC.7169.xml"/>
   </references>

   <xi:include> can be used anywhere an XML element could be used (but
   not where free text is used).  For example, if three Internet Drafts
   are all including a particular paragraph or section verbatim, that
   text can be kept either in a file or somewhere on the web, and be
   included with <xi:include>.  An example of pulling something from the
   local disk would be:

   <x:include href="file://home/chris/ietf/drafts/commontext.xml"/>

   In general, XInclude should be used instead of ENTITY references and
   XML Processor Instructions (PIs) that allow external inclusions.

   [[anchor14: Need to think a bit more about using xi:include to
   replace src= for artwork or sourcecode.]]

B.2.  Anchors and IDs

   People writing and reading Internet Drafts and RFCs often want to
   make reference to specific locations in those documents.  In the case
   of RFC authors, it is common to want to reference another part of
   their document, such as "see Section 3.2 of this document".  Readers,
   on the other hand, want to reference part of documents that they
   didn't write, such as "see Section 3.2 of RFC 6949".  The XML
   vocabulary in this document attempts to support both sets of people.

   Authors can leave anchors in a document that can later be used for
   references with the "anchor" attribute.  Anchors can be included in



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   the following elements: <artwork>, <aside>, <blockquote>, <cref>,
   <figure>, <li>, <reference>, <referencegroup>, <section>,
   <sourcecode>, <t>, and <table>.  The author can then refer to that
   anchor in the "target" attribute of the <xref> element.

   Readers can refer to any element that has an "anchor" attribute by
   that attribute.  Note, however, that most of the time, elements won't
   have anchors.  In the common case, the reader wants to refer to an
   element that does not have an "anchor" attribute, but that element
   has "partNumber" attribute.

   Processors add the "partNumber" attribute to many elements during
   processing.  This attribute and its value are automatically generated
   by the processor if the attribute is not there; if the attribute is
   already there, the processor may replace the value.

B.2.1.  Overlapping Values

   In the HTML representation of this XML vocabulary, both anchors and
   partNumber attributes will be used in the "id" attributes of
   elements.  Thus, there can be no overlap between the names entered in
   "anchor" attributes, the values in the "figureNumber", "tableNumber",
   and "sectionNumber" attributes, in "slugifiedName" attributes, and
   those that are generated for the "partNumber" attributes.  Also,
   there are some values for the "anchor" values that are reserved for
   sections, and those sections can only have those anchor values.

   The following rules prevent this overlap:

   o  "figureNumber" always has the format "f-nnn", where "nnn" is the
      figure number.  For example, this would be "f-5" for Figure 5.

   o  "tableNumber" always has the format "t-nnn", where "nnn" is the
      figure number.  For example, this would be "t-5" for Table 5.

   o  "sectionNumber" always has the format "s-nnn", where "nnn" is the
      section number.  For example, this would be "s-2.1.3" for Section
      2.1.3.

   o  "partNumber" always has the format "p-nnn-mmm", where "nnn" is the
      section number and "mmm" is the relative position in the section.
      For example, this would be "p-2.1.3-7" for the seventh part number
      in Section 2.1.3.

   o  "slugifiedName" always has the format "n-ttt", where "ttt" is the
      text of the name after slugification.  For example, this would be
      "n-protocol-overview" for the name "Protocol Overview".  The
      actual conversions done in slugification will be specified at a



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      later time..

   o  Anchors must never overlap with any of the above.  The easiest way
      to assure that is to not pick an anchor name that starts with a
      single letter followed by a hyphen.  If an anchor does overlap
      with one of the types of names above, the processor will reject
      the document.

Appendix C.  Relax NG Schema

   The following is the RelaxNG schema for the v3 format.


   namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

   rfc =
     element rfc {
       attribute number { text }?,
       [ a:defaultValue = "" ] attribute obsoletes { text }?,
       [ a:defaultValue = "" ] attribute updates { text }?,
       attribute category { "std" | "bcp" | "info" | "exp" | "historic"
   }?,
       attribute consensus { "no" | "yes" }?,
       attribute seriesNo { text }?,
       attribute ipr {
         "full2026"
         | "noDerivativeWorks2026"
         | "none"
         | "full3667"
         | "noModification3667"
         | "noDerivatives3667"
         | "full3978"
         | "noModification3978"
         | "noDerivatives3978"
         | "trust200811"
         | "noModificationTrust200811"
         | "noDerivativesTrust200811"
         | "trust200902"
         | "noModificationTrust200902"
         | "noDerivativesTrust200902"
         | "pre5378Trust200902"
       }?,
       attribute iprExtract { xsd:IDREF }?,
       [ a:defaultValue = "IETF" ]
       attribute submissionType {
         "IETF" | "IAB" | "IRTF" | "independent"
       }?,
       attribute docName { text }?,



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       [ a:defaultValue = "en" ] attribute xml:lang { text }?,
       [ a:defaultValue = "no" ] attribute sortRefs { "yes" | "no" }?,
       [ a:defaultValue = "yes" ] attribute symRefs { "yes" | "no" }?,
       [ a:defaultValue = "yes" ] attribute tocInclude { "yes" | "no"
   }?,
       [ a:defaultValue = "3" ] attribute tocDepth { text }?,
       attribute boilerplateText { text }?,
       link?,
       front,
       middle,
       back?
     }
   link =
     element link {
       attribute href { text },
       attribute rel { text }?
     }
   front =
     element front {
       title, author+, date?, area*, workgroup*, keyword*, abstract?,
   note*
     }
   title =
     element title {
       attribute abbrev { text }?,
       attribute ascii { text }?,
       text
     }
   author =
     element author {
       attribute initials { text }?,
       attribute surname { text }?,
       attribute fullname { text }?,
       attribute role { "editor" }?,
       [ a:defaultValue = "en" ] attribute xml:lang { text }?,
       attribute ascii { text }?,
       organization?,
       address?
     }
   organization =
     element organization {
       attribute abbrev { text }?,
       attribute ascii { text }?,
       text
     }
   address =
     element address { (email | facsimile | phone | postal | uri)* }
   postal =



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     element postal {
       [ a:defaultValue = "en" ] attribute xml:lang { text }?,
       ((city | code | country | region | street)* | postalLine+)
     }
   street =
     element street {
       attribute ascii { text }?,
       text
     }
   city =
     element city {
       attribute ascii { text }?,
       text
     }
   region =
     element region {
       attribute ascii { text }?,
       text
     }
   code =
     element code {
       attribute ascii { text }?,
       text
     }
   country = element country { text }
   postalLine =
     element postalLine {
       attribute ascii { text }?,
       text
     }
   phone = element phone { text }
   facsimile = element facsimile { text }
   email =
     element email {
       attribute ascii { text }?,
       text
     }
   uri = element uri { text }
   date =
     element date {
       attribute day { text }?,
       attribute month { text }?,
       attribute year { text }?,
       empty
     }
   area = element area { text }
   workgroup = element workgroup { text }
   keyword = element keyword { text }



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   abstract = element abstract { t+ }
   note =
     element note {
       attribute title { text }?,
       name?,
       t+
     }
   middle = element middle { section+ }
   section =
     element section {
       attribute anchor { xsd:ID }?,
       attribute title { text }?,
       [ a:defaultValue = "yes" ] attribute numbered { "yes" | "no" }?,
       [ a:defaultValue = "default" ]
       attribute toc { "include" | "exclude" | "default" }?,
       [ a:defaultValue = "no" ] attribute removeInRFC { "yes" | "no"
   }?,
       attribute sectionNumber { text }?,
       name?,
       (artwork
        | aside
        | blockquote
        | dl
        | figure
        | iref
        | ol
        | sourcecode
        | t
        | table
        | texttable
        | ul)*,
       section*
     }
   name =
     element name {
       attribute slugifiedName { text }?,
       (text | cref | eref | iref | tt | xref)*
     }
   t =
     element t {
       attribute anchor { xsd:ID }?,
       attribute hangText { text }?,
       attribute partNumber { text }?,
       (text
        | b
        | bcp14
        | cref
        | em



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        | eref
        | i
        | iref
        | \list
        | ol
        | spanx
        | strong
        | sub
        | sup
        | tt
        | vspace
        | xref)*
     }
   aside =
     element aside {
       attribute anchor { xsd:ID }?,
       attribute partNumber { text }?,
       (artwork | figure | iref | sourcecode | t | texttable)*
     }
   blockquote =
     element blockquote {
       attribute anchor { xsd:ID }?,
       attribute partNumber { text }?,
       attribute cite { text },
       (text
        | artwork
        | b
        | bcp14
        | em
        | figure
        | i
        | sourcecode
        | strong
        | sub
        | sup
        | tt)*
     }
   \list =
     element list {
       [ a:defaultValue = "empty" ] attribute style { text }?,
       attribute hangIndent { text }?,
       attribute counter { text }?,
       t+
     }
   ol =
     element ol {
       [ a:defaultValue = "1" ] attribute style { text }?,
       [ a:defaultValue = "1" ] attribute start { text }?,



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       attribute group { text }?,
       [ a:defaultValue = "normal" ]
       attribute spacing { "normal" | "compact" }?,
       li+
     }
   ul =
     element ul {
       [ a:defaultValue = "normal" ]
       attribute spacing { "normal" | "compact" }?,
       [ a:defaultValue = "false" ] attribute empty { "false" | "true"
   }?,
       li+
     }
   li =
     element li {
       attribute anchor { xsd:ID }?,
       attribute partNumber { text }?,
       (t+
        | (text
           | artwork
           | b
           | bcp14
           | cref
           | dl
           | em
           | eref
           | figure
           | i
           | iref
           | ol
           | sourcecode
           | strong
           | sub
           | sup
           | tt
           | ul
           | xref)+)
     }
   dl =
     element dl {
       [ a:defaultValue = "normal" ]
       attribute spacing { "normal" | "compact" }?,
       [ a:defaultValue = "false" ]
       attribute hanging { "false" | "true" }?,
       (dt, dd)+
     }
   dt =
     element dt {



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       (text
        | b
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | strong
        | sub
        | sup
        | tt
        | xref)*
     }
   dd =
     element dd {
       t+
       | (text
          | artwork
          | b
          | bcp14
          | cref
          | dl
          | em
          | eref
          | figure
          | i
          | iref
          | ol
          | sourcecode
          | strong
          | sub
          | sup
          | tt
          | ul
          | xref)+
     }
   xref =
     element xref {
       attribute target { xsd:IDREF },
       [ a:defaultValue = "false" ] attribute pageno { "true" | "false"
   }?,
       [ a:defaultValue = "default" ]
       attribute format { "counter" | "title" | "none" | "default" }?,
       (attribute section { text },
        attribute relative { text }?,
        attribute sectionFormat { text }?)?,
       text



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     }
   eref =
     element eref {
       attribute target { text },
       text
     }
   iref =
     element iref {
       attribute item { text },
       [ a:defaultValue = "" ] attribute subitem { text }?,
       [ a:defaultValue = "false" ]
       attribute primary { "true" | "false" }?,
       empty
     }
   cref =
     element cref {
       attribute anchor { xsd:ID }?,
       attribute source { text }?,
       (text | b | em | eref | i | strong | sub | sup | tt | xref)*
     }
   tt =
     element tt {
       (text
        | b
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | strong
        | sub
        | sup
        | xref)*
     }
   b =
     element b {
       (text
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | sub
        | sup
        | tt
        | xref)*



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     }
   strong =
     element strong {
       (text
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | sub
        | sup
        | tt
        | xref)*
     }
   i =
     element i {
       (text
        | b
        | bcp14
        | cref
        | eref
        | iref
        | strong
        | sub
        | sup
        | tt
        | xref)*
     }
   em =
     element em {
       (text
        | b
        | bcp14
        | cref
        | eref
        | iref
        | strong
        | sub
        | sup
        | tt
        | xref)*
     }
   sub =
     element sub {
       (text
        | b
        | bcp14



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        | cref
        | em
        | eref
        | i
        | iref
        | strong
        | tt
        | xref)*
     }
   sup =
     element sup {
       (text
        | b
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | strong
        | tt
        | xref)*
     }
   spanx =
     element spanx {
       [ a:defaultValue = "preserve" ]
       attribute xml:space { "default" | "preserve" }?,
       [ a:defaultValue = "emph" ] attribute style { text }?,
       text
     }
   vspace =
     element vspace {
       [ a:defaultValue = "0" ] attribute blankLines { text }?,
       empty
     }
   figure =
     element figure {
       attribute anchor { xsd:ID }?,
       [ a:defaultValue = "" ] attribute title { text }?,
       [ a:defaultValue = "false" ]
       attribute suppress-title { "true" | "false" }?,
       attribute src { text }?,
       [ a:defaultValue = "left" ]
       attribute align { "left" | "center" | "right" }?,
       [ a:defaultValue = "" ] attribute alt { text }?,
       [ a:defaultValue = "" ] attribute width { text }?,
       [ a:defaultValue = "" ] attribute height { text }?,
       attribute figureNumber { text }?,



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       name?,
       iref*,
       preamble?,
       (artwork | sourcecode)+,
       postamble?
     }
   table =
     element table {
       attribute anchor { xsd:ID }?,
       attribute tableNumber { text }?,
       name?,
       iref*,
       thead?,
       tbody+,
       tfoot?
     }
   preamble =
     element preamble {
       (text
        | b
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | spanx
        | strong
        | sub
        | sup
        | tt
        | xref)*
     }
   artwork =
     element artwork {
       attribute xml:space { text }?,
       [ a:defaultValue = "" ] attribute name { text }?,
       [ a:defaultValue = "" ] attribute type { text }?,
       attribute src { text }?,
       [ a:defaultValue = "left" ]
       attribute align { "left" | "center" | "right" }?,
       [ a:defaultValue = "" ] attribute alt { text }?,
       [ a:defaultValue = "" ] attribute width { text }?,
       [ a:defaultValue = "" ] attribute height { text }?,
       [ a:defaultValue = "en" ] attribute xml:lang { text }?,
       attribute anchor { xsd:ID }?,
       attribute partNumber { text }?,
       text*



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     }
   sourcecode =
     element sourcecode {
       [ a:defaultValue = "" ] attribute name { text }?,
       [ a:defaultValue = "" ] attribute type { text }?,
       attribute anchor { xsd:ID }?,
       attribute partNumber { text }?,
       text
     }
   thead = element thead { tr+ }
   tbody = element tbody { tr+ }
   tfoot = element tfoot { tr+ }
   tr =
     element tr {
       [ a:defaultValue = "0" ] attribute border { text }?,
       (td, th)+
     }
   td =
     element td {
       [ a:defaultValue = "0" ] attribute border { text }?,
       [ a:defaultValue = "0" ] attribute colspan { text }?,
       [ a:defaultValue = "0" ] attribute rowspan { text }?,
       (t+
        | (text
           | artwork
           | b
           | bcp14
           | cref
           | dl
           | em
           | eref
           | figure
           | i
           | iref
           | ol
           | sourcecode
           | strong
           | sub
           | sup
           | tt
           | ul
           | xref)+)
     }
   th =
     element th {
       [ a:defaultValue = "0" ] attribute border { text }?,
       [ a:defaultValue = "0" ] attribute colspan { text }?,
       [ a:defaultValue = "0" ] attribute rowspan { text }?,



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       (t+
        | (text
           | artwork
           | b
           | bcp14
           | cref
           | dl
           | em
           | eref
           | figure
           | i
           | iref
           | ol
           | sourcecode
           | strong
           | sub
           | sup
           | tt
           | ul
           | xref)+)
     }
   postamble =
     element postamble {
       (text
        | b
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | spanx
        | strong
        | sub
        | sup
        | tt
        | xref)*
     }
   texttable =
     element texttable {
       attribute anchor { xsd:ID }?,
       [ a:defaultValue = "" ] attribute title { text }?,
       [ a:defaultValue = "false" ]
       attribute suppress-title { "true" | "false" }?,
       [ a:defaultValue = "center" ]
       attribute align { "left" | "center" | "right" }?,
       [ a:defaultValue = "full" ]
       attribute style { "all" | "none" | "headers" | "full" }?,



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       name?,
       preamble?,
       ttcol+,
       c*,
       postamble?
     }
   ttcol =
     element ttcol {
       attribute width { text }?,
       [ a:defaultValue = "left" ]
       attribute align { "left" | "center" | "right" }?,
       (cref | eref | iref | xref | text)*
     }
   c =
     element c {
       (text
        | b
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | spanx
        | strong
        | sub
        | sup
        | tt
        | xref)*
     }
   bcp14 = element bcp14 { text }
   back = element back { displayreference*, references*, section* }
   displayreference =
     element displayreference {
       attribute from { text },
       attribute to { text }
     }
   references =
     element references {
       [ a:defaultValue = "References" ] attribute title { text }?,
       reference+
     }
   reference =
     element reference {
       attribute anchor { xsd:ID },
       attribute target { text }?,
       front,
       (annotation | format | refcontent | seriesInfo)*



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     }
   referencegroup =
     element referencegroup {
       attribute anchor { xsd:ID },
       reference+
     }
   seriesInfo =
     element seriesInfo {
       attribute name { text },
       attribute value { text },
       attribute asciiname { text }?,
       attribute asciivalue { text }?,
       empty
     }
   format =
     element format {
       attribute target { text }?,
       attribute type { text },
       attribute octets { text }?,
       empty
     }
   annotation =
     element annotation {
       attribute ascii { text }?,
       (text
        | b
        | bcp14
        | cref
        | em
        | eref
        | i
        | iref
        | spanx
        | strong
        | sub
        | sup
        | tt
        | xref)*
     }
   refcontent =
     element refcontent {
       attribute ascii { text }?,
       (text | b | bcp14 | em | i | strong | sub | sup | tt)*
     }
   start = rfc






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Appendix D.  Schema Differences from v2

   The following is a non-normative comparison of the v3 format to the
   v2 format.  A "-" indicates lines removed from the v2 schema, and a
   "+" indicates lines added to the v3 schema.


     namespace a =
     "http://relaxng.org/ns/compatibility/annotations/1.0"

     rfc =
       element rfc {
         attribute number { text }?,
         [ a:defaultValue = "" ] attribute obsoletes { text }?,
         [ a:defaultValue = "" ] attribute updates { text }?,
         attribute category { "std" | "bcp" | "info" | "exp" |
     "historic" }?,
         attribute consensus { "no" | "yes" }?,
         attribute seriesNo { text }?,
         attribute ipr {
           "full2026"
           | "noDerivativeWorks2026"
           | "none"
           | "full3667"
           | "noModification3667"
           | "noDerivatives3667"
           | "full3978"
           | "noModification3978"
           | "noDerivatives3978"
           | "trust200811"
           | "noModificationTrust200811"
           | "noDerivativesTrust200811"
           | "trust200902"
           | "noModificationTrust200902"
           | "noDerivativesTrust200902"
           | "pre5378Trust200902"
         }?,
         attribute iprExtract { xsd:IDREF }?,
         [ a:defaultValue = "IETF" ]
         attribute submissionType {
           "IETF" | "IAB" | "IRTF" | "independent"
         }?,
         attribute docName { text }?,
         [ a:defaultValue = "en" ] attribute xml:lang { text }?,
   +     [ a:defaultValue = "no" ] attribute sortRefs { "yes" | "no"
   + }?,
   +     [ a:defaultValue = "yes" ] attribute symRefs { "yes" | "no"
   + }?,



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   +     [ a:defaultValue = "yes" ] attribute tocInclude { "yes" |
   + "no" }?,
   +     [ a:defaultValue = "3" ] attribute tocDepth { text }?,
   +     attribute boilerplateText { text }?,
   +     link?,
         front,
         middle,
         back?
       }
   + link =
   +   element link {
   +     attribute href { text },
   +     attribute rel { text }?
   +   }
     front =
       element front {
   -     title, author+, date, area*, workgroup*, keyword*, abstract?,
   - note*
   +     title, author+, date?, area*, workgroup*, keyword*,
   + abstract?, note*
       }
     title =
       element title {
         attribute abbrev { text }?,
   +     attribute ascii { text }?,
         text
       }
     author =
       element author {
         attribute initials { text }?,
         attribute surname { text }?,
         attribute fullname { text }?,
         attribute role { "editor" }?,
   +     [ a:defaultValue = "en" ] attribute xml:lang { text }?,
   +     attribute ascii { text }?,
         organization?,
         address?
       }
     organization =
       element organization {
         attribute abbrev { text }?,
   +     attribute ascii { text }?,
   +     text
   +   }
   + address =
   +   element address { (email | facsimile | phone | postal | uri)* }
   + postal =
   +   element postal {



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   +     [ a:defaultValue = "en" ] attribute xml:lang { text }?,
   +     ((city | code | country | region | street)* | postalLine+)
   +   }
   + street =
   +   element street {
   +     attribute ascii { text }?,
   +     text
   +   }
   + city =
   +   element city {
   +     attribute ascii { text }?,
   +     text
   +   }
   + region =
   +   element region {
   +     attribute ascii { text }?,
   +     text
   +   }
   + code =
   +   element code {
   +     attribute ascii { text }?,
         text
       }
   - address = element address { postal?, phone?, facsimile?, email?,
   - uri? }
   - postal = element postal { street+, (city | region | code |
   - country)* }
   - street = element street { text }
   - city = element city { text }
   - region = element region { text }
   - code = element code { text }
     country = element country { text }
   + postalLine =
   +   element postalLine {
   +     attribute ascii { text }?,
   +     text
   +   }
     phone = element phone { text }
     facsimile = element facsimile { text }
   - email = element email { text }
   + email =
   +   element email {
   +     attribute ascii { text }?,
   +     text
   +   }
     uri = element uri { text }
     date =
       element date {



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         attribute day { text }?,
         attribute month { text }?,
         attribute year { text }?,
         empty
       }
     area = element area { text }
     workgroup = element workgroup { text }
     keyword = element keyword { text }
     abstract = element abstract { t+ }
     note =
       element note {
   -     attribute title { text },
   +     attribute title { text }?,
   +     name?,
         t+
       }
     middle = element middle { section+ }
     section =
       element section {
         attribute anchor { xsd:ID }?,
   -     attribute title { text },
   +     attribute title { text }?,
   +     [ a:defaultValue = "yes" ] attribute numbered { "yes" | "no"
   + }?,
         [ a:defaultValue = "default" ]
         attribute toc { "include" | "exclude" | "default" }?,
   -     (t | figure | texttable | iref)*,
   +     [ a:defaultValue = "no" ] attribute removeInRFC { "yes" |
   + "no" }?,
   +     attribute sectionNumber { text }?,
   +     name?,
   +     (artwork
   +      | aside
   +      | blockquote
   +      | dl
   +      | figure
   +      | iref
   +      | ol
   +      | sourcecode
   +      | t
   +      | table
   +      | texttable
   +      | ul)*,
         section*
       }
   + name =
   +   element name {
   +     attribute slugifiedName { text }?,



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   +     (text | cref | eref | iref | tt | xref)*
   +   }
     t =
       element t {
         attribute anchor { xsd:ID }?,
         attribute hangText { text }?,
   +     attribute partNumber { text }?,
         (text
   -      | \list
   -      | figure
   -      | xref
   +      | b
   +      | bcp14
   +      | cref
   +      | em
          | eref
   +      | i
          | iref
   -      | cref
   +      | \list
   +      | ol
          | spanx
   -      | vspace)*
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | vspace
   +      | xref)*
   +   }
   + aside =
   +   element aside {
   +     attribute anchor { xsd:ID }?,
   +     attribute partNumber { text }?,
   +     (artwork | figure | iref | sourcecode | t | texttable)*
   +   }
   + blockquote =
   +   element blockquote {
   +     attribute anchor { xsd:ID }?,
   +     attribute partNumber { text }?,
   +     attribute cite { text },
   +     (text
   +      | artwork
   +      | b
   +      | bcp14
   +      | em
   +      | figure
   +      | i



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   +      | sourcecode
   +      | strong
   +      | sub
   +      | sup
   +      | tt)*
       }
     \list =
       element list {
   -     attribute style { text }?,
   +     [ a:defaultValue = "empty" ] attribute style { text }?,
         attribute hangIndent { text }?,
         attribute counter { text }?,
         t+
       }
   + ol =
   +   element ol {
   +     [ a:defaultValue = "1" ] attribute style { text }?,
   +     [ a:defaultValue = "1" ] attribute start { text }?,
   +     attribute group { text }?,
   +     [ a:defaultValue = "normal" ]
   +     attribute spacing { "normal" | "compact" }?,
   +     li+
   +   }
   + ul =
   +   element ul {
   +     [ a:defaultValue = "normal" ]
   +     attribute spacing { "normal" | "compact" }?,
   +     [ a:defaultValue = "false" ] attribute empty { "false" |
   + "true" }?,
   +     li+
   +   }
   + li =
   +   element li {
   +     attribute anchor { xsd:ID }?,
   +     attribute partNumber { text }?,
   +     (t+
   +      | (text
   +         | artwork
   +         | b
   +         | bcp14
   +         | cref
   +         | dl
   +         | em
   +         | eref
   +         | figure
   +         | i
   +         | iref
   +         | ol



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   +         | sourcecode
   +         | strong
   +         | sub
   +         | sup
   +         | tt
   +         | ul
   +         | xref)+)
   +   }
   + dl =
   +   element dl {
   +     [ a:defaultValue = "normal" ]
   +     attribute spacing { "normal" | "compact" }?,
   +     [ a:defaultValue = "false" ]
   +     attribute hanging { "false" | "true" }?,
   +     (dt, dd)+
   +   }
   + dt =
   +   element dt {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
   +   }
   + dd =
   +   element dd {
   +     t+
   +     | (text
   +        | artwork
   +        | b
   +        | bcp14
   +        | cref
   +        | dl
   +        | em
   +        | eref
   +        | figure
   +        | i
   +        | iref
   +        | ol
   +        | sourcecode



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   +        | strong
   +        | sub
   +        | sup
   +        | tt
   +        | ul
   +        | xref)+
   +   }
     xref =
       element xref {
         attribute target { xsd:IDREF },
         [ a:defaultValue = "false" ] attribute pageno { "true" |
     "false" }?,
         [ a:defaultValue = "default" ]
         attribute format { "counter" | "title" | "none" | "default"
     }?,
   +     (attribute section { text },
   +      attribute relative { text }?,
   +      attribute sectionFormat { text }?)?,
         text
       }
     eref =
       element eref {
         attribute target { text },
         text
       }
     iref =
       element iref {
         attribute item { text },
         [ a:defaultValue = "" ] attribute subitem { text }?,
         [ a:defaultValue = "false" ]
         attribute primary { "true" | "false" }?,
         empty
       }
     cref =
       element cref {
         attribute anchor { xsd:ID }?,
         attribute source { text }?,
   -     text
   +     (text | b | em | eref | i | strong | sub | sup | tt | xref)*
   +   }
   + tt =
   +   element tt {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref



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   +      | i
   +      | iref
   +      | strong
   +      | sub
   +      | sup
   +      | xref)*
   +   }
   + b =
   +   element b {
   +     (text
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
   +   }
   + strong =
   +   element strong {
   +     (text
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
   +   }
   + i =
   +   element i {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | eref
   +      | iref
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*



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   +   }
   + em =
   +   element em {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | eref
   +      | iref
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
   +   }
   + sub =
   +   element sub {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref
   +      | strong
   +      | tt
   +      | xref)*
   +   }
   + sup =
   +   element sup {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref
   +      | strong
   +      | tt
   +      | xref)*
       }
     spanx =
       element spanx {
         [ a:defaultValue = "preserve" ]
         attribute xml:space { "default" | "preserve" }?,
         [ a:defaultValue = "emph" ] attribute style { text }?,



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         text
       }
     vspace =
       element vspace {
         [ a:defaultValue = "0" ] attribute blankLines { text }?,
         empty
       }
     figure =
       element figure {
         attribute anchor { xsd:ID }?,
         [ a:defaultValue = "" ] attribute title { text }?,
         [ a:defaultValue = "false" ]
         attribute suppress-title { "true" | "false" }?,
         attribute src { text }?,
         [ a:defaultValue = "left" ]
         attribute align { "left" | "center" | "right" }?,
         [ a:defaultValue = "" ] attribute alt { text }?,
         [ a:defaultValue = "" ] attribute width { text }?,
         [ a:defaultValue = "" ] attribute height { text }?,
   +     attribute figureNumber { text }?,
   +     name?,
         iref*,
         preamble?,
   -     artwork,
   +     (artwork | sourcecode)+,
         postamble?
       }
   + table =
   +   element table {
   +     attribute anchor { xsd:ID }?,
   +     attribute tableNumber { text }?,
   +     name?,
   +     iref*,
   +     thead?,
   +     tbody+,
   +     tfoot?
   +   }
     preamble =
   -   element preamble { (text | xref | eref | iref | cref | spanx)* }
   +   element preamble {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref



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   +      | spanx
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
   +   }
     artwork =
       element artwork {
   -     [ a:defaultValue = "preserve" ]
   -     attribute xml:space { "default" | "preserve" }?,
   +     attribute xml:space { text }?,
         [ a:defaultValue = "" ] attribute name { text }?,
         [ a:defaultValue = "" ] attribute type { text }?,
         attribute src { text }?,
         [ a:defaultValue = "left" ]
         attribute align { "left" | "center" | "right" }?,
         [ a:defaultValue = "" ] attribute alt { text }?,
         [ a:defaultValue = "" ] attribute width { text }?,
         [ a:defaultValue = "" ] attribute height { text }?,
   +     [ a:defaultValue = "en" ] attribute xml:lang { text }?,
   +     attribute anchor { xsd:ID }?,
   +     attribute partNumber { text }?,
         text*
       }
   + sourcecode =
   +   element sourcecode {
   +     [ a:defaultValue = "" ] attribute name { text }?,
   +     [ a:defaultValue = "" ] attribute type { text }?,
   +     attribute anchor { xsd:ID }?,
   +     attribute partNumber { text }?,
   +     text
   +   }
   + thead = element thead { tr+ }
   + tbody = element tbody { tr+ }
   + tfoot = element tfoot { tr+ }
   + tr =
   +   element tr {
   +     [ a:defaultValue = "0" ] attribute border { text }?,
   +     (td, th)+
   +   }
   + td =
   +   element td {
   +     [ a:defaultValue = "0" ] attribute border { text }?,
   +     [ a:defaultValue = "0" ] attribute colspan { text }?,
   +     [ a:defaultValue = "0" ] attribute rowspan { text }?,
   +     (t+
   +      | (text



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   +         | artwork
   +         | b
   +         | bcp14
   +         | cref
   +         | dl
   +         | em
   +         | eref
   +         | figure
   +         | i
   +         | iref
   +         | ol
   +         | sourcecode
   +         | strong
   +         | sub
   +         | sup
   +         | tt
   +         | ul
   +         | xref)+)
   +   }
   + th =
   +   element th {
   +     [ a:defaultValue = "0" ] attribute border { text }?,
   +     [ a:defaultValue = "0" ] attribute colspan { text }?,
   +     [ a:defaultValue = "0" ] attribute rowspan { text }?,
   +     (t+
   +      | (text
   +         | artwork
   +         | b
   +         | bcp14
   +         | cref
   +         | dl
   +         | em
   +         | eref
   +         | figure
   +         | i
   +         | iref
   +         | ol
   +         | sourcecode
   +         | strong
   +         | sub
   +         | sup
   +         | tt
   +         | ul
   +         | xref)+)
   +   }
     postamble =
   -   element postamble { (text | xref | eref | iref | cref | spanx)*
   +   element postamble {



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   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref
   +      | spanx
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
     }
     texttable =
       element texttable {
         attribute anchor { xsd:ID }?,
         [ a:defaultValue = "" ] attribute title { text }?,
         [ a:defaultValue = "false" ]
         attribute suppress-title { "true" | "false" }?,
         [ a:defaultValue = "center" ]
         attribute align { "left" | "center" | "right" }?,
         [ a:defaultValue = "full" ]
         attribute style { "all" | "none" | "headers" | "full" }?,
   +     name?,
         preamble?,
         ttcol+,
         c*,
         postamble?
       }
     ttcol =
       element ttcol {
         attribute width { text }?,
         [ a:defaultValue = "left" ]
         attribute align { "left" | "center" | "right" }?,
   -     text
   +     (cref | eref | iref | xref | text)*
   +   }
   + c =
   +   element c {
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i



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   +      | iref
   +      | spanx
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
   +   }
   + bcp14 = element bcp14 { text }
   + back = element back { displayreference*, references*, section* }
   + displayreference =
   +   element displayreference {
   +     attribute from { text },
   +     attribute to { text }
       }
   - c = element c { (text | xref | eref | iref | cref | spanx)* }
   - back = element back { references*, section* }
     references =
       element references {
         [ a:defaultValue = "References" ] attribute title { text }?,
         reference+
       }
     reference =
       element reference {
         attribute anchor { xsd:ID },
         attribute target { text }?,
         front,
   -     seriesInfo*,
   -     format*,
   -     annotation*
   +     (annotation | format | refcontent | seriesInfo)*
   +   }
   + referencegroup =
   +   element referencegroup {
   +     attribute anchor { xsd:ID },
   +     reference+
       }
     seriesInfo =
       element seriesInfo {
         attribute name { text },
         attribute value { text },
   +     attribute asciiname { text }?,
   +     attribute asciivalue { text }?,
         empty
       }
     format =
       element format {
         attribute target { text }?,



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         attribute type { text },
         attribute octets { text }?,
         empty
       }
     annotation =
   -   element annotation { (text | xref | eref | iref | cref |
   - spanx)* }
   +   element annotation {
   +     attribute ascii { text }?,
   +     (text
   +      | b
   +      | bcp14
   +      | cref
   +      | em
   +      | eref
   +      | i
   +      | iref
   +      | spanx
   +      | strong
   +      | sub
   +      | sup
   +      | tt
   +      | xref)*
   +   }
   + refcontent =
   +   element refcontent {
   +     attribute ascii { text }?,
   +     (text | b | bcp14 | em | i | strong | sub | sup | tt)*
   +   }
     start = rfc


Index

   A
      abbrev attribute
         in organization element  37
         in title element  60
      abstract element  10
         inside front  29
      address element  10
         inside author  16
      align attribute
         in artwork element  13
         in figure element  28
         in texttable element  71
         in ttcol element  72
      alt attribute



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         in artwork element  13
         in figure element  28
      anchor attribute
         in artwork element  13
         in aside element  15
         in blockquote element  19
         in cref element  21
         in figure element  28
         in li element  33
         in reference element  40
         in referencegroup element  41
         in section element  47
         in sourcecode element  50
         in t element  55
         in table element  56
         in texttable element  71
      annotation element  10
         ascii attribute  11
         inside reference  40
      application/rfc+xml Media Type  74
      area element  11
         inside front  29
      artwork element  12
         align attribute  13
         alt attribute  13
         anchor attribute  13
         height attribute  13
         inside aside  15
         inside blockquote  19
         inside dd  22
         inside figure  28
         inside li  32
         inside section  46
         inside td  57
         inside th  59
         name attribute  13
         partNumber attribute  13
         src attribute  14
         type attribute  14
         width attribute  14
         xml:lang attribute  14
         xml:space attribute  14
      ascii attribute
         in annotation element  11
         in author element  16
         in city element  20
         in code element  20
         in email element  26



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         in organization element  37
         in postalLine element  38
         in refcontent element  39
         in region element  41
         in street element  52
         in title element  60
      asciiname attribute
         in seriesInfo element  48
      asciivalue attribute
         in seriesInfo element  49
      aside element  15
         anchor attribute  15
         inside section  46
         partNumber attribute  15
      Attributes
         abbrev  37, 60
         align  13, 28, 71-72
         alt  13, 28
         anchor  13, 15, 19, 21, 28, 33, 40-41, 47, 50, 55-56, 71
         ascii  11, 16, 20, 26, 37-39, 41, 52, 60
         asciiname  48
         asciivalue  49
         blankLines  73
         boilerplateText  42
         border  58-59, 61
         category  42
         cite  19
         colspan  58, 60
         consensus  43
         counter  68
         day  22
         docName  43
         empty  62
         figureNumber  28
         format  64
         from  23
         fullname  16
         group  35
         hangIndent  68
         hanging  24
         hangText  55
         height  13, 28
         href  33
         initials  16
         ipr  43
         iprExtract  44
         item  31
         month  22



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         name  13, 49-50
         number  44
         numbered  47
         obsoletes  44
         octets  67
         pageno  65
         partNumber  13, 15, 19, 33, 50, 55
         primary  31
         rel  34
         relative  65
         removeInRFC  47
         role  16
         rowspan  58, 60
         section  65
         sectionFormat  65
         sectionNumber  48
         seriesNo  44
         slugifiedName  34
         sortRefs  45
         source  21
         spacing  24, 35, 62
         src  14, 28
         start  36
         style  36, 68, 70-71
         subitem  31
         submissionType  45
         suppress-title  28, 71
         surname  16
         symRefs  45
         tableNumber  56
         target  27, 40, 66, 68
         title  29, 35, 41, 48, 72
         to  24
         toc  48
         tocDepth  45
         tocInclude  45
         type  14, 50, 68
         updates  46
         value  49
         width  14, 29, 72
         xml:lang  14, 17, 38, 46
         xml:space  14, 70
         year  22
      author element  15
         ascii attribute  16
         fullname attribute  16
         initials attribute  16
         inside front  29



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         role attribute  16
         surname attribute  16
         xml:lang attribute  17

   B
      b element  17
         inside annotation  11
         inside blockquote  19
         inside c  66
         inside cref  21
         inside dd  22
         inside dt  25
         inside em  26
         inside i  30
         inside li  32
         inside postamble  69
         inside preamble  69
         inside refcontent  39
         inside sub  53
         inside sup  54
         inside t  55
         inside td  57
         inside th  59
         inside tt  61
      back element  18
         inside rfc  42
      bcp14 element  18
         inside annotation  11
         inside b  17
         inside blockquote  19
         inside c  67
         inside dd  22
         inside dt  25
         inside em  26
         inside i  30
         inside li  32
         inside postamble  69
         inside preamble  69
         inside refcontent  39
         inside strong  52
         inside sub  53
         inside sup  54
         inside t  55
         inside td  57
         inside th  59
         inside tt  61
      blankLines attribute
         in vspace element  73



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      blockquote element  18
         anchor attribute  19
         cite attribute  19
         inside section  46
         partNumber attribute  19
      boilerplateText attribute
         in rfc element  42
      border attribute
         in td element  58
         in th element  59
         in tr element  61

   C
      c element  66
         inside texttable  71
      category attribute
         in rfc element  42
      cite attribute
         in blockquote element  19
      city element  19
         ascii attribute  20
         inside postal  38
      code element  20
         ascii attribute  20
         inside postal  38
      colspan attribute
         in td element  58
         in th element  60
      consensus attribute
         in rfc element  43
      counter attribute
         in list element  68
      country element  20
         inside postal  38
      cref element  20
         anchor attribute  21
         inside annotation  11
         inside b  17
         inside c  67
         inside dd  22
         inside dt  25
         inside em  26
         inside i  30
         inside li  32
         inside name  34
         inside postamble  69
         inside preamble  69
         inside strong  52



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         inside sub  53
         inside sup  54
         inside t  55
         inside td  57
         inside th  59
         inside tt  61
         inside ttcol  72
         source attribute  21

   D
      date element  21
         day attribute  22
         inside front  29
         month attribute  22
         year attribute  22
      day attribute
         in date element  22
      dd element  22
         inside dl  24
      displayreference element  23
         from attribute  23
         inside back  18
         to attribute  24
      dl element  24
         hanging attribute  24
         inside dd  22
         inside li  32
         inside section  46
         inside td  57
         inside th  59
         spacing attribute  24
      docName attribute
         in rfc element  43
      dt element  25
         inside dl  24

   E
      Elements
         abstract  10, 29
         address  10, 16
         annotation  10, 40
         area  11, 29
         artwork  12, 15, 19, 22, 28, 32, 46, 57, 59
         aside  15, 46
         author  15, 29
         b  11, 17, 19, 21-22, 25-26, 30, 32, 39, 53-55, 57, 59, 61, 66,
            69
         back  18, 42



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         bcp14  11, 17-19, 22, 25-26, 30, 32, 39, 52-55, 57, 59, 61, 67,
            69
         blockquote  18, 46
         c  66, 71
         city  19, 38
         code  20, 38
         country  20, 38
         cref  11, 17, 20, 22, 25-26, 30, 32, 34, 52-55, 57, 59, 61, 67,
            69, 72
         date  21, 29
         dd  22, 24
         displayreference  18, 23
         dl  22, 24, 32, 46, 57, 59
         dt  24-25
         em  11, 17, 19, 21, 23, 25, 32, 39, 52-55, 57, 59, 61, 67, 69
         email  10, 26
         eref  11, 17, 21, 23, 25-27, 30, 32, 34, 52-55, 57, 59, 61, 67,
            69-70, 72
         facsimile  10, 67
         figure  15, 19, 23, 27, 32, 47, 57, 59
         format  40, 67
         front  29, 40, 42
         i  11, 17, 19, 21, 23, 25, 29, 32, 39, 52-55, 57, 59, 62, 67,
            69-70
         iref  11, 15, 17, 23, 25-27, 30, 32, 34, 47, 52-57, 59, 62, 67,
            69-70, 72
         keyword  29, 31
         li  31, 35, 62
         link  33, 42
         list  55, 68
         middle  34, 42
         name  27, 34-35, 46, 56, 71
         note  29, 35
         ol  23, 32, 35, 47, 55, 57, 59
         organization  16, 37
         phone  10, 37
         postal  10, 37
         postalLine  38
         postamble  28, 68, 71
         preamble  27, 69, 71
         refcontent  38, 40
         reference  40-41
         referencegroup  40
         references  18, 41
         region  38, 41
         rfc  42
         section  18, 34, 46-47
         seriesInfo  40, 48



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         sourcecode  15, 19, 23, 28, 32, 47, 49, 57, 59
         spanx  11, 55, 67, 69-70
         street  38, 51
         strong  11, 19, 21, 23, 25-26, 30, 32, 39, 52-55, 57, 59, 62,
            67, 69-70
         sub  11, 17, 19, 21, 23, 25-26, 30, 32, 39, 52-53, 55, 57, 59,
            62, 67, 69-70
         sup  11, 17, 19, 21, 23, 25-26, 30, 32, 39, 52-53, 55, 57, 59,
            62, 67, 69-70
         t  10, 15, 22, 32, 35, 47, 54, 57-58, 68
         table  47, 56
         tbody  56
         td  57, 61
         texttable  15, 47, 71
         tfoot  56, 58
         th  58, 61
         thead  56, 60
         title  29, 60
         tr  56, 58, 60
         tt  11, 17, 19, 21, 23, 25-26, 30, 32, 34, 39, 52-55, 58-59,
            61, 67, 69-70
         ttcol  71-72
         ul  23, 32, 47, 58-59, 62
         uri  10, 63
         vspace  55, 73
         workgroup  29, 63
         xref  11, 17, 21, 23, 25-26, 30, 32, 34, 52-55, 58-59, 62-63,
            67, 69-70, 72
      em element  25
         inside annotation  11
         inside b  17
         inside blockquote  19
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25
         inside li  32
         inside postamble  69
         inside preamble  69
         inside refcontent  39
         inside strong  52
         inside sub  53
         inside sup  54
         inside t  55
         inside td  57
         inside th  59
         inside tt  61
      email element  26



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         ascii attribute  26
         inside address  10
      empty attribute
         in ul element  62
      eref element  27
         inside annotation  11
         inside b  17
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25
         inside em  26
         inside i  30
         inside li  32
         inside name  34
         inside postamble  69
         inside preamble  70
         inside strong  52
         inside sub  53
         inside sup  54
         inside t  55
         inside td  57
         inside th  59
         inside tt  61
         inside ttcol  72
         target attribute  27

   F
      facsimile element  67
         inside address  10
      figure element  27
         align attribute  28
         alt attribute  28
         anchor attribute  28
         figureNumber attribute  28
         height attribute  28
         inside aside  15
         inside blockquote  19
         inside dd  23
         inside li  32
         inside section  47
         inside td  57
         inside th  59
         src attribute  28
         suppress-title attribute  28
         title attribute  29
         width attribute  29
      figureNumber attribute



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         in figure element  28
      format attribute
         in xref element  64
      format element  67
         inside reference  40
         octets attribute  67
         target attribute  68
         type attribute  68
      from attribute
         in displayreference element  23
      front element  29
         inside reference  40
         inside rfc  42
      fullname attribute
         in author element  16

   G
      group attribute
         in ol element  35

   H
      hangIndent attribute
         in list element  68
      hanging attribute
         in dl element  24
      hangText attribute
         in t element  55
      height attribute
         in artwork element  13
         in figure element  28
      href attribute
         in link element  33

   I
      i element  29
         inside annotation  11
         inside b  17
         inside blockquote  19
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25
         inside li  32
         inside postamble  69
         inside preamble  70
         inside refcontent  39
         inside strong  52
         inside sub  53



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         inside sup  54
         inside t  55
         inside td  57
         inside th  59
         inside tt  62
      initials attribute
         in author element  16
      ipr attribute
         '*2026'  81
         '*3667'  81
         '*3978'  81
         '*trust200811'  80
         '*trust200902'  79
         'noDerivativesTrust200902'  80
         'noModificationTrust200902'  79
         'pre5378Trust200902'  80
         'trust200902'  79
         in rfc element  43
      iprExtract attribute
         in rfc element  44
      iref element  30
         inside annotation  11
         inside aside  15
         inside b  17
         inside c  67
         inside dd  23
         inside dt  25
         inside em  26
         inside figure  27
         inside i  30
         inside li  32
         inside name  34
         inside postamble  69
         inside preamble  70
         inside section  47
         inside strong  52
         inside sub  53
         inside sup  54
         inside t  55
         inside table  56
         inside td  57
         inside th  59
         inside tt  62
         inside ttcol  72
         item attribute  31
         primary attribute  31
         subitem attribute  31
      item attribute



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         in iref element  31

   K
      keyword element  31
         inside front  29

   L
      li element  31
         anchor attribute  33
         inside ol  35
         inside ul  62
         partNumber attribute  33
      link element  33
         href attribute  33
         inside rfc  42
         rel attribute  34
      list element  68
         counter attribute  68
         hangIndent attribute  68
         inside t  55
         style attribute  68

   M
      Media Type
         application/rfc+xml  74
      middle element  34
         inside rfc  42
      month attribute
         in date element  22

   N
      name attribute
         in artwork element  13
         in seriesInfo element  49
         in sourcecode element  50
      name element  34
         inside figure  27
         inside note  35
         inside section  46
         inside table  56
         inside texttable  71
         slugifiedName attribute  34
      note element  35
         inside front  29
         title attribute  35
      number attribute
         in rfc element  44
      numbered attribute



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         in section element  47

   O
      obsoletes attribute
         in rfc element  44
      octets attribute
         in format element  67
      ol element  35
         group attribute  35
         inside dd  23
         inside li  32
         inside section  47
         inside t  55
         inside td  57
         inside th  59
         spacing attribute  35
         start attribute  36
         style attribute  36
      organization element  37
         abbrev attribute  37
         ascii attribute  37
         inside author  16

   P
      pageno attribute
         in xref element  65
      partNumber attribute
         in artwork element  13
         in aside element  15
         in blockquote element  19
         in li element  33
         in sourcecode element  50
         in t element  55
      phone element  37
         inside address  10
      postal element  37
         inside address  10
         xml:lang attribute  38
      postalLine element  38
         ascii attribute  38
         inside postal  38
      postamble element  68
         inside figure  28
         inside texttable  71
      preamble element  69
         inside figure  27
         inside texttable  71
      primary attribute



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         in iref element  31

   R
      refcontent element  38
         ascii attribute  39
         inside reference  40
      reference element  40
         anchor attribute  40
         inside referencegroup  40
         inside references  41
         target attribute  40
      referencegroup element  40
         anchor attribute  41
      references element  41
         inside back  18
         title attribute  41
      region element  41
         ascii attribute  41
         inside postal  38
      rel attribute
         in link element  34
      relative attribute
         in xref element  65
      removeInRFC attribute
         in section element  47
      rfc element  42
         boilerplateText attribute  42
         category attribute  42
         consensus attribute  43
         docName attribute  43
         ipr attribute  43
         iprExtract attribute  44
         number attribute  44
         obsoletes attribute  44
         seriesNo attribute  44
         sortRefs attribute  45
         submissionType attribute  45
         symRefs attribute  45
         tocDepth attribute  45
         tocInclude attribute  45
         updates attribute  46
         xml:lang attribute  46
      role attribute
         in author element  16
      rowspan attribute
         in td element  58
         in th element  60




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   S
      section attribute
         in xref element  65
      section element  46
         anchor attribute  47
         inside back  18
         inside middle  34
         inside section  47
         numbered attribute  47
         removeInRFC attribute  47
         sectionNumber attribute  48
         title attribute  48
         toc attribute  48
      sectionFormat attribute
         in xref element  65
      sectionNumber attribute
         in section element  48
      seriesInfo element  48
         asciiname attribute  48
         asciivalue attribute  49
         inside reference  40
         name attribute  49
         value attribute  49
      seriesNo attribute
         in rfc element  44
      slugifiedName attribute
         in name element  34
      sortRefs attribute
         in rfc element  45
      source attribute
         in cref element  21
      sourcecode element  49
         anchor attribute  50
         inside aside  15
         inside blockquote  19
         inside dd  23
         inside figure  28
         inside li  32
         inside section  47
         inside td  57
         inside th  59
         name attribute  50
         partNumber attribute  50
         type attribute  50
      spacing attribute
         in dl element  24
         in ol element  35
         in ul element  62



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      spanx element  70
         inside annotation  11
         inside c  67
         inside postamble  69
         inside preamble  70
         inside t  55
         style attribute  70
         xml:space attribute  70
      src attribute
         in artwork element  14
         in figure element  28
      start attribute
         in ol element  36
      street element  51
         ascii attribute  52
         inside postal  38
      strong element  52
         inside annotation  11
         inside blockquote  19
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25
         inside em  26
         inside i  30
         inside li  32
         inside postamble  69
         inside preamble  70
         inside refcontent  39
         inside sub  53
         inside sup  54
         inside t  55
         inside td  57
         inside th  59
         inside tt  62
      style attribute
         in list element  68
         in ol element  36
         in spanx element  70
         in texttable element  71
      sub element  53
         inside annotation  11
         inside b  17
         inside blockquote  19
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25



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         inside em  26
         inside i  30
         inside li  32
         inside postamble  69
         inside preamble  70
         inside refcontent  39
         inside strong  52
         inside t  55
         inside td  57
         inside th  59
         inside tt  62
      subitem attribute
         in iref element  31
      submissionType attribute
         in rfc element  45
      sup element  53
         inside annotation  11
         inside b  17
         inside blockquote  19
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25
         inside em  26
         inside i  30
         inside li  32
         inside postamble  69
         inside preamble  70
         inside refcontent  39
         inside strong  52
         inside t  55
         inside td  57
         inside th  59
         inside tt  62
      suppress-title attribute
         in figure element  28
         in texttable element  71
      surname attribute
         in author element  16
      symRefs attribute
         in rfc element  45

   T
      t element  54
         anchor attribute  55
         hangText attribute  55
         inside abstract  10
         inside aside  15



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         inside dd  22
         inside li  32
         inside list  68
         inside note  35
         inside section  47
         inside td  57
         inside th  58
         partNumber attribute  55
      table element  56
         anchor attribute  56
         inside section  47
         tableNumber attribute  56
      tableNumber attribute
         in table element  56
      target attribute
         in eref element  27
         in format element  68
         in reference element  40
         in xref element  66
      tbody element  56
         inside table  56
      td element  57
         border attribute  58
         colspan attribute  58
         inside tr  61
         rowspan attribute  58
      texttable element  71
         align attribute  71
         anchor attribute  71
         inside aside  15
         inside section  47
         style attribute  71
         suppress-title attribute  71
         title attribute  72
      tfoot element  58
         inside table  56
      th element  58
         border attribute  59
         colspan attribute  60
         inside tr  61
         rowspan attribute  60
      thead element  60
         inside table  56
      title attribute
         in figure element  29
         in note element  35
         in references element  41
         in section element  48



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Internet-Draft                  XML2RFCv3                 September 2014


         in texttable element  72
      title element  60
         abbrev attribute  60
         ascii attribute  60
         inside front  29
      to attribute
         in displayreference element  24
      toc attribute
         in section element  48
      tocDepth attribute
         in rfc element  45
      tocInclude attribute
         in rfc element  45
      tr element  60
         border attribute  61
         inside tbody  56
         inside tfoot  58
         inside thead  60
      tt element  61
         inside annotation  11
         inside b  17
         inside blockquote  19
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25
         inside em  26
         inside i  30
         inside li  32
         inside name  34
         inside postamble  69
         inside preamble  70
         inside refcontent  39
         inside strong  52
         inside sub  53
         inside sup  54
         inside t  55
         inside td  58
         inside th  59
      ttcol element  72
         align attribute  72
         inside texttable  71
         width attribute  72
      type attribute
         in artwork element  14
         in format element  68
         in sourcecode element  50




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Internet-Draft                  XML2RFCv3                 September 2014


   U
      ul element  62
         empty attribute  62
         inside dd  23
         inside li  32
         inside section  47
         inside td  58
         inside th  59
         spacing attribute  62
      updates attribute
         in rfc element  46
      uri element  63
         inside address  10

   V
      value attribute
         in seriesInfo element  49
      vspace element  73
         blankLines attribute  73
         inside t  55

   W
      width attribute
         in artwork element  14
         in figure element  29
         in ttcol element  72
      workgroup element  63
         inside front  29

   X
      xml:lang attribute
         in artwork element  14
         in author element  17
         in postal element  38
         in rfc element  46
      xml:space attribute
         in artwork element  14
         in spanx element  70
      xref element  63
         format attribute  64
         inside annotation  11
         inside b  17
         inside c  67
         inside cref  21
         inside dd  23
         inside dt  25
         inside em  26
         inside i  30



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Internet-Draft                  XML2RFCv3                 September 2014


         inside li  32
         inside name  34
         inside postamble  69
         inside preamble  70
         inside strong  52
         inside sub  53
         inside sup  54
         inside t  55
         inside td  58
         inside th  59
         inside tt  62
         inside ttcol  72
         pageno attribute  65
         relative attribute  65
         section attribute  65
         sectionFormat attribute  65
         target attribute  66
      xref formats
         counter  64
         default  64
         none  64
         title  64

   Y
      year attribute
         in date element  22

Author's Address

   Paul Hoffman
   VPN Consortium

   EMail: paul.hoffman@vpnc.org


















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