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Network Working Group                                         P. Hoffman
Internet-Draft                                            VPN Consortium
Obsoletes: 2629 (if approved)                             April 19, 2014
Intended status: Standards Track
Expires: October 21, 2014


                   The 'XML2RFC' version 3 Vocabulary
                        draft-hoffman-xml2rfc-05

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.

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 October 21, 2014.

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
   (http://trustee.ietf.org/license-info) in effect on the date of



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   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>  . . . . . . . . . . . . . . . . . . . . . . . . . 13
     2.7.  <author> . . . . . . . . . . . . . . . . . . . . . . . . . 14
     2.8.  <b>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     2.9.  <back> . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     2.10. <blockquote> . . . . . . . . . . . . . . . . . . . . . . . 16
     2.11. <c>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
     2.12. <city> . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     2.13. <code> . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     2.14. <country>  . . . . . . . . . . . . . . . . . . . . . . . . 18
     2.15. <cref> . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     2.16. <date> . . . . . . . . . . . . . . . . . . . . . . . . . . 19
     2.17. <dd> . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     2.18. <displayreference> . . . . . . . . . . . . . . . . . . . . 21
     2.19. <dl> . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
     2.20. <dt> . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
     2.21. <em> . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
     2.22. <email>  . . . . . . . . . . . . . . . . . . . . . . . . . 24
     2.23. <eref> . . . . . . . . . . . . . . . . . . . . . . . . . . 24
     2.24. <facsimile>  . . . . . . . . . . . . . . . . . . . . . . . 24
     2.25. <figure> . . . . . . . . . . . . . . . . . . . . . . . . . 25
     2.26. <format> . . . . . . . . . . . . . . . . . . . . . . . . . 27
     2.27. <front>  . . . . . . . . . . . . . . . . . . . . . . . . . 27
     2.28. <i>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
     2.29. <iref> . . . . . . . . . . . . . . . . . . . . . . . . . . 28
     2.30. <keyword>  . . . . . . . . . . . . . . . . . . . . . . . . 29



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     2.31. <li> . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
     2.32. <list> . . . . . . . . . . . . . . . . . . . . . . . . . . 30
     2.33. <middle> . . . . . . . . . . . . . . . . . . . . . . . . . 31
     2.34. <note> . . . . . . . . . . . . . . . . . . . . . . . . . . 31
     2.35. <ol> . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
     2.36. <organization> . . . . . . . . . . . . . . . . . . . . . . 33
     2.37. <phone>  . . . . . . . . . . . . . . . . . . . . . . . . . 33
     2.38. <postal> . . . . . . . . . . . . . . . . . . . . . . . . . 34
     2.39. <postalLine> . . . . . . . . . . . . . . . . . . . . . . . 34
     2.40. <postamble>  . . . . . . . . . . . . . . . . . . . . . . . 35
     2.41. <preamble> . . . . . . . . . . . . . . . . . . . . . . . . 35
     2.42. <refcontent> . . . . . . . . . . . . . . . . . . . . . . . 36
     2.43. <reference>  . . . . . . . . . . . . . . . . . . . . . . . 37
     2.44. <references> . . . . . . . . . . . . . . . . . . . . . . . 38
     2.45. <region> . . . . . . . . . . . . . . . . . . . . . . . . . 38
     2.46. <rfc>  . . . . . . . . . . . . . . . . . . . . . . . . . . 38
     2.47. <section>  . . . . . . . . . . . . . . . . . . . . . . . . 43
     2.48. <seriesInfo> . . . . . . . . . . . . . . . . . . . . . . . 45
     2.49. <sourcecode> . . . . . . . . . . . . . . . . . . . . . . . 45
     2.50. <spanx>  . . . . . . . . . . . . . . . . . . . . . . . . . 47
     2.51. <street> . . . . . . . . . . . . . . . . . . . . . . . . . 47
     2.52. <strong> . . . . . . . . . . . . . . . . . . . . . . . . . 48
     2.53. <t>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
     2.54. <texttable>  . . . . . . . . . . . . . . . . . . . . . . . 49
     2.55. <title>  . . . . . . . . . . . . . . . . . . . . . . . . . 51
     2.56. <titleelement> . . . . . . . . . . . . . . . . . . . . . . 52
     2.57. <tt> . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
     2.58. <ttcol>  . . . . . . . . . . . . . . . . . . . . . . . . . 53
     2.59. <ul> . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
     2.60. <uri>  . . . . . . . . . . . . . . . . . . . . . . . . . . 54
     2.61. <vspace> . . . . . . . . . . . . . . . . . . . . . . . . . 55
     2.62. <workgroup>  . . . . . . . . . . . . . . . . . . . . . . . 55
     2.63. <xref> . . . . . . . . . . . . . . . . . . . . . . . . . . 55
   3.  Special Unicode Code Points  . . . . . . . . . . . . . . . . . 58
   4.  Internationalization Considerations  . . . . . . . . . . . . . 59
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 59
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 60
     6.1.  Internet Media Type Registration . . . . . . . . . . . . . 60
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 61
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 61
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 61
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 61
   Appendix A.  Front Page Generation . . . . . . . . . . . . . . . . 63
     A.1.  The /rfc/@category Attribute . . . . . . . . . . . . . . . 63
     A.2.  The /rfc/@ipr Attribute  . . . . . . . . . . . . . . . . . 64
       A.2.1.  Current Values: '*trust200902' . . . . . . . . . . . . 64
       A.2.2.  Historic Values  . . . . . . . . . . . . . . . . . . . 66
   Appendix B.  The v3 Format and Processors  . . . . . . . . . . . . 66



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     B.1.  Including External Text  . . . . . . . . . . . . . . . . . 68
     B.2.  The RFC Processor  . . . . . . . . . . . . . . . . . . . . 69
     B.3.  The Draft Processor  . . . . . . . . . . . . . . . . . . . 69
     B.4.  Processor Instructions . . . . . . . . . . . . . . . . . . 70
   Appendix C.  Relax NG Schema . . . . . . . . . . . . . . . . . . . 70
   Appendix D.  Schema Differences from v2  . . . . . . . . . . . . . 80
   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90












































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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 series will have multiple formats: the canonical
   document will be in XML using the v3 format described here, and many
   non-canonical formats (such as HTML and text) will be generated as
   well.  The generation of these non-canonical formats means that there
   will be much more emphasis put on the processor that handles the XML.
   Features of the expected processor are described in Appendix B.

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

   The following is a hopefully-complete list of all the technical
   changes between [XML2RFCv2] and this document, as welll as the design
   criteria for those changes.  Note that the list is for the current
   version of this document only.  There are additional changes that are
   expected to the v3 vocabulary that are being discussed.  Also note
   that changes to the design choices for the differences are also
   expected.

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
      format 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
   described in [XML2RFCv2].

   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.

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>, and <tt> 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.





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   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.

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>, and <organization>.
      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", "autogeneratedSectionNumber",
      "autogeneratedFigureNumber", and "autogeneratedTableNumber"
      attributes to <rfc>, <section>, <figure>, and <texttable>,
      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 formats.

1.2.3.  Elements and Attributes Deprecated from v2

   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.




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   o  Deprecate <format> because it is not useful and has caused
      surprise for authors in the past.

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

   o  Deprecate the "alt", "height", "src", and "width" 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.

   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 <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
      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.



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1.3.  Syntax Notation

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

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

2.  Elements

   The sections below describe all elements and their attributes.

   Note that attributes not labeled "mandatory" are optional.

   Many elements have an optional "anchor" attribute.  In all cases, the
   value of the "anchor" attribute needs to be a valid XML "Name"
   (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 2.27).

   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:

   In any order:

   o  <postal> elements (Section 2.38)

   o  <phone> elements (Section 2.37)

   o  <facsimile> elements (Section 2.24)




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   o  <email> elements (Section 2.22)

   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 2.43).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <spanx> elements (Section 2.50)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)







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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", but that list will likely change over time.

   This element appears as child element of: <front> (Section 2.27).

   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 formats
   that do not support graphics, and thus ought to contain either a
   "line art" variant of the graphics, or otherwise prose that describes
   the included image in sufficient detail.

   If the artwork includes either "&" or "<" characters, those
   characters either need to be escaped or the artwork needs to be in a
   CDATA structure; 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>.

   This element appears as child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.10), <dd> (Section 2.17), <figure>
   (Section 2.25), <li> (Section 2.31), <section> (Section 2.47), and



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   <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"

2.5.2.  'alt' attribute

   Alternative text description of the artwork (not just the caption).

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]) as well, in which case
   the graphics file is wholly part of the XML file.

   [[anchor8: Add an example of in-lined SVG here.]]







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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 in the non-canonical
   output formats.  If a processor encounters a value for "type" that is
   not one of the preferred values, it can issue a warning but should
   still use the artwork as if it had no "type" attribute.

   The preferred values for <artwork> types are:

   o  ascii-art

   o  call-flow

   o  hex-dump

   o  svg

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

2.5.7.  '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 2.47).




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   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 2.29)

   o  <artwork> elements (Section 2.5)

   o  <sourcecode> elements (Section 2.49)

2.7.  <author>

   Provides information about a document author.

   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".  For RFCs, it is the
   stream that determines who is listed as authors or editors.

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

   This element appears as child element of: <front> (Section 2.27).

   Content model:

   In this order:

   1.  One optional <organization> element (Section 2.36)

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





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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.

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 appears as child element of: <annotation> (Section 2.3),
   <blockquote> (Section 2.10), <c> (Section 2.11), <cref>
   (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.28), <li> (Section 2.31), <postamble>
   (Section 2.40), <preamble> (Section 2.41), <refcontent>
   (Section 2.42), <t> (Section 2.53), and <tt> (Section 2.57).

   Content model:

   In any order:




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   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <tt> elements (Section 2.57)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

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 2.46).

   Content model:

   In this order:

   1.  Optional <displayreference> elements (Section 2.18)

   2.  Optional <references> elements (Section 2.44)

   3.  Optional <section> elements (Section 2.47)

2.10.  <blockquote>

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

   Content model:

   In any order:

   o  Text

   o  <figure> elements (Section 2.25)

   o  <artwork> elements (Section 2.5)




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   o  <sourcecode> elements (Section 2.49)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.10.1.  'anchor' attribute

   Document-wide unique identifier for this quotation.

2.10.2.  'cite' attribute (mandatory)

   The source of the citation.  This must be a URI. [[anchor9: Needs an
   example of a cite for a reference that is already in the spec.]]

2.11.  <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

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <spanx> elements (Section 2.50)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)





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   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.12.  <city>

   Gives the city name in a postal address.

   This element appears as child element of: <postal> (Section 2.38).

   Content model: only text content.

2.13.  <code>

   Gives the postal region code.

   This element appears as child element of: <postal> (Section 2.38).

   Content model: only text content.

2.14.  <country>

   Gives the country in a postal address.

   This element appears as child element of: <postal> (Section 2.38).

   Content model: only text content.

2.15.  <cref>

   Represents a comment.

   Comments can be used in a document while it is work-in-progress.
   They usually appear either inline and visually highlighted, at the
   end of the document (depending on file format and settings of the
   formatter), 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 2.11), <dd> (Section 2.17), <dt>
   (Section 2.20), <em> (Section 2.21), <i> (Section 2.28), <li>
   (Section 2.31), <postamble> (Section 2.40), <preamble>
   (Section 2.41), <strong> (Section 2.52), <t> (Section 2.53),
   <titleelement> (Section 2.56), <tt> (Section 2.57), and <ttcol>
   (Section 2.58).

   Content model:



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   In any order:

   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.15.1.  'anchor' attribute

   Document-wide unique identifier for this comment.

2.15.2.  'source' attribute

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

2.16.  <date>

   Provides information about the publication date.

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

   In the first case, it defines the publication date, which, when
   producing Internet-Drafts, will be used for computing the expiration
   date (see [IDGUIDE]).  When "year", "month" or "day" are left out,
   the processor will attempt to use the current system date if the
   attributes that are specified do match the system date.

   Note 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 second case, the date information will be embedded as-is into
   the reference text.  Therefore, also vague dates ("ca. 2000"), date
   ranges, and so on, are allowed.



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   This element appears as child element of: <front> (Section 2.27).

   Content model: this element does not have any contents.

2.16.1.  'day' attribute

   Day of publication; this is a number.

2.16.2.  'month' attribute

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

2.16.3.  'year' attribute

   Year of publication.

2.17.  <dd>

   The term being defined in a definition list.

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

   Content model:

   Either:

   o  One or more <t> elements (Section 2.53)

   Or:

   o  Text

      One or more <ol> elements (Section 2.35)

      One or more <ul> elements (Section 2.59)

      One or more <dl> elements (Section 2.19)

      One or more <figure> elements (Section 2.25)

      One or more <artwork> elements (Section 2.5)

      One or more <sourcecode> elements (Section 2.49)

      One or more <xref> elements (Section 2.63)

      One or more <eref> elements (Section 2.23)




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      One or more <iref> elements (Section 2.29)

      One or more <cref> elements (Section 2.15)

      One or more <tt> elements (Section 2.57)

      One or more <strong> elements (Section 2.52)

      One or more <b> elements (Section 2.8)

      One or more <em> elements (Section 2.21)

      One or more <i> elements (Section 2.28)

2.18.  <displayreference>

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

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

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

   Content model: this element does not have any contents.

2.18.1.  'from' attribute (mandatory)

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

2.18.2.  'to' attribute (mandatory)

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

2.19.  <dl>

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

   This element appears as child element of: <dd> (Section 2.17), <li>



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   (Section 2.31), and <t> (Section 2.53).

   Content model:

   One or more <dt> elements (Section 2.20)

   One or more <dd> elements (Section 2.17)

2.19.1.  'hanging' attribute

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

   Allowed values:

   o  "false" (default)

   o  "true"

2.19.2.  'spacing' attribute

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

   Allowed values:

   o  "normal" (default)

   o  "compact"

2.20.  <dt>

   The definition part of an entry in a definition list.

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

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.63)





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   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.21.  <em>

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

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <blockquote> (Section 2.10), <c> (Section 2.11),
   <cref> (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <li>
   (Section 2.31), <postamble> (Section 2.40), <preamble>
   (Section 2.41), <refcontent> (Section 2.42), <strong> (Section 2.52),
   <t> (Section 2.53), and <tt> (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)





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   o  <b> elements (Section 2.8)

2.22.  <email>

   Provides an email address.

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

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

   Content model: only text content.

2.22.1.  'ascii' attribute

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

2.23.  <eref>

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

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

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <c> (Section 2.11), <cref> (Section 2.15), <dd>
   (Section 2.17), <dt> (Section 2.20), <em> (Section 2.21), <i>
   (Section 2.28), <li> (Section 2.31), <postamble> (Section 2.40),
   <preamble> (Section 2.41), <strong> (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.

2.23.1.  'target' attribute (mandatory)

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

2.24.  <facsimile>

   Deprecated.




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

   Content model: only text content.

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 2.10), <dd> (Section 2.17), <li>
   (Section 2.31), <section> (Section 2.47), and <t> (Section 2.53).

   Content model:

   In this order:

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

   2.  Optional <iref> elements (Section 2.29)

   3.  One optional <preamble> element (Section 2.41)

   4.  Either:

       *  One or more <artwork> elements (Section 2.5)

   5.  Or:

       *  One or more <sourcecode> elements (Section 2.49)

   6.  One optional <postamble> element (Section 2.40)

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.

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 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.  <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 2.43).

   Content model: this element does not have any contents.

2.26.1.  'octets' attribute

   Deprecated.

2.26.2.  'target' attribute

   Deprecated.

2.26.3.  'type' attribute (mandatory)

   Deprecated.

2.27.  <front>

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

   This element appears as child element of: <reference> (Section 2.43),
   and <rfc> (Section 2.46).

   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 2.16)

   4.  Optional <area> elements (Section 2.4)

   5.  Optional <workgroup> elements (Section 2.62)

   6.  Optional <keyword> elements (Section 2.30)

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





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   8.  Optional <note> elements (Section 2.34)

2.28.  <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 2.10), <c> (Section 2.11),
   <cref> (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <li>
   (Section 2.31), <postamble> (Section 2.40), <preamble>
   (Section 2.41), <refcontent> (Section 2.42), <strong> (Section 2.52),
   <t> (Section 2.53), and <tt> (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

2.29.  <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".




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   This element appears as child element of: <annotation> (Section 2.3),
   <aside> (Section 2.6), <b> (Section 2.8), <c> (Section 2.11), <dd>
   (Section 2.17), <dt> (Section 2.20), <em> (Section 2.21), <figure>
   (Section 2.25), <i> (Section 2.28), <li> (Section 2.31), <postamble>
   (Section 2.40), <preamble> (Section 2.41), <section> (Section 2.47),
   <strong> (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.

2.29.1.  'item' attribute (mandatory)

   The item to include.

2.29.2.  '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)

2.29.3.  'subitem' attribute

   The subitem to include.

2.30.  <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 formats.

   This element appears as child element of: <front> (Section 2.27).

   Content model: only text content.

2.31.  <li>

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

   This element appears as child element of: <ol> (Section 2.35), and



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   <ul> (Section 2.59).

   Content model:

   Either:

   o  One or more <t> elements (Section 2.53)

   Or:

   o  Text

      One or more <ol> elements (Section 2.35)

      One or more <ul> elements (Section 2.59)

      One or more <dl> elements (Section 2.19)

      One or more <figure> elements (Section 2.25)

      One or more <artwork> elements (Section 2.5)

      One or more <sourcecode> elements (Section 2.49)

      One or more <xref> elements (Section 2.63)

      One or more <eref> elements (Section 2.23)

      One or more <iref> elements (Section 2.29)

      One or more <cref> elements (Section 2.15)

      One or more <tt> elements (Section 2.57)

      One or more <strong> elements (Section 2.52)

      One or more <b> elements (Section 2.8)

      One or more <em> elements (Section 2.21)

      One or more <i> elements (Section 2.28)

2.32.  <list>

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




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

   Content model:

   One or more <t> elements (Section 2.53)

2.32.1.  'counter' attribute

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

2.32.2.  'hangIndent' attribute

   Deprecated.

2.32.3.  'style' attribute

   Deprecated.

2.33.  <middle>

   Represents the main content of the document.

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

   Content model:

   One or more <section> elements (Section 2.47)

2.34.  <note>

   Creates an unnumbered section that appears after the abstract.

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

   This element appears as child element of: <front> (Section 2.27).

   Content model:

   One or more <t> elements (Section 2.53)

2.34.1.  'title' attribute (mandatory)

   The title of the note.





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2.35.  <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 2.17), <li>
   (Section 2.31), and <t> (Section 2.53).

   Content model:

   One or more <li> elements (Section 2.31)

2.35.1.  '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"

2.35.2.  'start' attribute

   The ordinal value to start the list at.  This defaults to "1".

2.35.3.  '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, ...)

   [[anchor10: 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



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   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.

2.36.  <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.

2.36.1.  'abbrev' attribute

   Abbreviated variant.

2.36.2.  'ascii' attribute

   The ASCII equivalent of the organization's name.

2.37.  <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"



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   syntax.  See Section 3 of [RFC3966] for details.

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

   Content model: only text content.

2.38.  <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:

   Either:

   o  In any order:

      *  <street> elements (Section 2.51)

      *  <city> elements (Section 2.12)

      *  <region> elements (Section 2.45)

      *  <code> elements (Section 2.13)

      *  <country> elements (Section 2.14)

   Or:

   o  One or more <postalLine> elements (Section 2.39)

2.38.1.  'xml:lang' attribute

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

2.39.  <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 2.38).




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   Content model: only text content.

2.40.  <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 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <spanx> elements (Section 2.50)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.41.  <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




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   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <spanx> elements (Section 2.50)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.42.  <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>
     <innerRefContent>Self-published pamphlet</innerRefContent>
   </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 2.43).

   Content model:

   In any order:




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   o  Text

   o  <tt> elements (Section 2.57)

   o  <b> elements (Section 2.8)

   o  <i> elements (Section 2.28)

   o  <em> elements (Section 2.21)

   o  <strong> elements (Section 2.52)

2.43.  <reference>

   Represents a bibliographical reference.

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

   Content model:

   In this order:

   1.  One <front> element (Section 2.27)

   2.  In any order:

       *  <seriesInfo> elements (Section 2.48)

       *  <format> elements (Section 2.26)

       *  <refcontent> elements (Section 2.42)

       *  <annotation> elements (Section 2.3)

2.43.1.  '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.

2.43.2.  '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).



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2.44.  <references>

   Contains a set of bibliographical references.

   In the early days of the RFC series, there was only one "References"
   section per RFC.  This convention was later changed to group
   references into two sets, "Normative" and "Informative" as described
   in [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 2.43)

2.44.1.  'title' attribute

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

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

2.45.  <region>

   Provides the region name in a postal address.

   This element appears as child element of: <postal> (Section 2.38).

   Content model: only text content.

2.46.  <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 <front> element (Section 2.27)




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   2.  One <middle> element (Section 2.33)

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

2.46.1.  '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.

2.46.2.  'category' attribute

   Document category (see Appendix A.1).

   Allowed values:

   o  "std"

   o  "bcp"

   o  "info"

   o  "exp"

   o  "historic"

2.46.3.  'consensus' attribute

   Affects the generated boilerplate.

   See [RFC5741] for more information.

   Allowed values:

   o  "no"

   o  "yes"

2.46.4.  'docName' attribute

   For Internet-Drafts, this specifies the draft name (which appears
   below the title).

   Note that the file extension is not part of the draft, so in general
   it should end with the current draft number ("-", plus two digits).

   Furthermore, it is good practice to disambiguate current editor



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   copies from submitted drafts (for instance, by replacing the draft
   number with the string "latest").

   See [IDGUIDE] for further information.

2.46.5.  '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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2.46.6.  'iprExtract' attribute

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

2.46.7.  'number' attribute

   The number of the RFC to be produced.

2.46.8.  '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 format,
   hyperlinks can be generated.  Also, the value ought to be reformatted
   to insert whitespace after each comma if not already present.

2.46.9.  'seriesNo' attribute

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

2.46.10.  'sortRefs' attribute

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

   Allowed values:

   o  "yes"

   o  "no" (default)

2.46.11.  'submissionType' attribute

   The document stream.

   See Section 2 of [RFC5741] for details.

   Allowed values:

   o  "IETF" (default)

   o  "IAB"





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   o  "IRTF"

   o  "independent"

2.46.12.  '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"

2.46.13.  'tocDepth' attribute

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

2.46.14.  'tocInclude' attribute

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

   Allowed values:

   o  "yes" (default)

   o  "no"

2.46.15.  '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 format,
   hyperlinks can be generated.  Also, the value ought to be reformatted
   to insert whitespace after each comma if not already present.

2.46.16.  '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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2.47.  <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 2.33), and <section> (Section 2.47).

   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)

       *  <figure> elements (Section 2.25)

       *  <texttable> elements (Section 2.54)

       *  <iref> elements (Section 2.29)

       *  <artwork> elements (Section 2.5)

       *  <sourcecode> elements (Section 2.49)

   3.  Optional <section> elements (Section 2.47)

2.47.1.  'anchor' attribute

   Document-wide unique identifier for this section.

2.47.2.  '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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2.47.3.  '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"

2.47.4.  '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)

2.47.5.  'title' attribute

   Deprecated.  Use <titleelement> instead.

2.47.6.  '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)

2.48.  <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 2.43).

   Content model: this element does not have any contents.

2.48.1.  '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".

2.48.2.  '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).

2.49.  <sourcecode>

   This element allows the inclusion of sourcecode into the document.

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

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

   A common problem authors have with <sourcecode> is that the XML
   processor returns errors if the text in the artwork contains either
   the "&" or "<" character.  To avoid these problems, the artwork needs
   to be surrounded in a CDATA structure: "<![CDATA[]]".  For example:

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

   Instead of using a CDATA structure, the authour could instead escape



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   the "&" and "<" characters as "&amp;" and "&lt;".

   This element appears as child element of: <aside> (Section 2.6),
   <blockquote> (Section 2.10), <dd> (Section 2.17), <figure>
   (Section 2.25), <li> (Section 2.31), <section> (Section 2.47), and
   <t> (Section 2.53).

   Content model: only text content.

2.49.1.  '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).

2.49.2.  '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 in the non-
   canonical output formats.  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:

   o  abnf

   o  asn.1

   o  bash

   o  c++

   o  c

   o  cbor

   o  dtd

   o  java

   o  javascript





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   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.

2.50.  <spanx>

   Deprecated.  Use <b>, <i>, and <tt> instead.

   This element appears as child element of: <annotation> (Section 2.3),
   <c> (Section 2.11), <postamble> (Section 2.40), <preamble>
   (Section 2.41), and <t> (Section 2.53).

   Content model: only text content.

2.50.1.  'style' attribute

   Deprecated.

2.50.2.  'xml:space' attribute

   Deprecated.

   Allowed values:

   o  "default"

   o  "preserve" (default)

2.51.  <street>

   Provides a street address.

   This element appears as child element of: <postal> (Section 2.38).



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   Content model: only text content.

2.52.  <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 appears as child element of: <annotation> (Section 2.3),
   <blockquote> (Section 2.10), <c> (Section 2.11), <cref>
   (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.28), <li> (Section 2.31), <postamble>
   (Section 2.40), <preamble> (Section 2.41), <refcontent>
   (Section 2.42), <t> (Section 2.53), and <tt> (Section 2.57).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <tt> elements (Section 2.57)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

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 2.17), <li> (Section 2.31),
   <list> (Section 2.32), <note> (Section 2.34), and <section>
   (Section 2.47).

   Content model:

   In any order:




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   o  Text

   o  <list> elements (Section 2.32)

   o  <ol> elements (Section 2.35)

   o  <ul> elements (Section 2.59)

   o  <dl> elements (Section 2.19)

   o  <figure> elements (Section 2.25)

   o  <artwork> elements (Section 2.5)

   o  <sourcecode> elements (Section 2.49)

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <spanx> elements (Section 2.50)

   o  <vspace> elements (Section 2.61)

   o  <tt> elements (Section 2.57)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.53.1.  'anchor' attribute

   Document-wide unique identifier for this paragraph.

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



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   <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 2.47).

   Content model:

   In this order:

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

   2.  One optional <preamble> element (Section 2.41)

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

   4.  Optional <c> elements (Section 2.11)

   5.  One optional <postamble> element (Section 2.40)

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.

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.




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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)

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's long (~40 characters), the "abbrev" attribute is used to specify



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   an abbreviated variant.

   This element appears as child element of: <front> (Section 2.27).

   Content model: only text content.

2.55.1.  'abbrev' attribute

   Specifies an abbreviated variant of the document 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 2.47), and <texttable> (Section 2.54).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <tt> elements (Section 2.57)

2.57.  <tt>

   Causes the text to be displayed in a constant-width font.

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <blockquote> (Section 2.10), <c> (Section 2.11),
   <cref> (Section 2.15), <dd> (Section 2.17), <dt> (Section 2.20), <em>
   (Section 2.21), <i> (Section 2.28), <li> (Section 2.31), <postamble>
   (Section 2.40), <preamble> (Section 2.41), <refcontent>
   (Section 2.42), <strong> (Section 2.52), <t> (Section 2.53), and
   <titleelement> (Section 2.56).

   Content model:



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   In any order:

   o  Text

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  <strong> elements (Section 2.52)

   o  <b> elements (Section 2.8)

   o  <em> elements (Section 2.21)

   o  <i> elements (Section 2.28)

2.58.  <ttcol>

   Contains a column heading in a table.

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

   Content model:

   In any order:

   o  <xref> elements (Section 2.63)

   o  <eref> elements (Section 2.23)

   o  <iref> elements (Section 2.29)

   o  <cref> elements (Section 2.15)

   o  Text

2.58.1.  'align' attribute

   Determines the horizontal alignment within the table column.

   Allowed values:

   o  "left" (default)




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   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 2.17), <li>
   (Section 2.31), and <t> (Section 2.53).

   Content model:

   One or more <li> elements (Section 2.31)

2.59.1.  'empty' attribute

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

   Allowed values:

   o  "false" (default)

   o  "true"

2.59.2.  '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]).



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

   Content model: only text content.

2.61.  <vspace>

   Deprecated.

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

   Content model: this element does not have any contents.

2.61.1.  'blankLines' attribute

   Deprecated.

2.62.  <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 2.46.11).

   This element appears as child element of: <front> (Section 2.27).

   Content model: only text content.

2.63.  <xref>

   Inserts a reference to a different part of a document.

   The generated text depends on whether the <xref> is empty (in which
   case the processor will try to generate a meaningful text fragment),
   and the nature of the referenced document part. [[anchor11: Need to
   say more about the processor output if the element is empyt 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



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   what is being referred to.

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.8), <c> (Section 2.11), <cref> (Section 2.15), <dd>
   (Section 2.17), <dt> (Section 2.20), <em> (Section 2.21), <i>
   (Section 2.28), <li> (Section 2.31), <postamble> (Section 2.40),
   <preamble> (Section 2.41), <strong> (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.

2.63.1.  'format' attribute

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

   "counter"

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

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

      might generate

     See Section 1.7 for an overview.

   "default"

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

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

      might generate

     See Section 1.7 for an overview.

   "none"





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      This attribute value is deprecated.

   "title"

      This attribute value is deprecated.

   Allowed values:

   o  "counter"

   o  "title"

   o  "none"

   o  "default" (default)

2.63.2.  'pageno' attribute

   Deprecated.

   Allowed values:

   o  "true"

   o  "false" (default)

2.63.3.  'relative' attribute

   Specifies a relative reference from the main target. [[anchor12: Need
   more description here about how this will be displayed.]]

2.63.4.  'section' attribute

   Specifies a section for the generated reference.  For example,

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

   would generate

        See Section 2.3 of [RFC6949] for more information.

2.63.5.  'sectionFormat' attribute

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

   o  "of" (default)




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   o  "comma"

   o  "parens"

   For example:

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

   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.

2.63.6.  '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.  Special Unicode Code Points

   Although the current RFC format does not allow non-ASCII Unicode
   characters ([UNICODE]), some of them can be used to enforce certain
   behaviors of formatters.

   For instance:

   non-breaking space (U+00A0)

      Represents a space character where no line break should happen.
      This is frequenly used in titles (by excluding certain space
      characters from the line breaking algorithm, the processor will
      use the remaining whitespace ocurrences for line breaks).

   non-breaking hyphen (U+2011)

      Similarly, this represents a hyphen character where nevertheless
      no line breaking ought to occur.

   word joiner (U+2060)




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      Also called "zero width non-breaking space".  This can be used to
      disallow line breaking between two non-whitespace characters.

   Note that in order to use these characters by name, they need to be
   declared either in the Document Type Definition (DTD, [XML], Section
   2.9), or in the "internal subset" ([XML], Section 2.8), like this:

   <?xml version="1.0"?>

   <!DOCTYPE rfc [

     <!-- declare nbsp and friends -->
     <!ENTITY nbsp    "&#xa0;">
     <!ENTITY nbhy    "&#x2011;">
     <!ENTITY wj      "&#x2060;">
   ]>

4.  Internationalization Considerations

   This format is based on [XML], thus does not have any issues
   representing arbitrary Unicode [UNICODE] characters in text content.

   However, the current canonical RFC format is restricted to US-ASCII
   [USASCII] characters ([RFC2223], Section 3).  Future versions are
   likely to relax this role, and it is expected that the vocabulary
   will be extended so that US-ASCII alternatives can be provided when
   that makes sense (for instance, in contact information).

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 probalby
   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.

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




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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.

   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 either
      transform xml2rfc to output formats 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 uses 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].





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      File extension(s):  .xml

      Macintosh file type code(s):  TEXT

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

   Intended usage:  COMMON

   Restrictions on usage:  N/A

   Author:  See Authors Section.

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

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" formatter.

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 <http://www.w3.org/TR/xml>.

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



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                <http://www.ietf.org/id-info/guidelines.html>.

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

   [RFC2223]    Postel, J. and J. Reynolds, "Instructions to RFC
                Authors", RFC 2223, October 1997.

   [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.

   [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).




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

   [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/>.

   [USASCII]    American National Standards Institute, "Coded Character
                Set -- 7-bit American Standard Code for Information
                Interchange", ANSI X3.4, 1986.

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

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

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

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

Appendix A.  Front Page Generation

A.1.  The /rfc/@category Attribute

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



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   "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.

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):








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   +----------+--------------------------------+
   | 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.

      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,



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      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).

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

   As described in [RFC6949], the v3 format will be the format for
   canonical RFCs.  The format will also likely be allowed for
   submission of Internet Drafts.  The format for both of these tasks is
   the same; however, software processing an XML file for creation of an



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   Internet Draft will act differently than it will for creation of what
   is expected to be an RFC.

   This section describes topics that ares 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.

   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 most work from the RNG, not from a DTD.  In fact, the
   author believes that 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 validate
      the contents of the intended RFC and to create the non-canonical
      formats that will be published by the RFC Editor.

   o  Draft Processor -- The processor used by the IETF to validate the
      contents of XML that is submitted and to create the other formats
      that will be supported for Internet Drafts; to produce interim
      versions of the non-canonical formats so that authors can see how
      their XML might later be rendered; and to convert documents that
      use the v2 format to v3.

   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 formats so that
      authors can see how their XML might later be rendered; to create
      documents in formats different than those supported by the RFC
      Editor; and to convert XML that has external information into XML
      that has that external information included.

   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.  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.  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.

   Users of current and older XML processors for Internet Drafts and
   RFCs may be used to them having unhelpful error messages.  Beginning
   with v3, the RFC Processor and Draft Processor will have much better



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   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.

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 format, 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 is done from
   xml.resource.org, but later is expected to be from the RFC Editor.
   For example, if a document has three normative refernces, all RFCs,
   the document might contain:

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

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

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

   [[anchor18: Need to think a bit more about using xi:include to
   replace src= for artwork or sourcecode.]]






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B.2.  The RFC Processor

   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 (PIs)

   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 also have a mode that gives hard errors on all
   of the above other than <cref> elements.  This 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
   "autogeneratedBoilerplateText", "autogeneratedSectionNumber",
   "autogeneratedFigureNumber", and "autogeneratedTableNumber"
   attributes in <rfc>, <section>, <figure>, and <texttable>,
   respectively.

B.3.  The Draft Processor

   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 warningis instead
   of hard errors.




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B.4.  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 ot "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.

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

Appendix C.  Relax NG Schema

   The following is the RelaxNG schema for the v3 format.


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

   rfc =
     element rfc {
       attribute number { text }?,
       [ a:defaultValue = "" ] attribute obsoletes { text }?,
       [ a:defaultValue = "" ] attribute updates { text }?,
       attribute category { "std" | "bcp" | "info" | "exp" | "historic"
   }?,
       attribute consensus { "no" | "yes" }?,
       attribute seriesNo { text }?,
       attribute ipr {
         "full2026"
         | "noDerivativeWorks2026"
         | "none"



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         | "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 }?,
       front,
       middle,
       back?
     }
   front =
     element front {
       title, author+, date?, area*, workgroup*, keyword*, abstract?,
   note*
     }
   title =
     element title {
       attribute abbrev { text }?,
       text
     }
   author =
     element author {
       attribute initials { text }?,
       attribute surname { text }?,
       attribute fullname { text }?,
       attribute role { "editor" }?,
       [ a:defaultValue = "en" ] attribute xml:lang { text }?,



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       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 { text }
   city = element city { text }
   region = element region { text }
   code = element code { text }
   country = element country { text }
   postalLine = element postalLine { 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+
     }
   middle = element middle { section+ }



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



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



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       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)*
     }
   dd =
     element dd {
       t+
       | (text,
          ol,
          ul,
          dl,
          figure,
          artwork,
          sourcecode,
          xref,
          eref,
          iref,
          cref,
          tt,
          strong,
          b,
          em,
          i)+
     }
   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 {



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



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       [ 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)*
     }
   artwork =
     element artwork {
       attribute xml:space { text }?,
       [ a:defaultValue = "" ] attribute name { text }?,
       [ a:defaultValue = "" ] attribute type { text }?,
       attribute src { text }?,
       [ a:defaultValue = "left" ]
       attribute align { "left" | "center" | "right" }?,
       [ a:defaultValue = "" ] attribute alt { text }?,
       [ a:defaultValue = "" ] attribute width { text }?,
       [ a:defaultValue = "" ] attribute height { text }?,
       [ a:defaultValue = "en" ] attribute xml:lang { text }?,
       text*
     }
   sourcecode =
     element sourcecode {
       [ a:defaultValue = "" ] attribute name { text }?,
       [ a:defaultValue = "" ] attribute type { text }?,
       text
     }
   postamble =
     element postamble {
       (text
        | xref
        | eref
        | iref



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        | cref
        | spanx
        | tt
        | strong
        | b
        | em
        | i)*
     }
   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" }?,
       (xref | eref | iref | cref | text)*
     }
   c =
     element c {
       (text
        | xref
        | eref
        | iref
        | cref
        | spanx
        | tt
        | strong
        | b
        | em
        | i)*
     }
   back = element back { displayreference*, references*, section* }
   displayreference =



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     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 },
       empty
     }
   format =
     element format {
       attribute target { text }?,
       attribute type { text },
       attribute octets { text }?,
       empty
     }
   annotation =
     element annotation {
       (text
        | xref
        | eref
        | iref
        | cref
        | spanx
        | tt
        | strong
        | b
        | em
        | i)*
     }
   refcontent = element refcontent { (text | tt | b | i | em | strong)*
   }
   start = rfc





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Appendix D.  Schema Differences from v2

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


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

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



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   +     [ a:defaultValue = "yes" ] attribute tocInclude { "yes" |
   + "no" }?,
   +     [ a:defaultValue = "3" ] attribute tocDepth { text }?,
   +     attribute autogeneratedBoilerplateText { text }?,
         front,
         middle,
         back?
       }
     front =
       element front {
   -     title, author+, date, area*, workgroup*, keyword*, abstract?,
   - note*
   +     title, author+, date?, area*, workgroup*, keyword*,
   + abstract?, note*
       }
     title =
       element title {
         attribute abbrev { text }?,
         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 { street+, (city | region | code |
   - country)* }
   + address =
   +   element address { (postal | phone | facsimile | email | uri)* }
   + postal =
   +   element postal {
   +     [ a:defaultValue = "en" ] attribute xml:lang { text }?,
   +     ((street | city | region | code | country)* | postalLine+)
   +   }



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     street = element street { text }
     city = element city { text }
     region = element region { text }
     code = element code { text }
     country = element country { text }
   + postalLine = element postalLine { 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 },
   +     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 | figure | texttable | iref | artwork |
   + sourcecode)*,



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         section*
       }
   + titleelement =
   +   element titleelement { (text | xref | eref | iref | cref | tt)*
   + }
     t =
       element t {
         attribute anchor { xsd:ID }?,
   -     attribute hangText { text }?,
         (text
          | \list
   +      | ol
   +      | ul
   +      | dl
          | figure
   +      | artwork
   +      | sourcecode
          | xref
          | eref
          | iref
          | cref
          | spanx
   -      | vspace)*
   +      | vspace
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i)*
   +   }
   + 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)*
       }
     \list =
       element list {
   -     attribute style { text }?,
   +     [ a:defaultValue = "empty" ] attribute style { text }?,
         attribute hangIndent { text }?,
         attribute counter { text }?,
         t+



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       }
   + ol =
   +   element ol {
   +     [ a:defaultValue = "1" ] attribute style { text }?,
   +     [ a:defaultValue = "1" ] attribute start { text }?,
   +     [ a:defaultValue = "normal" ]
   +     attribute spacing { "normal" | "compact" }?,
   +     li+
   +   }
   + ul =
   +   element ul {
   +     [ a:defaultValue = "normal" ]
   +     attribute spacing { "normal" | "compact" }?,
   +     [ a:defaultValue = "false" ] attribute empty { "false" |
   + "true" }?,
   +     li+
   +   }
   + li =
   +   element li {
   +     t+
   +     | (text,
   +        ol,
   +        ul,
   +        dl,
   +        figure,
   +        artwork,
   +        sourcecode,
   +        xref,
   +        eref,
   +        iref,
   +        cref,
   +        tt,
   +        strong,
   +        b,
   +        em,
   +        i)+
   +   }
   + 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)*



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   +   }
   + dd =
   +   element dd {
   +     t+
   +     | (text,
   +        ol,
   +        ul,
   +        dl,
   +        figure,
   +        artwork,
   +        sourcecode,
   +        xref,
   +        eref,
   +        iref,
   +        cref,
   +        tt,
   +        strong,
   +        b,
   +        em,
   +        i)+
   +   }
     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 =



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



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   -     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)*
   +   }
     artwork =
       element artwork {
   -     [ a:defaultValue = "preserve" ]
   -     attribute xml:space { "default" | "preserve" }?,
   +     attribute xml:space { text }?,
         [ a:defaultValue = "" ] attribute name { text }?,
         [ a:defaultValue = "" ] attribute type { text }?,
         attribute src { text }?,
         [ a:defaultValue = "left" ]
         attribute align { "left" | "center" | "right" }?,
         [ a:defaultValue = "" ] attribute alt { text }?,
         [ a:defaultValue = "" ] attribute width { text }?,
         [ a:defaultValue = "" ] attribute height { text }?,
   +     [ a:defaultValue = "en" ] attribute xml:lang { text }?,
         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



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   +      | cref
   +      | spanx
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i)*
     }
     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" }?,
   -     text
   +     (xref | eref | iref | cref | text)*
   +   }
   + c =
   +   element c {
   +     (text
   +      | xref
   +      | eref
   +      | iref
   +      | cref
   +      | spanx
   +      | tt
   +      | strong
   +      | b
   +      | em
   +      | i)*
   +   }
   + back = element back { displayreference*, references*, section* }



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



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   +      | em
   +      | i)*
   +   }
   + refcontent = element refcontent { (text | tt | b | i | em |
   + strong)* }
     start = rfc


Index

   A
      abbrev attribute
         in organization element  33
         in title element  52
      abstract element  9
         inside front  27
      address element  9
         inside author  14
      align attribute
         in artwork element  12
         in figure element  25
         in texttable element  50
         in ttcol element  53
      alt attribute
         in artwork element  12
         in figure element  26
      anchor attribute
         in blockquote element  17
         in cref element  19
         in figure element  26
         in reference element  37
         in section element  43
         in t element  49
         in texttable element  50
      annotation element  10
         inside reference  37
      application/rfc+xml Media Type  60
      area element  11
         inside front  27
      artwork element  11
         align attribute  12
         alt attribute  12
         height attribute  12
         inside aside  14
         inside blockquote  16
         inside dd  20
         inside figure  25
         inside li  30



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         inside section  43
         inside t  49
         name attribute  12
         src attribute  12
         type attribute  13
         width attribute  13
         xml:lang attribute  13
         xml:space attribute  13
      ascii attribute
         in author element  15
         in email element  24
         in organization element  33
      aside element  13
         inside section  43
      Attributes
         abbrev  33, 52
         align  12, 25, 50, 53
         alt  12, 26
         anchor  17, 19, 26, 37, 43, 49-50
         ascii  15, 24, 33
         autogeneratedBoilerplateText  39
         autogeneratedFigureNumber  26
         autogeneratedSectionNumber  43
         autogeneratedTableNumber  50
         blankLines  55
         category  39
         cite  17
         consensus  39
         counter  31
         day  20
         docName  39
         empty  54
         format  56
         from  21
         fullname  15
         hangIndent  31
         hanging  22
         height  12, 26
         initials  15
         ipr  40
         iprExtract  41
         item  29
         month  20
         name  12, 45-46
         number  41
         numbered  44
         obsoletes  41
         octets  27



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         pageno  57
         primary  29
         relative  57
         removeInRFC  44
         role  15
         section  57
         sectionFormat  57
         seriesNo  41
         sortRefs  41
         source  19
         spacing  22, 32, 54
         src  12, 26
         start  32
         style  31-32, 47, 51
         subitem  29
         submissionType  41
         suppress-title  26, 51
         surname  15
         symRefs  42
         target  24, 27, 37, 58
         title  26, 31, 38, 44, 51
         to  21
         toc  44
         tocDepth  42
         tocInclude  42
         type  13, 27, 46
         updates  42
         value  45
         width  13, 26, 54
         xml:lang  13, 15, 34, 42
         xml:space  13, 47
         year  20
      author element  14
         ascii attribute  15
         fullname attribute  15
         initials attribute  15
         inside front  27
         role attribute  15
         surname attribute  15
         xml:lang attribute  15
      autogeneratedBoilerplateText attribute
         in rfc element  39
      autogeneratedFigureNumber attribute
         in figure element  26
      autogeneratedSectionNumber attribute
         in section element  43
      autogeneratedTableNumber attribute
         in texttable element  50



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   B
      b element  15
         inside annotation  10
         inside blockquote  17
         inside c  18
         inside cref  19
         inside dd  21
         inside dt  23
         inside em  24
         inside i  28
         inside li  30
         inside postamble  35
         inside preamble  36
         inside refcontent  37
         inside t  49
         inside tt  53
      back element  16
         inside rfc  39
      blankLines attribute
         in vspace element  55
      blockquote element  16
         anchor attribute  17
         cite attribute  17

   C
      c element  17
         inside texttable  50
      category attribute
         in rfc element  39
      cite attribute
         in blockquote element  17
      city element  18
         inside postal  34
      code element  18
         inside postal  34
      consensus attribute
         in rfc element  39
      counter attribute
         in list element  31
      country element  18
         inside postal  34
      cref element  18
         anchor attribute  19
         inside annotation  10
         inside b  16
         inside c  17
         inside dd  21
         inside dt  23



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         inside em  23
         inside i  28
         inside li  30
         inside postamble  35
         inside preamble  36
         inside strong  48
         inside t  49
         inside titleelement  52
         inside tt  53
         inside ttcol  53
         source attribute  19

   D
      date element  19
         day attribute  20
         inside front  27
         month attribute  20
         year attribute  20
      day attribute
         in date element  20
      dd element  20
         inside dl  22
      displayreference element  21
         from attribute  21
         inside back  16
         to attribute  21
      dl element  21
         hanging attribute  22
         inside dd  20
         inside li  30
         inside t  49
         spacing attribute  22
      docName attribute
         in rfc element  39
      dt element  22
         inside dl  22

   E
      Elements
         abstract  9, 27
         address  9, 14
         annotation  10, 37
         area  11, 27
         artwork  11, 14, 16, 20, 25, 30, 43, 49
         aside  13, 43
         author  14, 27
         b  10, 15, 17-19, 21, 23-24, 28, 30, 35-37, 49, 53
         back  16, 39



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         blockquote  16
         c  17, 50
         city  18, 34
         code  18, 34
         country  18, 34
         cref  10, 16-18, 21, 23, 28, 30, 35-36, 48-49, 52-53
         date  19, 27
         dd  20, 22
         displayreference  16, 21
         dl  20-21, 30, 49
         dt  22
         em  10, 16-19, 21, 23, 30, 35-37, 48-49, 53
         email  10, 24
         eref  10, 16-17, 19-20, 23-24, 28, 30, 35-36, 48-49, 52-53
         facsimile  9, 24
         figure  14, 16, 20, 25, 30, 43, 49
         format  27, 37
         front  27, 37-38
         i  10, 16-19, 21, 23, 28, 30, 35-37, 48-49, 53
         iref  10, 14, 16-17, 21, 23, 25, 28, 30, 35-36, 43, 48-49,
            52-53
         keyword  27, 29
         li  29, 32, 54
         list  30, 49
         middle  31, 39
         note  28, 31
         ol  20, 30, 32, 49
         organization  14, 33
         phone  9, 33
         postal  9, 34
         postalLine  34
         postamble  25, 35, 50
         preamble  25, 35, 50
         refcontent  36-37
         reference  37-38
         references  16, 38
         region  34, 38
         rfc  38
         section  16, 31, 43
         seriesInfo  37, 45
         sourcecode  14, 17, 20, 25, 30, 43, 45, 49
         spanx  10, 17, 35-36, 47, 49
         street  34, 47
         strong  10, 17, 19, 21, 23, 28, 30, 35-37, 48-49, 53
         t  9, 14, 20, 30-31, 43, 48
         texttable  14, 43, 49
         title  27, 51
         titleelement  25, 43, 50, 52



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         tt  10, 16-17, 19, 21, 23, 28, 30, 35-37, 48-49, 52
         ttcol  50, 53
         ul  20, 30, 49, 54
         uri  10, 54
         vspace  49, 55
         workgroup  27, 55
         xref  10, 16-17, 19-20, 22-23, 28, 30, 35-36, 48-49, 52-53, 55
      em element  23
         inside annotation  10
         inside b  16
         inside blockquote  17
         inside c  18
         inside cref  19
         inside dd  21
         inside dt  23
         inside li  30
         inside postamble  35
         inside preamble  36
         inside refcontent  37
         inside strong  48
         inside t  49
         inside tt  53
      email element  24
         ascii attribute  24
         inside address  10
      empty attribute
         in ul element  54
      eref element  24
         inside annotation  10
         inside b  16
         inside c  17
         inside cref  19
         inside dd  20
         inside dt  23
         inside em  23
         inside i  28
         inside li  30
         inside postamble  35
         inside preamble  36
         inside strong  48
         inside t  49
         inside titleelement  52
         inside tt  53
         inside ttcol  53
         target attribute  24

   F
      facsimile element  24



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         inside address  9
      figure element  25
         align attribute  25
         alt attribute  26
         anchor attribute  26
         autogeneratedFigureNumber attribute  26
         height attribute  26
         inside aside  14
         inside blockquote  16
         inside dd  20
         inside li  30
         inside section  43
         inside t  49
         src attribute  26
         suppress-title attribute  26
         title attribute  26
         width attribute  26
      format attribute
         in xref element  56
      format element  27
         inside reference  37
         octets attribute  27
         target attribute  27
         type attribute  27
      from attribute
         in displayreference element  21
      front element  27
         inside reference  37
         inside rfc  38
      fullname attribute
         in author element  15

   H
      hangIndent attribute
         in list element  31
      hanging attribute
         in dl element  22
      height attribute
         in artwork element  12
         in figure element  26

   I
      i element  28
         inside annotation  10
         inside b  16
         inside blockquote  17
         inside c  18
         inside cref  19



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         inside dd  21
         inside dt  23
         inside li  30
         inside postamble  35
         inside preamble  36
         inside refcontent  37
         inside strong  48
         inside t  49
         inside tt  53
      initials attribute
         in author element  15
      ipr attribute
         '*2026'  66
         '*3667'  66
         '*3978'  66
         '*trust200811'  66
         '*trust200902'  64
         'noDerivativesTrust200902'  65
         'noModificationTrust200902'  65
         'pre5378Trust200902'  65
         'trust200902'  65
         in rfc element  40
      iprExtract attribute
         in rfc element  41
      iref element  28
         inside annotation  10
         inside aside  14
         inside b  16
         inside c  17
         inside dd  21
         inside dt  23
         inside em  23
         inside figure  25
         inside i  28
         inside li  30
         inside postamble  35
         inside preamble  36
         inside section  43
         inside strong  48
         inside t  49
         inside titleelement  52
         inside tt  53
         inside ttcol  53
         item attribute  29
         primary attribute  29
         subitem attribute  29
      item attribute
         in iref element  29



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   K
      keyword element  29
         inside front  27

   L
      li element  29
         inside ol  32
         inside ul  54
      list element  30
         counter attribute  31
         hangIndent attribute  31
         inside t  49
         style attribute  31

   M
      Media Type
         application/rfc+xml  60
      middle element  31
         inside rfc  39
      month attribute
         in date element  20

   N
      name attribute
         in artwork element  12
         in seriesInfo element  45
         in sourcecode element  46
      note element  31
         inside front  28
         title attribute  31
      number attribute
         in rfc element  41
      numbered attribute
         in section element  44

   O
      obsoletes attribute
         in rfc element  41
      octets attribute
         in format element  27
      ol element  32
         inside dd  20
         inside li  30
         inside t  49
         spacing attribute  32
         start attribute  32
         style attribute  32
      organization element  33



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         abbrev attribute  33
         ascii attribute  33
         inside author  14

   P
      pageno attribute
         in xref element  57
      phone element  33
         inside address  9
      postal element  34
         inside address  9
         xml:lang attribute  34
      postalLine element  34
         inside postal  34
      postamble element  35
         inside figure  25
         inside texttable  50
      preamble element  35
         inside figure  25
         inside texttable  50
      primary attribute
         in iref element  29

   R
      refcontent element  36
         inside reference  37
      reference element  37
         anchor attribute  37
         inside references  38
         target attribute  37
      references element  38
         inside back  16
         title attribute  38
      region element  38
         inside postal  34
      relative attribute
         in xref element  57
      removeInRFC attribute
         in section element  44
      rfc element  38
         autogeneratedBoilerplateText attribute  39
         category attribute  39
         consensus attribute  39
         docName attribute  39
         ipr attribute  40
         iprExtract attribute  41
         number attribute  41
         obsoletes attribute  41



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         seriesNo attribute  41
         sortRefs attribute  41
         submissionType attribute  41
         symRefs attribute  42
         tocDepth attribute  42
         tocInclude attribute  42
         updates attribute  42
         xml:lang attribute  42
      role attribute
         in author element  15

   S
      section attribute
         in xref element  57
      section element  43
         anchor attribute  43
         autogeneratedSectionNumber attribute  43
         inside back  16
         inside middle  31
         inside section  43
         numbered attribute  44
         removeInRFC attribute  44
         title attribute  44
         toc attribute  44
      sectionFormat attribute
         in xref element  57
      seriesInfo element  45
         inside reference  37
         name attribute  45
         value attribute  45
      seriesNo attribute
         in rfc element  41
      sortRefs attribute
         in rfc element  41
      source attribute
         in cref element  19
      sourcecode element  45
         inside aside  14
         inside blockquote  17
         inside dd  20
         inside figure  25
         inside li  30
         inside section  43
         inside t  49
         name attribute  46
         type attribute  46
      spacing attribute
         in dl element  22



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         in ol element  32
         in ul element  54
      spanx element  47
         inside annotation  10
         inside c  17
         inside postamble  35
         inside preamble  36
         inside t  49
         style attribute  47
         xml:space attribute  47
      src attribute
         in artwork element  12
         in figure element  26
      start attribute
         in ol element  32
      street element  47
         inside postal  34
      strong element  48
         inside annotation  10
         inside blockquote  17
         inside c  17
         inside cref  19
         inside dd  21
         inside dt  23
         inside em  23
         inside i  28
         inside li  30
         inside postamble  35
         inside preamble  36
         inside refcontent  37
         inside t  49
         inside tt  53
      style attribute
         in list element  31
         in ol element  32
         in spanx element  47
         in texttable element  51
      subitem attribute
         in iref element  29
      submissionType attribute
         in rfc element  41
      suppress-title attribute
         in figure element  26
         in texttable element  51
      surname attribute
         in author element  15
      symRefs attribute
         in rfc element  42



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   T
      t element  48
         anchor attribute  49
         inside abstract  9
         inside aside  14
         inside dd  20
         inside li  30
         inside list  31
         inside note  31
         inside section  43
      target attribute
         in eref element  24
         in format element  27
         in reference element  37
         in xref element  58
      texttable element  49
         align attribute  50
         anchor attribute  50
         autogeneratedTableNumber attribute  50
         inside aside  14
         inside section  43
         style attribute  51
         suppress-title attribute  51
         title attribute  51
      title attribute
         in figure element  26
         in note element  31
         in references element  38
         in section element  44
         in texttable element  51
      title element  51
         abbrev attribute  52
         inside front  27
      titleelement element  52
         inside figure  25
         inside section  43
         inside texttable  50
      to attribute
         in displayreference element  21
      toc attribute
         in section element  44
      tocDepth attribute
         in rfc element  42
      tocInclude attribute
         in rfc element  42
      tt element  52
         inside annotation  10
         inside b  16



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         inside blockquote  17
         inside c  17
         inside cref  19
         inside dd  21
         inside dt  23
         inside em  23
         inside i  28
         inside li  30
         inside postamble  35
         inside preamble  36
         inside refcontent  37
         inside strong  48
         inside t  49
         inside titleelement  52
      ttcol element  53
         align attribute  53
         inside texttable  50
         width attribute  54
      type attribute
         in artwork element  13
         in format element  27
         in sourcecode element  46

   U
      ul element  54
         empty attribute  54
         inside dd  20
         inside li  30
         inside t  49
         spacing attribute  54
      updates attribute
         in rfc element  42
      uri element  54
         inside address  10

   V
      value attribute
         in seriesInfo element  45
      vspace element  55
         blankLines attribute  55
         inside t  49

   W
      width attribute
         in artwork element  13
         in figure element  26
         in ttcol element  54
      workgroup element  55



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Internet-Draft                  XML2RFCv3                     April 2014


         inside front  27

   X
      xml:lang attribute
         in artwork element  13
         in author element  15
         in postal element  34
         in rfc element  42
      xml:space attribute
         in artwork element  13
         in spanx element  47
      xref element  55
         format attribute  56
         inside annotation  10
         inside b  16
         inside c  17
         inside cref  19
         inside dd  20
         inside dt  22
         inside em  23
         inside i  28
         inside li  30
         inside postamble  35
         inside preamble  36
         inside strong  48
         inside t  49
         inside titleelement  52
         inside tt  53
         inside ttcol  53
         pageno attribute  57
         relative attribute  57
         section attribute  57
         sectionFormat attribute  57
         target attribute  58
      xref formats
         counter  56
         default  56
         none  56
         title  57

   Y
      year attribute
         in date element  20








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Internet-Draft                  XML2RFCv3                     April 2014


Author's Address

   Paul Hoffman
   VPN Consortium

   EMail: paul.hoffman@vpnc.org













































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