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Network Working Group                                         P. Hoffman
Internet-Draft                                            VPN Consortium
Obsoletes: 2629 (if approved)                               July 2, 2014
Intended status: Informational
Expires: January 3, 2015


                   The 'XML2RFC' version 3 Vocabulary
                      draft-hoffman-xml2rfc-09

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 January 3, 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>  . . . . . . . . . . . . . . . . . . . . . . .   9
     2.2.  <address> . . . . . . . . . . . . . . . . . . . . . . . .   9
     2.3.  <annotation>  . . . . . . . . . . . . . . . . . . . . . .  10
     2.4.  <area>  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     2.5.  <artwork> . . . . . . . . . . . . . . . . . . . . . . . .  11
     2.6.  <aside> . . . . . . . . . . . . . . . . . . . . . . . . .  14
     2.7.  <author>  . . . . . . . . . . . . . . . . . . . . . . . .  15
     2.8.  <b> . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
     2.9.  <back>  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     2.10. <bcp14> . . . . . . . . . . . . . . . . . . . . . . . . .  17
     2.11. <blockquote>  . . . . . . . . . . . . . . . . . . . . . .  17
     2.12. <c> . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
     2.13. <city>  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     2.14. <code>  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     2.15. <country> . . . . . . . . . . . . . . . . . . . . . . . .  20
     2.16. <cref>  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     2.17. <date>  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     2.18. <dd>  . . . . . . . . . . . . . . . . . . . . . . . . . .  22
     2.19. <displayreference>  . . . . . . . . . . . . . . . . . . .  22
     2.20. <dl>  . . . . . . . . . . . . . . . . . . . . . . . . . .  22
     2.21. <dt>  . . . . . . . . . . . . . . . . . . . . . . . . . .  23
     2.22. <em>  . . . . . . . . . . . . . . . . . . . . . . . . . .  24
     2.23. <email> . . . . . . . . . . . . . . . . . . . . . . . . .  25
     2.24. <eref>  . . . . . . . . . . . . . . . . . . . . . . . . .  25
     2.25. <figure>  . . . . . . . . . . . . . . . . . . . . . . . .  26
     2.26. <front> . . . . . . . . . . . . . . . . . . . . . . . . .  28
     2.27. <i> . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
     2.28. <iref>  . . . . . . . . . . . . . . . . . . . . . . . . .  29
     2.29. <keyword> . . . . . . . . . . . . . . . . . . . . . . . .  30



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     2.30. <li>  . . . . . . . . . . . . . . . . . . . . . . . . . .  30
     2.31. <link>  . . . . . . . . . . . . . . . . . . . . . . . . .  30
     2.32. <middle>  . . . . . . . . . . . . . . . . . . . . . . . .  31
     2.33. <note>  . . . . . . . . . . . . . . . . . . . . . . . . .  31
     2.34. <ol>  . . . . . . . . . . . . . . . . . . . . . . . . . .  32
     2.35. <organization>  . . . . . . . . . . . . . . . . . . . . .  34
     2.36. <phone> . . . . . . . . . . . . . . . . . . . . . . . . .  34
     2.37. <postal>  . . . . . . . . . . . . . . . . . . . . . . . .  34
     2.38. <postalLine>  . . . . . . . . . . . . . . . . . . . . . .  35
     2.39. <postamble> . . . . . . . . . . . . . . . . . . . . . . .  35
     2.40. <preamble>  . . . . . . . . . . . . . . . . . . . . . . .  36
     2.41. <refcontent>  . . . . . . . . . . . . . . . . . . . . . .  37
     2.42. <reference> . . . . . . . . . . . . . . . . . . . . . . .  38
     2.43. <references>  . . . . . . . . . . . . . . . . . . . . . .  38
     2.44. <region>  . . . . . . . . . . . . . . . . . . . . . . . .  39
     2.45. <rfc> . . . . . . . . . . . . . . . . . . . . . . . . . .  39
     2.46. <section> . . . . . . . . . . . . . . . . . . . . . . . .  44
     2.47. <seriesInfo>  . . . . . . . . . . . . . . . . . . . . . .  46
     2.48. <sourcecode>  . . . . . . . . . . . . . . . . . . . . . .  46
     2.49. <street>  . . . . . . . . . . . . . . . . . . . . . . . .  48
     2.50. <strong>  . . . . . . . . . . . . . . . . . . . . . . . .  49
     2.51. <sub> . . . . . . . . . . . . . . . . . . . . . . . . . .  49
     2.52. <sup> . . . . . . . . . . . . . . . . . . . . . . . . . .  50
     2.53. <t> . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
     2.54. <texttable> . . . . . . . . . . . . . . . . . . . . . . .  53
     2.55. <title> . . . . . . . . . . . . . . . . . . . . . . . . .  55
     2.56. <titleelement>  . . . . . . . . . . . . . . . . . . . . .  55
     2.57. <tt>  . . . . . . . . . . . . . . . . . . . . . . . . . .  56
     2.58. <ttcol> . . . . . . . . . . . . . . . . . . . . . . . . .  56
     2.59. <ul>  . . . . . . . . . . . . . . . . . . . . . . . . . .  57
     2.60. <uri> . . . . . . . . . . . . . . . . . . . . . . . . . .  58
     2.61. <workgroup> . . . . . . . . . . . . . . . . . . . . . . .  58
     2.62. <xref>  . . . . . . . . . . . . . . . . . . . . . . . . .  58
   3.  Elements from v2 That Have Been Deprecated  . . . . . . . . .  61
     3.1.  <facsimile> . . . . . . . . . . . . . . . . . . . . . . .  62
     3.2.  <format>  . . . . . . . . . . . . . . . . . . . . . . . .  62
     3.3.  <list>  . . . . . . . . . . . . . . . . . . . . . . . . .  62
     3.4.  <spanx> . . . . . . . . . . . . . . . . . . . . . . . . .  63
     3.5.  <vspace>  . . . . . . . . . . . . . . . . . . . . . . . .  63
   4.  Internationalization Considerations . . . . . . . . . . . . .  64
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  64
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  64
     6.1.  Internet Media Type Registration  . . . . . . . . . . . .  64
     6.2.  Link Relation Registration  . . . . . . . . . . . . . . .  66
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  66
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  66
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  66
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  67



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   Appendix A.  Front Page Generation  . . . . . . . . . . . . . . .  69
     A.1.  The /rfc/@category Attribute  . . . . . . . . . . . . . .  69
     A.2.  The /rfc/@ipr Attribute . . . . . . . . . . . . . . . . .  69
       A.2.1.  Current Values: '*trust200902'  . . . . . . . . . . .  70
       A.2.2.  Historic Values . . . . . . . . . . . . . . . . . . .  71
   Appendix B.  The v3 Format and Processors . . . . . . . . . . . .  72
     B.1.  Including External Text . . . . . . . . . . . . . . . . .  73
   Appendix C.  Format and Content of RFCs (Future)  . . . . . . . .  74
     C.1.  Canonical RFCs  . . . . . . . . . . . . . . . . . . . . .  74
     C.2.  Non-canonical RFC Representations . . . . . . . . . . . .  75
   Appendix D.  Format and Content of Internet Drafts (Future) . . .  75
     D.1.  The Draft Processor . . . . . . . . . . . . . . . . . . .  76
     D.2.  Processor Instructions  . . . . . . . . . . . . . . . . .  76
   Appendix E.  Relax NG Schema  . . . . . . . . . . . . . . . . . .  77
   Appendix F.  Schema Differences from v2 . . . . . . . . . . . . .  88
   Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101



































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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 ([RFCSTYLE]) 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. [[anchor2: More needs
   to be said here about what "obsoletes" means in this case.]]

   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 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.




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

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

   o  Add <titleelement> to sections, 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.

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




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   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 "autogeneratedBoilerplateText", "autogeneratedFigureNumber",
      "autogeneratedParagraphNumber", "autogeneratedSectionNumber", and
      "autogeneratedTableNumber" attributes to <rfc>, <figure>, <t>,
      <section>, and <texttable>, respectively.

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.

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



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   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 for a reference, use the "target" attribute on
      <reference> instead.

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

   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> to be used on its own in <section> (no longer
      confine it to a figure).

   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



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      elements.

   o  In <ttcol>, allow <xref>, <eref>, <iref>, and <cref> as optional
      children.

   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 E (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"
   (Section 2.3 of [XML]).  In short, it is a text string with no spaces
   or colons; hyphens and underscores are allowed.

2.1.  <abstract>

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

   This element appears as child element of: <front> (Section 2.26).

   Content model:

   One or more <t> elements (Section 2.53)

2.2.  <address>

   Provides address information for the author.

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

   Content model:




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   In any order:

   o  <postal> elements (Section 2.37)

   o  <phone> elements (Section 2.36)

   o  <facsimile> elements (Section 3.1)

   o  <email> elements (Section 2.23)

   o  <uri> elements (Section 2.60)

2.3.  <annotation>

   Provides additional prose augmenting a bibliographical reference.

   For instance:

   <annotation>
     Latest version available at <eref
     target='http://www.w3.org/TR/xml'/>.
   </annotation>

   ...will generate the text used in the reference for [XML].

   This element appears as child element of: <reference> (Section 2.42).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <spanx> elements (Section 3.4)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)





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   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

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 fullname 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 child element of: <front> (Section 2.26).

   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



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   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 child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.11), <dd> (Section 2.18), <figure>
   (Section 2.25), <li> (Section 2.30), <section> (Section 2.46), and
   <t> (Section 2.53).

   Content model:

   Text

2.5.1.  'align' attribute

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

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"




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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.  'height' attribute

   Deprecated.

2.5.4.  '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).

2.5.5.  'src' attribute

   The URI of a graphics file.

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

   [[anchor7: Add an example of in-lined SVG here.]]

   [[anchor8: Maybe include microlanguages for packets and call
   sequences if people want to create them.]]

2.5.6.  '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





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   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.

2.5.7.  'width' attribute

   Deprecated.

2.5.8.  '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.

2.5.9.  'xml:space' attribute

   Deprecated.

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 child element of: <section> (Section 2.46).

   Content model:

   In any order:

   o  <t> elements (Section 2.53)

   o  <figure> elements (Section 2.25)

   o  <texttable> elements (Section 2.54)

   o  <iref> elements (Section 2.28)

   o  <artwork> elements (Section 2.5)

   o  <sourcecode> elements (Section 2.48)




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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 [RFCSTYLE]).

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

   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 child element of: <front> (Section 2.26).

   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.



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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.

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 child element of: <annotation> (Section 2.3),
   <blockquote> (Section 2.11), <c> (Section 2.12), <cref>
   (Section 2.16), <dd> (Section 2.18), <dt> (Section 2.21), <em>
   (Section 2.22), <i> (Section 2.27), <li> (Section 2.30), <postamble>
   (Section 2.39), <preamble> (Section 2.40), <refcontent>
   (Section 2.41), <sub> (Section 2.51), <sup> (Section 2.52), <t>
   (Section 2.53), and <tt> (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <tt> elements (Section 2.57)




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   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.9.  <back>

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

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

   Content model:

   In this order:

   1.  Optional <displayreference> elements (Section 2.19)

   2.  Optional <references> elements (Section 2.43)

   3.  Optional <section> elements (Section 2.46)

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>".

   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. [[anchor9: Should this element also use
   autogeneratedParagraphNumber?  Or should there be an
   autogeneratedBlockquoteNumber?]]

   This element appears as child element of: <section> (Section 2.46).




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   Content model:

   In any order:

   o  Text

   o  <figure> elements (Section 2.25)

   o  <artwork> elements (Section 2.5)

   o  <sourcecode> elements (Section 2.48)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

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. [[anchor10: Needs an
   example of a cite for a reference that is already in the spec.]]

2.12.  <c>

   Provides the content of a cell in a table.

   This element appears as child element of: <texttable> (Section 2.54).

   Content model:

   In any order:

   o  Text





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   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <spanx> elements (Section 3.4)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.13.  <city>

   Gives the city name in a postal address.

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

   Content model: only text content.

2.13.1.  'ascii' attribute

   The ASCII equivalent of the city name.

2.14.  <code>

   Gives the postal region code.

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

   Content model: only text content.

2.14.1.  'ascii' attribute

   The ASCII equivalent of the postal code.




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2.15.  <country>

   Gives the country in a postal address.

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

   Content model: only text content.

2.16.  <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 child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <c> (Section 2.12), <dd> (Section 2.18), <dt>
   (Section 2.21), <em> (Section 2.22), <i> (Section 2.27), <li>
   (Section 2.30), <postamble> (Section 2.39), <preamble>
   (Section 2.40), <strong> (Section 2.50), <sub> (Section 2.51), <sup>
   (Section 2.52), <t> (Section 2.53), <titleelement> (Section 2.56),
   <tt> (Section 2.57), and <ttcol> (Section 2.58).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)





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   o  <sup> elements (Section 2.52)

2.16.1.  'anchor' attribute

   Document-wide unique identifier for this comment.

2.16.2.  'source' attribute

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

2.17.  <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
   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 child element of: <front> (Section 2.26).

   Content model: this element does not have any contents.

2.17.1.  'day' attribute

   Day of publication; this is a number.

2.17.2.  'month' attribute

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




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2.17.3.  'year' attribute

   Year of publication.

2.18.  <dd>

   The definition part of an entry in a definition list.

   This element appears as child element of: <dl> (Section 2.20).

   Content model:

   [[anchor11: Missing template for choice.]]

2.19.  <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 child element of: <back> (Section 2.9).

   Content model: this element does not have any contents.

2.19.1.  'from' attribute (mandatory)

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

2.19.2.  '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 "_".

2.20.  <dl>

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

   [[anchor12: The content model below is wrong in the -05 draft.]]



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   This element appears as child element of: <dd> (Section 2.18), <li>
   (Section 2.30), and <t> (Section 2.53).

   Content model:

   One or more sequences of:

   1.  One <dt> element

   2.  One <dd> element

2.20.1.  '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"

2.20.2.  '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"

2.21.  <dt>

   The term being defined in a definition list.

   This element appears as child element of: <dl> (Section 2.20).

   Content model:

   In any order:

   o  Text




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   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.22.  <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 child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <blockquote> (Section 2.11), <c> (Section 2.12),
   <cref> (Section 2.16), <dd> (Section 2.18), <dt> (Section 2.21), <li>
   (Section 2.30), <postamble> (Section 2.39), <preamble>
   (Section 2.40), <refcontent> (Section 2.41), <strong> (Section 2.50),
   <sub> (Section 2.51), <sup> (Section 2.52), <t> (Section 2.53), and
   <tt> (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)




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   o  <cref> elements (Section 2.16)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.23.  <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 child element of: <address> (Section 2.2).

   Content model: only text content.

2.23.1.  '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.

2.24.  <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 child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <c> (Section 2.12), <cref> (Section 2.16), <dd>
   (Section 2.18), <dt> (Section 2.21), <em> (Section 2.22), <i>
   (Section 2.27), <li> (Section 2.30), <postamble> (Section 2.39),
   <preamble> (Section 2.40), <strong> (Section 2.50), <sub>
   (Section 2.51), <sup> (Section 2.52), <t> (Section 2.53),
   <titleelement> (Section 2.56), <tt> (Section 2.57), and <ttcol>
   (Section 2.58).



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   Content model: only text content.

2.24.1.  'target' attribute (mandatory)

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

2.25.  <figure>

   This element is used to represent a figure, consisting of an optional
   preamble, the actual figure, an optional postamble, and an optional
   title.

   This element appears as child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.11), <dd> (Section 2.18), <li>
   (Section 2.30), <section> (Section 2.46), and <t> (Section 2.53).

   Content model:

   In this order:

   1.  One optional <titleelement> element (Section 2.56)

   2.  Optional <iref> elements (Section 2.28)

   3.  One optional <preamble> element (Section 2.40)

   4.  [[anchor13: Missing template for oneOrMore.]]

   5.  One optional <postamble> element (Section 2.39)

2.25.1.  'align' attribute

   Used to change the alignment of <preamble> and <postamble>.

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

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"








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2.25.2.  'alt' attribute

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

2.25.3.  'anchor' attribute

   Document-wide unique identifier for this figure.

   Furthermore, the presence of this attribute causes the figure to be
   numbered.

2.25.4.  'autogeneratedFigureNumber' attribute

   The number for this figure, 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.

2.25.5.  'height' attribute

   Deprecated.

2.25.6.  'src' attribute

   Deprecated.

2.25.7.  'suppress-title' attribute

   Figures that have an "anchor" attribute will automatically get an
   autogenerated title (such as "Figure 1"), even if the "title"
   attribute and the <titleelement> element is absent.  Setting this
   attribute to "true" will prevent this.

   Allowed values:

   o  "true"

   o  "false" (default)

2.25.8.  'title' attribute

   Deprecated.  Use <titleelement> instead.

2.25.9.  'width' attribute

   Deprecated.




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2.26.  <front>

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

   This element appears as child element of: <reference> (Section 2.42),
   and <rfc> (Section 2.45).

   Content model:

   In this order:

   1.  One <title> element (Section 2.55)

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

   3.  One optional <date> element (Section 2.17)

   4.  Optional <area> elements (Section 2.4)

   5.  Optional <workgroup> elements (Section 2.61)

   6.  Optional <keyword> elements (Section 2.29)

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

   8.  Optional <note> elements (Section 2.33)

2.27.  <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 child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <blockquote> (Section 2.11), <c> (Section 2.12),
   <cref> (Section 2.16), <dd> (Section 2.18), <dt> (Section 2.21), <li>
   (Section 2.30), <postamble> (Section 2.39), <preamble>
   (Section 2.40), <refcontent> (Section 2.41), <strong> (Section 2.50),
   <sub> (Section 2.51), <sup> (Section 2.52), <t> (Section 2.53), and
   <tt> (Section 2.57).

   Content model:

   In any order:

   o  Text





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   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.28.  <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).

   For instance:

   <iref item="Grammar" subitem="item"/>

   will produce an index entry for "Grammar, item".

   This element appears as child element of: <annotation> (Section 2.3),
   <aside> (Section 2.6), <b> (Section 2.8), <c> (Section 2.12), <dd>
   (Section 2.18), <dt> (Section 2.21), <em> (Section 2.22), <figure>
   (Section 2.25), <i> (Section 2.27), <li> (Section 2.30), <postamble>
   (Section 2.39), <preamble> (Section 2.40), <section> (Section 2.46),
   <strong> (Section 2.50), <sub> (Section 2.51), <sup> (Section 2.52),
   <t> (Section 2.53), <titleelement> (Section 2.56), <tt>
   (Section 2.57), and <ttcol> (Section 2.58).

   Content model: this element does not have any contents.

2.28.1.  'item' attribute (mandatory)

   The item to include.





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2.28.2.  '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)

2.28.3.  'subitem' attribute

   The subitem to include.

2.29.  <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 child element of: <front> (Section 2.26).

   Content model: only text content.

2.30.  <li>

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

   This element appears as child element of: <ol> (Section 2.34), and
   <ul> (Section 2.59).

   Content model:

   [[anchor14: Missing template for choice.]]

2.31.  <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:





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   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 child element of: <rfc> (Section 2.45).

   Content model: this element does not have any contents.

2.31.1.  'href' attribute (mandatory)

   The URI of the external document.

2.31.2.  'rel' attribute

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

2.32.  <middle>

   Represents the main content of the document.

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

   Content model:

   One or more <section> elements (Section 2.46)

2.33.  <note>

   Creates an unnumbered section that appears after the abstract.




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   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 child element of: <front> (Section 2.26).

   Content model:

   One or more <t> elements (Section 2.53)

2.33.1.  'title' attribute (mandatory)

   The title of the note.

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 child element of: <dd> (Section 2.18), <li>
   (Section 2.30), and <t> (Section 2.53).

   Content model:

   One or more <li> elements (Section 2.30)

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.

   Allowed values:

   o  "normal" (default)

   o  "compact"






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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, ...)

   [[anchor15: Need to determine, and then specify, what happens after
   the 26th letter.]]

   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, ...)

   %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



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   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 [RFCSTYLE] for more information).  If the
   value is long, an abbreviated variant can be specified in the
   "abbrev" attribute.

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

   Content model:




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   [[anchor16: Missing template for choice.]]

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 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.  <postamble>

   Gives text that appears at the bottom of a figure or table.

   This element appears as child element of: <figure> (Section 2.25),
   and <texttable> (Section 2.54).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <spanx> elements (Section 3.4)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)





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   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.40.  <preamble>

   Gives text that appears at the top of a figure or table.

   This element appears as child element of: <figure> (Section 2.25),
   and <texttable> (Section 2.54).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <spanx> elements (Section 3.4)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)





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2.41.  <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
   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 child element of: <reference> (Section 2.42).

   Content model:

   In any order:

   o  Text

   o  <tt> elements (Section 2.57)

   o  <b> elements (Section 2.8)

   o  <i> elements (Section 2.27)

   o  <em> elements (Section 2.22)

   o  <strong> elements (Section 2.50)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)








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2.41.1.  'ascii' attribute

   The ASCII equivalent of the added text.

2.42.  <reference>

   Represents a bibliographical reference.

   This element appears as child element of: <references>
   (Section 2.43).

   Content model:

   In this order:

   1.  One <front> element (Section 2.26)

   2.  In any order:

       *  <seriesInfo> elements (Section 2.47)

       *  <format> elements (Section 3.2)

       *  <refcontent> elements (Section 2.41)

       *  <annotation> elements (Section 2.3)

2.42.1.  '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.

2.42.2.  '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).

2.43.  <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



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   in [RFCSTYLE]).  This vocabulary supports the split with the "title"
   attribute.

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

   Content model:

   One or more <reference> elements (Section 2.42)

2.43.1.  'title' attribute

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

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

2.44.  <region>

   Provides the region name in a postal address.

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

   Content model: only text content.

2.44.1.  'ascii' attribute

   The ASCII equivalent of the region name.

2.45.  <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 2.31)

   2.  One <front> element (Section 2.26)





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   3.  One <middle> element (Section 2.32)

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

2.45.1.  'autogeneratedBoilerplateText' 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.

2.45.2.  'category' attribute

   Document category (see Appendix A.1).

   Allowed values:

   o  "std"

   o  "bcp"

   o  "info"

   o  "exp"

   o  "historic"

2.45.3.  'consensus' attribute

   Affects the generated boilerplate.

   See [RFC5741] for more information.

   Allowed values:

   o  "no"

   o  "yes"

2.45.4.  '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



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   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.

2.45.5.  '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"

   o  "noModification3978"

   o  "noDerivatives3978"

   o  "trust200811"

   o  "noModificationTrust200811"

   o  "noDerivativesTrust200811"

   o  "trust200902"

   o  "noModificationTrust200902"

   o  "noDerivativesTrust200902"

   o  "pre5378Trust200902"







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2.45.6.  '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).

2.45.7.  '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.

2.45.8.  '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.

2.45.9.  'seriesNo' attribute

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

2.45.10.  'sortRefs' attribute

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

   Allowed values:

   o  "yes"

   o  "no" (default)

2.45.11.  'submissionType' attribute

   The document stream.

   See Section 2 of [RFC5741] for details.

   Allowed values:

   o  "IETF" (default)




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   o  "IAB"

   o  "IRTF"

   o  "independent"

2.45.12.  '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"

2.45.13.  'tocDepth' attribute

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

2.45.14.  'tocInclude' attribute

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

   Allowed values:

   o  "yes" (default)

   o  "no"

2.45.15.  '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.

2.45.16.  'xml:lang' attribute

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

   See Section 2.12 of [XML] for more information.



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2.46.  <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 child element of: <back> (Section 2.9),
   <middle> (Section 2.32), and <section> (Section 2.46).

   Content model:

   In this order:

   1.  One optional <titleelement> element (Section 2.56)

   2.  In any order:

       *  <t> elements (Section 2.53)

       *  <aside> elements (Section 2.6)

       *  <blockquote> elements (Section 2.11)

       *  <figure> elements (Section 2.25)

       *  <texttable> elements (Section 2.54)

       *  <iref> elements (Section 2.28)

       *  <artwork> elements (Section 2.5)

       *  <sourcecode> elements (Section 2.48)

   3.  Optional <section> elements (Section 2.46)

2.46.1.  'anchor' attribute

   Document-wide unique identifier for this section.

2.46.2.  'autogeneratedSectionNumber' 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.




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2.46.3.  '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"

2.46.4.  '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)

2.46.5.  'title' attribute

   Deprecated.  Use <titleelement> instead.

2.46.6.  '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"





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   o  "default" (default)

2.47.  <seriesInfo>

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

   This element appears as child element of: <reference> (Section 2.42).

   Content model: this element does not have any contents.

2.47.1.  'asciiname' attribute

   The ASCII equivalent of the name field.

2.47.2.  'asciivalue' attribute

   The ASCII equivalent of the value field.

2.47.3.  '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".

2.47.4.  '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).

2.48.  <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



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   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:

   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 child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.11), <dd> (Section 2.18), <figure>
   (Section 2.25), <li> (Section 2.30), <section> (Section 2.46), and
   <t> (Section 2.53).

   Content model: only text content.

2.48.1.  '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).

2.48.2.  '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
   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:



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   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.

2.49.  <street>

   Provides a street address.

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

   Content model: only text content.







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2.49.1.  'ascii' attribute

   The ASCII equivalent of the street address.

2.50.  <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 child element of: <annotation> (Section 2.3),
   <blockquote> (Section 2.11), <c> (Section 2.12), <cref>
   (Section 2.16), <dd> (Section 2.18), <dt> (Section 2.21), <em>
   (Section 2.22), <i> (Section 2.27), <li> (Section 2.30), <postamble>
   (Section 2.39), <preamble> (Section 2.40), <refcontent>
   (Section 2.41), <sub> (Section 2.51), <sup> (Section 2.52), <t>
   (Section 2.53), and <tt> (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <tt> elements (Section 2.57)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.51.  <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



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   additive.

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <blockquote> (Section 2.11), <c> (Section 2.12),
   <cref> (Section 2.16), <dd> (Section 2.18), <dt> (Section 2.21), <em>
   (Section 2.22), <i> (Section 2.27), <li> (Section 2.30), <postamble>
   (Section 2.39), <preamble> (Section 2.40), <refcontent>
   (Section 2.41), <strong> (Section 2.50), <t> (Section 2.53), and <tt>
   (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

2.52.  <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.

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <blockquote> (Section 2.11), <c> (Section 2.12),
   <cref> (Section 2.16), <dd> (Section 2.18), <dt> (Section 2.21), <em>
   (Section 2.22), <i> (Section 2.27), <li> (Section 2.30), <postamble>
   (Section 2.39), <preamble> (Section 2.40), <refcontent>
   (Section 2.41), <strong> (Section 2.50), <t> (Section 2.53), and <tt>
   (Section 2.57).



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   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

2.53.  <t>

   Contains a paragraph of text.

   This element appears as child element of: <abstract> (Section 2.1),
   <aside> (Section 2.6), <dd> (Section 2.18), <li> (Section 2.30),
   <list> (Section 3.3), <note> (Section 2.33), and <section>
   (Section 2.46).

   Content model:

   In any order:

   o  Text

   o  <list> elements (Section 3.3)

   o  <ol> elements (Section 2.34)

   o  <ul> elements (Section 2.59)

   o  <dl> elements (Section 2.20)





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   o  <figure> elements (Section 2.25)

   o  <artwork> elements (Section 2.5)

   o  <sourcecode> elements (Section 2.48)

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <spanx> elements (Section 3.4)

   o  <vspace> elements (Section 3.5)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.53.1.  'anchor' attribute

   Document-wide unique identifier for this paragraph.

2.53.2.  'autogeneratedParagraphNumber' attribute

   The number for this paragraph, 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.

2.53.3.  'hangText' attribute

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





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2.54.  <texttable>

   Contains a table, consisting of an optional preamble, a header line,
   rows, an optional postamble, and an optional title.

   The number of columns in the table is determined by the number of
   <ttcol> elements.  The number of rows in the table is determined by
   the number of <c> elements divided by the number of columns.  There
   is no requirement that the number of <c> elements be evenly divisible
   by the number of columns.

   This element appears as child element of: <aside> (Section 2.6), and
   <section> (Section 2.46).

   Content model:

   In this order:

   1.  One optional <titleelement> element (Section 2.56)

   2.  One optional <preamble> element (Section 2.40)

   3.  One or more <ttcol> elements (Section 2.58)

   4.  Optional <c> elements (Section 2.12)

   5.  One optional <postamble> element (Section 2.39)

2.54.1.  'align' attribute

   Determines the horizontal alignment of the table.

   Allowed values:

   o  "left"

   o  "center" (default)

   o  "right"

2.54.2.  'anchor' attribute

   Document-wide unique identifier for this table.

   Furthermore, the presence of this attribute causes the table to be
   numbered.





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2.54.3.  'autogeneratedTableNumber' attribute

   The number for this table, 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.

2.54.4.  'style' attribute

   Selects which borders should be drawn, where

   o  "all" means borders around all table cells,

   o  "full" is like "all" except no horizontal lines between table rows
      (except below the column titles),

   o  "headers" adds just a separator between column titles and rows,
      and

   o  "none" means no borders at all.

   Allowed values:

   o  "all"

   o  "none"

   o  "headers"

   o  "full" (default)

2.54.5.  'suppress-title' attribute

   Tables that have an "anchor" attribute will automatically get an
   autogenerated title (such as "Table 1"), even if the "title"
   attribute is absent.  Setting this attribute to "true" will prevent
   this.

   Allowed values:

   o  "true"

   o  "false" (default)








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2.54.6.  'title' attribute

   Deprecated.  Use <titleelement> instead.

2.55.  <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 child element of: <front> (Section 2.26).

   Content model: only text content.

2.55.1.  'abbrev' attribute

   Specifies an abbreviated variant of the document title.

2.55.2.  'ascii' attribute

   The ASCII equivalent of the title.

2.56.  <titleelement>

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

   This element appears as child element of: <figure> (Section 2.25),
   <section> (Section 2.46), and <texttable> (Section 2.54).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)




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   o  <tt> elements (Section 2.57)

2.57.  <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 child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <blockquote> (Section 2.11), <c> (Section 2.12),
   <cref> (Section 2.16), <dd> (Section 2.18), <dt> (Section 2.21), <em>
   (Section 2.22), <i> (Section 2.27), <li> (Section 2.30), <postamble>
   (Section 2.39), <preamble> (Section 2.40), <refcontent>
   (Section 2.41), <strong> (Section 2.50), <sub> (Section 2.51), <sup>
   (Section 2.52), <t> (Section 2.53), and <titleelement>
   (Section 2.56).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  <strong> elements (Section 2.50)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.22)

   o  <i> elements (Section 2.27)

   o  <sub> elements (Section 2.51)

   o  <sup> elements (Section 2.52)

2.58.  <ttcol>

   Contains a column heading in a table.

   This element appears as child element of: <texttable> (Section 2.54).



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   Content model:

   In any order:

   o  <xref> elements (Section 2.62)

   o  <eref> elements (Section 2.24)

   o  <iref> elements (Section 2.28)

   o  <cref> elements (Section 2.16)

   o  Text

2.58.1.  'align' attribute

   Determines the horizontal alignment within the table column.

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"

2.58.2.  'width' attribute

   The desired column width (as integer 0..100 followed by "%").

2.59.  <ul>

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

   This element appears as child element of: <dd> (Section 2.18), <li>
   (Section 2.30), and <t> (Section 2.53).

   Content model:

   One or more <li> elements (Section 2.30)

2.59.1.  'empty' attribute

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

   Allowed values:



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   o  "false" (default)

   o  "true"

2.59.2.  '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"

2.60.  <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 child element of: <address> (Section 2.2).

   Content model: only text content.

2.61.  <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 2.45.11).

   This element appears as child element of: <front> (Section 2.26).

   Content model: only text content.

2.62.  <xref>

   Inserts a reference to a different part of a document.

   The generated text depends on whether the <xref> is empty (in which



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   case the processor will try to generate a meaningful text fragment),
   and the nature of the referenced document part. [[anchor17: 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 child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <c> (Section 2.12), <cref> (Section 2.16), <dd>
   (Section 2.18), <dt> (Section 2.21), <em> (Section 2.22), <i>
   (Section 2.27), <li> (Section 2.30), <postamble> (Section 2.39),
   <preamble> (Section 2.40), <strong> (Section 2.50), <sub>
   (Section 2.51), <sup> (Section 2.52), <t> (Section 2.53),
   <titleelement> (Section 2.56), <tt> (Section 2.57), and <ttcol>
   (Section 2.58).

   Content model: only text content.

2.62.1.  '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:




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     <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"

      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)

2.62.2.  'pageno' attribute

   Deprecated.

   Allowed values:

   o  "true"

   o  "false" (default)

2.62.3.  'relative' attribute

   Specifies a relative reference from the main target. [[anchor18: Need
   more description here about how this will be displayed.]]

2.62.4.  'section' attribute

   Specifies a section for the generated reference.  For example,




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

   would generate

        See Section 2.3 of [RFC6949] for more information.

2.62.5.  'sectionFormat' attribute

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

   o  "of" (default)

   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.

2.62.6.  '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.







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3.1.  <facsimile>

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

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

   Content model: only text content.

3.2.  <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 child element of: <reference> (Section 2.42).

   Content model: this element does not have any contents.

3.2.1.  'octets' attribute

   Deprecated.

3.2.2.  'target' attribute

   Deprecated.

3.2.3.  'type' attribute (mandatory)

   Deprecated.

3.3.  <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 child element of: <t> (Section 2.53).

   Content model:

   One or more <t> elements (Section 2.53)

3.3.1.  'counter' attribute

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





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3.3.2.  'hangIndent' attribute

   Deprecated.  Use <dl> instead.

3.3.3.  'style' attribute

   Deprecated.

3.4.  <spanx>

   Deprecated.

   This element appears as child element of: <annotation> (Section 2.3),
   <c> (Section 2.12), <postamble> (Section 2.39), <preamble>
   (Section 2.40), and <t> (Section 2.53).

   Content model: only text content.

3.4.1.  'style' attribute

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

3.4.2.  'xml:space' attribute

   Deprecated.

   Allowed values:

   o  "default"

   o  "preserve" (default)

3.5.  <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 child element of: <t> (Section 2.53).

   Content model: this element does not have any contents.







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3.5.1.  '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
   [[anchor19: some other document to be named later when it is
   stable]].

5.  Security Considerations

   The "name" attribute on the <artwork> element (Section 2.5.4) 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

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.








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   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 [RFC3023].

   Encoding considerations:  Identical to those of "application/xml" as
      described in Section 3.2 of [RFC3023].

   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 [RFC3023].

   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
         3.2 of [RFC3023].

      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






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   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

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



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                    <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>.

   [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.

   [RFC3023]        Murata, M., St. Laurent, S., and D. Kohn, "XML Media
                    Types", RFC 3023, January 2001.

   [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.

   [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.




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   [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.

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

   [RFCSTYLE]       Heather, H. and S. Ginoza, "RFC Style Guide",
                    draft-iab-styleguide (work in progress).

   [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>.

   [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/>.




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                    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.

      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.




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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:

      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.






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      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"
   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).



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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:

   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.




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   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
   <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



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   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.

   [[anchor25: Need to think a bit more about using xi:include to
   replace src= for artwork or sourcecode.]]

Appendix C.  Format and Content of RFCs (Future)

   [[[ This section describes the format of RFCs in the future.  The
   section is in this document only temporarily: it soon move to its own
   page on the RFC Editor's web site. ]]]

   The v3 format will be used as part of the new RFC series format
   described in [RFC6949].  RFCs will have multiple representations: the
   canonical document will be in XML using the v3 format, and many non-
   canonical representations (such as HTML and text) will be generated
   as well.

C.1.  Canonical RFCs

   The canonical RFCs will not have any markup that uses a deprecated
   feature.  The processor described in Appendix B will have a "convert
   with warnings" mode that will convert a v2 document to a v3 document
   that converts deprecated features wherever possible, issuing warnings
   for where it cannot convert.  The processor will also have a "strict"
   mode that will issue errors if any deprecated features are in the
   input.

   The canonical format for RFCs have a number of restrictions that the
   RFC Processor needs to enforce before a document can be published in
   its final form.  In this "final" mode, the processor will give a hard
   error when an input XML file has:

   o  any element or attribute listed as "deprecated" in the v3
      vocabulary

   o  XML comments

   o  XML Processor Instructions




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   o  an external DTD

   o  ENTITYs that have a SYSTEM component

   o  <artwork> elements with a "src" attribute that points to a URI
      with a scheme other than "data:"

   o  <cref> elements

   The RFC Processor will have a mode that gives hard errors on all of
   the above other than <cref> elements.  This exception is to allow the
   RPC to insert <cref> elements in the working XML for notes to authors
   in AUTH 48, notes to IANA, and so on.

   The RFC Processor will also generate values for the
   "autogeneratedBoilerplateText" attribute in <rfc>, and
   "autogeneratedSectionNumber", "autogeneratedFigureNumber", and
   "autogeneratedTableNumber" attributes in <section>, <figure>, and
   <texttable> elements, respectively.  These will be filled in by the
   RFC processor so that the canonical XML file has all of the same
   information as the non-canonical representations.

C.2.  Non-canonical RFC Representations

   As described in [RFC6949], the RFC Editor will publish non-canonical
   representations of RFCs.  Those non-canonical representations will be
   derived from the canonical XML.  The generation of these non-
   canonical representations means that there will be much more emphasis
   put on the RFC Processor.

   [[[ Stuff will go on the web page about each non-canonical
   representation. ]]]

Appendix D.  Format and Content of Internet Drafts (Future)

   [[[ This section describes a future where the v3 format will be
   allowed as the input for Internet Draft publication.  The section is
   in this document only temporarily: it will soon move to its own page
   managed by someone yet to be determined. ]]]

   [[[ Description of the transition from the current text format to
   also allowing v3 XML. ]]]

   [[[ Description of what will and won't be allowed in input XML. ]]]







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D.1.  The Draft Processor

   The Draft Processor will handle input differently than the RFC
   Processor.  For example, some XML that is valid for Internet Drafts
   will not be valid for canonical RFCs, so the Draft Processor can be
   set to give warnings for those features but the RFC Processor can be
   set to give hard errors.

   The Draft Processor will help in the transition from the v2 format to
   the v3 format.  A user could request that the Draft Processor convert
   a v2 document to v3, using the new features of v3 where appropriate,
   and removing the parts that are no longer supported.  The processor
   might be able to fully convert a v2 document to v3, or it might have
   to only give advice on some of the v2 features that could not be
   automatically converted.

   The Draft Processor should have a mode that mimics the RFC
   Processor's restictive mode, but that instead gives warnings instead
   of hard errors.  The Draft Processor should also produce interim
   versions of the non-canonical representations so that authors can see
   how their XML might later be rendered; and to convert documents that
   use the v2 format to v3.

D.2.  Processor Instructions

   In the v2 format, XML PIs were used for a wide variety of tasks,
   including changing some formatting of the text outputs, adding
   information to HTML versions of Internet Drafts, and specifying other
   instructions to processors.  In the v3 format, a much smaller set of
   PIs is supported for the Draft Processor and Private Processors.  It
   is important to note that canonical RFCs will not contain any PIs.

   The following PIs will be supported by the Draft Processor:

   o  editing -- When set to "yes", causes the processor to insert
      reference numbers throughout the output files to allow ease of
      referral to particular paragraphs or artwork in the text.  The
      default is "no".

   The following PIs will not be supported by the Draft Processor, but
   are included so that Private Processors have a common way of
   referring to them:

   o  comments -- When set to "yes", causes all <cref> elements to be
      rendered in the output files.  The default is "yes".

   o  linefile -- Causes the processor to emit more detailed information
      about which line of which input file caused an error or warning.



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   Note that a Private Processor can have PIs not from this list.

Appendix E.  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 }?,
       [ 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 }?,



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



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       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 }
   abstract = element abstract { t+ }
   note =
     element note {
       attribute title { text },
       t+
     }



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   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 autogeneratedSectionNumber { text }?,
       titleelement?,
       (t
        | aside
        | blockquote
        | figure
        | texttable
        | iref
        | artwork
        | sourcecode)*,
       section*
     }
   titleelement =
     element titleelement { (text | xref | eref | iref | cref | tt)* }
   t =
     element t {
       attribute anchor { xsd:ID }?,
       attribute hangText { text }?,
       attribute autogeneratedParagraphNumber { text }?,
       (text
        | \list
        | ol
        | ul
        | dl
        | figure
        | artwork
        | sourcecode
        | xref
        | eref
        | iref
        | cref
        | spanx
        | vspace
        | tt
        | strong
        | b
        | em
        | i



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        | sub
        | sup)*
     }
   aside =
     element aside {
       (t | figure | texttable | iref | artwork | sourcecode)*
     }
   blockquote =
     element blockquote {
       attribute anchor { xsd:ID }?,
       attribute cite { text },
       (text
        | figure
        | artwork
        | sourcecode
        | tt
        | strong
        | b
        | em
        | i
        | sub
        | sup)*
     }
   \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 }?,
       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 =



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



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          ol,
          ul,
          dl,
          figure,
          artwork,
          sourcecode,
          xref,
          eref,
          iref,
          cref,
          tt,
          strong,
          b,
          em,
          i,
          sub,
          sup)+
     }
   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 | xref | eref | tt | strong | b | em | i | sub | sup)*



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



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       [ 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 autogeneratedFigureNumber { text }?,
       titleelement?,
       iref*,
       preamble?,
       (artwork | sourcecode)+,
       postamble?
     }
   preamble =
     element preamble {
       (text
        | xref
        | eref
        | iref
        | cref
        | spanx
        | tt
        | strong
        | b
        | em
        | i
        | sub
        | sup)*
     }
   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 }?,



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       [ a:defaultValue = "" ] attribute height { text }?,
       [ a:defaultValue = "en" ] attribute xml:lang { text }?,
       text*
     }
   sourcecode =
     element sourcecode {
       [ a:defaultValue = "" ] attribute name { text }?,
       [ a:defaultValue = "" ] attribute type { text }?,
       text
     }
   postamble =
     element postamble {
       (text
        | xref
        | eref
        | iref
        | cref
        | spanx
        | tt
        | strong
        | b
        | em
        | i
        | sub
        | sup)*
     }
   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" }?,
       attribute autogeneratedTableNumber { text }?,
       titleelement?,
       preamble?,
       ttcol+,
       c*,
       postamble?
     }
   ttcol =
     element ttcol {
       attribute width { text }?,
       [ a:defaultValue = "left" ]
       attribute align { "left" | "center" | "right" }?,



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       (xref | eref | iref | cref | text)*
     }
   c =
     element c {
       (text
        | xref
        | eref
        | iref
        | cref
        | spanx
        | tt
        | strong
        | b
        | em
        | i
        | sub
        | sup)*
     }
   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,
       (seriesInfo | format | refcontent | annotation)*
     }
   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 {
       attribute ascii { text }?,
       (text
        | xref
        | eref
        | iref
        | cref
        | spanx
        | tt
        | strong
        | b
        | em
        | i
        | sub
        | sup)*
     }
   refcontent =
     element refcontent {
       attribute ascii { text }?,
       (text | tt | b | i | em | strong | sub | sup)*
     }
   start = rfc


Appendix F.  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 }?,



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         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"
   + }?,
   +     [ a:defaultValue = "yes" ] attribute tocInclude { "yes" |
   + "no" }?,
   +     [ a:defaultValue = "3" ] attribute tocDepth { text }?,
   +     attribute autogeneratedBoilerplateText { 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*,



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



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   +   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 {
         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 },
         t+
       }
     middle = element middle { section+ }
     section =
       element section {
         attribute anchor { xsd:ID }?,
   -     attribute title { text },



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   +     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 autogeneratedSectionNumber { text }?,
   +     titleelement?,
   +     (t
   +      | aside
   +      | blockquote
   +      | figure
   +      | texttable
   +      | iref
   +      | artwork
   +      | sourcecode)*,
         section*
       }
   + titleelement =
   +   element titleelement { (text | xref | eref | iref | cref | tt)*
   + }
     t =
       element t {
         attribute anchor { xsd:ID }?,
         attribute hangText { text }?,
   +     attribute autogeneratedParagraphNumber { text }?,
         (text
          | \list
   +      | ol
   +      | ul
   +      | dl
          | figure
   +      | artwork
   +      | sourcecode
          | xref
          | eref
          | iref
          | cref
          | spanx
   -      | vspace)*
   +      | vspace
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i



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   +      | sub
   +      | sup)*
   +   }
   + aside =
   +   element aside {
   +     (t | figure | texttable | iref | artwork | sourcecode)*
   +   }
   + blockquote =
   +   element blockquote {
   +     attribute anchor { xsd:ID }?,
   +     attribute cite { text },
   +     (text
   +      | figure
   +      | artwork
   +      | sourcecode
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i
   +      | sub
   +      | sup)*
       }
     \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+
   +   }



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



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   +     | (text,
   +        ol,
   +        ul,
   +        dl,
   +        figure,
   +        artwork,
   +        sourcecode,
   +        xref,
   +        eref,
   +        iref,
   +        cref,
   +        tt,
   +        strong,
   +        b,
   +        em,
   +        i,
   +        sub,
   +        sup)+
   +   }
     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 }?,



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



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         [ 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 autogeneratedFigureNumber { text }?,
   +     titleelement?,
         iref*,
         preamble?,
   -     artwork,
   +     (artwork | sourcecode)+,
         postamble?
       }
     preamble =
   -   element preamble { (text | xref | eref | iref | cref | spanx)* }
   +   element preamble {
   +     (text
   +      | xref
   +      | eref
   +      | iref
   +      | cref
   +      | spanx
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i
   +      | sub
   +      | sup)*
   +   }
     artwork =
       element artwork {
   -     [ a:defaultValue = "preserve" ]



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   -     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 }?,
         text*
       }
   + sourcecode =
   +   element sourcecode {
   +     [ a:defaultValue = "" ] attribute name { text }?,
   +     [ a:defaultValue = "" ] attribute type { text }?,
   +     text
   +   }
     postamble =
   -   element postamble { (text | xref | eref | iref | cref | spanx)*
   +   element postamble {
   +     (text
   +      | xref
   +      | eref
   +      | iref
   +      | cref
   +      | spanx
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i
   +      | sub
   +      | sup)*
     }
     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" }?,
   +     attribute autogeneratedTableNumber { text }?,
   +     titleelement?,



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         preamble?,
         ttcol+,
         c*,
         postamble?
       }
     ttcol =
       element ttcol {
         attribute width { text }?,
         [ a:defaultValue = "left" ]
         attribute align { "left" | "center" | "right" }?,
   -     text
   +     (xref | eref | iref | cref | text)*
   +   }
   + c =
   +   element c {
   +     (text
   +      | xref
   +      | eref
   +      | iref
   +      | cref
   +      | spanx
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i
   +      | sub
   +      | sup)*
   +   }
   + 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,



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






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Index

   A
      abbrev attribute
         in organization element  34
         in title element  55
      abstract element  9
         inside front  28
      address element  9
         inside author  15
      align attribute
         in artwork element  12
         in figure element  26
         in texttable element  53
         in ttcol element  57
      alt attribute
         in artwork element  13
         in figure element  27
      anchor attribute
         in blockquote element  18
         in cref element  21
         in figure element  27
         in reference element  38
         in section element  44
         in t element  52
         in texttable element  53
      annotation element  10
         ascii attribute  11
         inside reference  38
      application/rfc+xml Media Type  64
      area element  11
         inside front  28
      artwork element  11
         align attribute  12
         alt attribute  13
         height attribute  13
         inside aside  14
         inside blockquote  18
         inside section  44
         inside t  52
         name attribute  13
         src attribute  13
         type attribute  13
         width attribute  14
         xml:lang attribute  14
         xml:space attribute  14
      ascii attribute
         in annotation element  11



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         in author element  15
         in city element  19
         in code element  19
         in email element  25
         in organization element  34
         in postalLine element  35
         in refcontent element  38
         in region element  39
         in street element  49
         in title element  55
      asciiname attribute
         in seriesInfo element  46
      asciivalue attribute
         in seriesInfo element  46
      aside element  14
         inside section  44
      Attributes
         abbrev  34, 55
         align  12, 26, 53, 57
         alt  13, 27
         anchor  18, 21, 27, 38, 44, 52-53
         ascii  11, 15, 19, 25, 34-35, 38-39, 49, 55
         asciiname  46
         asciivalue  46
         autogeneratedBoilerplateText  40
         autogeneratedFigureNumber  27
         autogeneratedParagraphNumber  52
         autogeneratedSectionNumber  44
         autogeneratedTableNumber  54
         blankLines  64
         category  40
         cite  18
         consensus  40
         counter  62
         day  21
         docName  40
         empty  57
         format  59
         from  22
         fullname  15
         group  32
         hangIndent  63
         hanging  23
         hangText  52
         height  13, 27
         href  31
         initials  15
         ipr  41



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         iprExtract  42
         item  29
         month  21
         name  13, 46-47
         number  42
         numbered  45
         obsoletes  42
         octets  62
         pageno  60
         primary  30
         rel  31
         relative  60
         removeInRFC  45
         role  16
         section  60
         sectionFormat  61
         seriesNo  42
         sortRefs  42
         source  21
         spacing  23, 32, 58
         src  13, 27
         start  33
         style  33, 54, 63
         subitem  30
         submissionType  42
         suppress-title  27, 54
         surname  16
         symRefs  43
         target  26, 38, 61-62
         title  27, 32, 39, 45, 55
         to  22
         toc  45
         tocDepth  43
         tocInclude  43
         type  13, 47, 62
         updates  43
         value  46
         width  14, 27, 57
         xml:lang  14, 16, 35, 43
         xml:space  14, 63
         year  22
      author element  15
         ascii attribute  15
         fullname attribute  15
         initials attribute  15
         inside front  28
         role attribute  16
         surname attribute  16



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         xml:lang attribute  16
      autogeneratedBoilerplateText attribute
         in rfc element  40
      autogeneratedFigureNumber attribute
         in figure element  27
      autogeneratedParagraphNumber attribute
         in t element  52
      autogeneratedSectionNumber attribute
         in section element  44
      autogeneratedTableNumber attribute
         in texttable element  54

   B
      b element  16
         inside annotation  11
         inside blockquote  18
         inside c  19
         inside cref  20
         inside dt  24
         inside em  25
         inside i  29
         inside postamble  36
         inside preamble  36
         inside refcontent  37
         inside sub  50
         inside sup  51
         inside t  52
         inside tt  56
      back element  17
         inside rfc  40
      bcp14 element  17
      blankLines attribute
         in vspace element  64
      blockquote element  17
         anchor attribute  18
         cite attribute  18
         inside section  44

   C
      c element  18
         inside texttable  53
      category attribute
         in rfc element  40
      cite attribute
         in blockquote element  18
      city element  19
         ascii attribute  19
      code element  19



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         ascii attribute  19
      consensus attribute
         in rfc element  40
      counter attribute
         in list element  62
      country element  20
      cref element  20
         anchor attribute  21
         inside annotation  10
         inside b  16
         inside c  19
         inside dt  24
         inside em  25
         inside i  29
         inside postamble  35
         inside preamble  36
         inside strong  49
         inside sub  50
         inside sup  51
         inside t  52
         inside titleelement  55
         inside tt  56
         inside ttcol  57
         source attribute  21

   D
      date element  21
         day attribute  21
         inside front  28
         month attribute  21
         year attribute  22
      day attribute
         in date element  21
      dd element  22
         inside dl  23
      displayreference element  22
         from attribute  22
         inside back  17
         to attribute  22
      dl element  22
         hanging attribute  23
         inside t  51
         spacing attribute  23
      docName attribute
         in rfc element  40
      dt element  23
         inside dl  23




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   E
      Elements
         abstract  9, 28
         address  9, 15
         annotation  10, 38
         area  11, 28
         artwork  11, 14, 18, 44, 52
         aside  14, 44
         author  15, 28
         b  11, 16, 18-20, 24-25, 29, 36-37, 50-52, 56
         back  17, 40
         bcp14  17
         blockquote  17, 44
         c  18, 53
         city  19
         code  19
         country  20
         cref  10, 16, 19-20, 24-25, 29, 35-36, 49-52, 55-57
         date  21, 28
         dd  22-23
         displayreference  17, 22
         dl  22, 51
         dt  23
         em  11, 17-20, 24, 36-37, 49-52, 56
         email  10, 25
         eref  10, 16, 19-20, 24-25, 29, 35-36, 49-52, 55-57
         facsimile  10, 62
         figure  14, 18, 26, 44, 52
         format  38, 62
         front  28, 38-39
         i  11, 17-20, 24, 28, 36-37, 49-52, 56
         iref  10, 14, 16, 19, 24, 26, 29, 35-36, 44, 49-52, 55-57
         keyword  28, 30
         li  30, 32, 57
         link  30, 39
         list  51, 62
         middle  31, 40
         note  28, 31
         ol  32, 51
         organization  15, 34
         phone  10, 34
         postal  10, 34
         postalLine  35
         postamble  26, 35, 53
         preamble  26, 36, 53
         refcontent  37-38
         reference  38-39
         references  17, 38



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         region  39
         rfc  39
         section  17, 31, 44
         seriesInfo  38, 46
         sourcecode  14, 18, 44, 46, 52
         spanx  10, 19, 35-36, 52, 63
         street  48
         strong  10, 18-20, 24-25, 29, 35-37, 49-52, 56
         sub  11, 17-20, 24-25, 29, 36-37, 49, 52, 56
         sup  11, 17-19, 21, 24-25, 29, 36-37, 49-50, 52, 56
         t  9, 14, 32, 44, 51, 62
         texttable  14, 44, 53
         title  28, 55
         titleelement  26, 44, 53, 55
         tt  10, 16, 18-20, 24-25, 29, 35-37, 49-52, 56
         ttcol  53, 56
         ul  51, 57
         uri  10, 58
         vspace  52, 63
         workgroup  28, 58
         xref  10, 16, 19-20, 24, 29, 35-36, 49-52, 55-58
      em element  24
         inside annotation  11
         inside b  17
         inside blockquote  18
         inside c  19
         inside cref  20
         inside dt  24
         inside postamble  36
         inside preamble  36
         inside refcontent  37
         inside strong  49
         inside sub  50
         inside sup  51
         inside t  52
         inside tt  56
      email element  25
         ascii attribute  25
         inside address  10
      empty attribute
         in ul element  57
      eref element  25
         inside annotation  10
         inside b  16
         inside c  19
         inside cref  20
         inside dt  24
         inside em  24



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         inside i  29
         inside postamble  35
         inside preamble  36
         inside strong  49
         inside sub  50
         inside sup  51
         inside t  52
         inside titleelement  55
         inside tt  56
         inside ttcol  57
         target attribute  26

   F
      facsimile element  62
         inside address  10
      figure element  26
         align attribute  26
         alt attribute  27
         anchor attribute  27
         autogeneratedFigureNumber attribute  27
         height attribute  27
         inside aside  14
         inside blockquote  18
         inside section  44
         inside t  52
         src attribute  27
         suppress-title attribute  27
         title attribute  27
         width attribute  27
      format attribute
         in xref element  59
      format element  62
         inside reference  38
         octets attribute  62
         target attribute  62
         type attribute  62
      from attribute
         in displayreference element  22
      front element  28
         inside reference  38
         inside rfc  39
      fullname attribute
         in author element  15

   G
      group attribute
         in ol element  32




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   H
      hangIndent attribute
         in list element  63
      hanging attribute
         in dl element  23
      hangText attribute
         in t element  52
      height attribute
         in artwork element  13
         in figure element  27
      href attribute
         in link element  31

   I
      i element  28
         inside annotation  11
         inside b  17
         inside blockquote  18
         inside c  19
         inside cref  20
         inside dt  24
         inside postamble  36
         inside preamble  36
         inside refcontent  37
         inside strong  49
         inside sub  50
         inside sup  51
         inside t  52
         inside tt  56
      initials attribute
         in author element  15
      ipr attribute
         '*2026'  72
         '*3667'  71
         '*3978'  71
         '*trust200811'  71
         '*trust200902'  70
         'noDerivativesTrust200902'  70
         'noModificationTrust200902'  70
         'pre5378Trust200902'  71
         'trust200902'  70
         in rfc element  41
      iprExtract attribute
         in rfc element  42
      iref element  29
         inside annotation  10
         inside aside  14
         inside b  16



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         inside c  19
         inside dt  24
         inside em  24
         inside figure  26
         inside i  29
         inside postamble  35
         inside preamble  36
         inside section  44
         inside strong  49
         inside sub  50
         inside sup  51
         inside t  52
         inside titleelement  55
         inside tt  56
         inside ttcol  57
         item attribute  29
         primary attribute  30
         subitem attribute  30
      item attribute
         in iref element  29

   K
      keyword element  30
         inside front  28

   L
      li element  30
         inside ol  32
         inside ul  57
      link element  30
         href attribute  31
         inside rfc  39
         rel attribute  31
      list element  62
         counter attribute  62
         hangIndent attribute  63
         inside t  51
         style attribute  63

   M
      Media Type
         application/rfc+xml  64
      middle element  31
         inside rfc  40
      month attribute
         in date element  21

   N



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      name attribute
         in artwork element  13
         in seriesInfo element  46
         in sourcecode element  47
      note element  31
         inside front  28
         title attribute  32
      number attribute
         in rfc element  42
      numbered attribute
         in section element  45

   O
      obsoletes attribute
         in rfc element  42
      octets attribute
         in format element  62
      ol element  32
         group attribute  32
         inside t  51
         spacing attribute  32
         start attribute  33
         style attribute  33
      organization element  34
         abbrev attribute  34
         ascii attribute  34
         inside author  15

   P
      pageno attribute
         in xref element  60
      phone element  34
         inside address  10
      postal element  34
         inside address  10
         xml:lang attribute  35
      postalLine element  35
         ascii attribute  35
      postamble element  35
         inside figure  26
         inside texttable  53
      preamble element  36
         inside figure  26
         inside texttable  53
      primary attribute
         in iref element  30

   R



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      refcontent element  37
         ascii attribute  38
         inside reference  38
      reference element  38
         anchor attribute  38
         inside references  39
         target attribute  38
      references element  38
         inside back  17
         title attribute  39
      region element  39
         ascii attribute  39
      rel attribute
         in link element  31
      relative attribute
         in xref element  60
      removeInRFC attribute
         in section element  45
      rfc element  39
         autogeneratedBoilerplateText attribute  40
         category attribute  40
         consensus attribute  40
         docName attribute  40
         ipr attribute  41
         iprExtract attribute  42
         number attribute  42
         obsoletes attribute  42
         seriesNo attribute  42
         sortRefs attribute  42
         submissionType attribute  42
         symRefs attribute  43
         tocDepth attribute  43
         tocInclude attribute  43
         updates attribute  43
         xml:lang attribute  43
      role attribute
         in author element  16

   S
      section attribute
         in xref element  60
      section element  44
         anchor attribute  44
         autogeneratedSectionNumber attribute  44
         inside back  17
         inside middle  31
         inside section  44
         numbered attribute  45



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         removeInRFC attribute  45
         title attribute  45
         toc attribute  45
      sectionFormat attribute
         in xref element  61
      seriesInfo element  46
         asciiname attribute  46
         asciivalue attribute  46
         inside reference  38
         name attribute  46
         value attribute  46
      seriesNo attribute
         in rfc element  42
      sortRefs attribute
         in rfc element  42
      source attribute
         in cref element  21
      sourcecode element  46
         inside aside  14
         inside blockquote  18
         inside section  44
         inside t  52
         name attribute  47
         type attribute  47
      spacing attribute
         in dl element  23
         in ol element  32
         in ul element  58
      spanx element  63
         inside annotation  10
         inside c  19
         inside postamble  35
         inside preamble  36
         inside t  52
         style attribute  63
         xml:space attribute  63
      src attribute
         in artwork element  13
         in figure element  27
      start attribute
         in ol element  33
      street element  48
         ascii attribute  49
      strong element  49
         inside annotation  10
         inside blockquote  18
         inside c  19
         inside cref  20



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         inside dt  24
         inside em  25
         inside i  29
         inside postamble  35
         inside preamble  36
         inside refcontent  37
         inside sub  50
         inside sup  51
         inside t  52
         inside tt  56
      style attribute
         in list element  63
         in ol element  33
         in spanx element  63
         in texttable element  54
      sub element  49
         inside annotation  11
         inside b  17
         inside blockquote  18
         inside c  19
         inside cref  20
         inside dt  24
         inside em  25
         inside i  29
         inside postamble  36
         inside preamble  36
         inside refcontent  37
         inside strong  49
         inside t  52
         inside tt  56
      subitem attribute
         in iref element  30
      submissionType attribute
         in rfc element  42
      sup element  50
         inside annotation  11
         inside b  17
         inside blockquote  18
         inside c  19
         inside cref  21
         inside dt  24
         inside em  25
         inside i  29
         inside postamble  36
         inside preamble  36
         inside refcontent  37
         inside strong  49
         inside t  52



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         inside tt  56
      suppress-title attribute
         in figure element  27
         in texttable element  54
      surname attribute
         in author element  16
      symRefs attribute
         in rfc element  43

   T
      t element  51
         anchor attribute  52
         autogeneratedParagraphNumber attribute  52
         hangText attribute  52
         inside abstract  9
         inside aside  14
         inside list  62
         inside note  32
         inside section  44
      target attribute
         in eref element  26
         in format element  62
         in reference element  38
         in xref element  61
      texttable element  53
         align attribute  53
         anchor attribute  53
         autogeneratedTableNumber attribute  54
         inside aside  14
         inside section  44
         style attribute  54
         suppress-title attribute  54
         title attribute  55
      title attribute
         in figure element  27
         in note element  32
         in references element  39
         in section element  45
         in texttable element  55
      title element  55
         abbrev attribute  55
         ascii attribute  55
         inside front  28
      titleelement element  55
         inside figure  26
         inside section  44
         inside texttable  53
      to attribute



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         in displayreference element  22
      toc attribute
         in section element  45
      tocDepth attribute
         in rfc element  43
      tocInclude attribute
         in rfc element  43
      tt element  56
         inside annotation  10
         inside b  16
         inside blockquote  18
         inside c  19
         inside cref  20
         inside dt  24
         inside em  25
         inside i  29
         inside postamble  35
         inside preamble  36
         inside refcontent  37
         inside strong  49
         inside sub  50
         inside sup  51
         inside t  52
         inside titleelement  56
      ttcol element  56
         align attribute  57
         inside texttable  53
         width attribute  57
      type attribute
         in artwork element  13
         in format element  62
         in sourcecode element  47

   U
      ul element  57
         empty attribute  57
         inside t  51
         spacing attribute  58
      updates attribute
         in rfc element  43
      uri element  58
         inside address  10

   V
      value attribute
         in seriesInfo element  46
      vspace element  63
         blankLines attribute  64



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         inside t  52

   W
      width attribute
         in artwork element  14
         in figure element  27
         in ttcol element  57
      workgroup element  58
         inside front  28

   X
      xml:lang attribute
         in artwork element  14
         in author element  16
         in postal element  35
         in rfc element  43
      xml:space attribute
         in artwork element  14
         in spanx element  63
      xref element  58
         format attribute  59
         inside annotation  10
         inside b  16
         inside c  19
         inside cref  20
         inside dt  24
         inside em  24
         inside i  29
         inside postamble  35
         inside preamble  36
         inside strong  49
         inside sub  50
         inside sup  51
         inside t  52
         inside titleelement  55
         inside tt  56
         inside ttcol  57
         pageno attribute  60
         relative attribute  60
         section attribute  60
         sectionFormat attribute  61
         target attribute  61
      xref formats
         counter  59
         default  59
         none  60
         title  60




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   Y
      year attribute
         in date element  22

Author's Address

   Paul Hoffman
   VPN Consortium

   EMail: paul.hoffman@vpnc.org









































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