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Network Working Group                                         P. Hoffman
Internet-Draft                                            VPN Consortium
Obsoletes: 2629 (if approved)                             March 18, 2014
Intended status: Standards Track
Expires: September 19, 2014


                   The 'XML2RFC' version 3 Vocabulary
                        draft-hoffman-xml2rfc-04

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 September 19, 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 . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Differences from v2 to v3  . . . . . . . . . . . . . . . .  4
       1.1.1.  Design for Changes in Reference Handling . . . . . . .  6
     1.2.  Syntax Notation  . . . . . . . . . . . . . . . . . . . . .  7
   2.  Elements . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     2.1.  <abstract> . . . . . . . . . . . . . . . . . . . . . . . .  8
     2.2.  <address>  . . . . . . . . . . . . . . . . . . . . . . . .  8
     2.3.  <annotation> . . . . . . . . . . . . . . . . . . . . . . .  8
     2.4.  <area> . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     2.5.  <artwork>  . . . . . . . . . . . . . . . . . . . . . . . . 10
     2.6.  <author> . . . . . . . . . . . . . . . . . . . . . . . . . 12
     2.7.  <b>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     2.8.  <back> . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     2.9.  <blockquote> . . . . . . . . . . . . . . . . . . . . . . . 15
     2.10. <c>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     2.11. <city> . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     2.12. <code> . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     2.13. <country>  . . . . . . . . . . . . . . . . . . . . . . . . 16
     2.14. <cref> . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     2.15. <date> . . . . . . . . . . . . . . . . . . . . . . . . . . 17
     2.16. <dd> . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     2.17. <dl> . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
     2.18. <dt> . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
     2.19. <email>  . . . . . . . . . . . . . . . . . . . . . . . . . 20
     2.20. <eref> . . . . . . . . . . . . . . . . . . . . . . . . . . 21
     2.21. <facsimile>  . . . . . . . . . . . . . . . . . . . . . . . 21
     2.22. <figure> . . . . . . . . . . . . . . . . . . . . . . . . . 21
     2.23. <format> . . . . . . . . . . . . . . . . . . . . . . . . . 23
     2.24. <front>  . . . . . . . . . . . . . . . . . . . . . . . . . 23
     2.25. <i>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
     2.26. <innerRefContent>  . . . . . . . . . . . . . . . . . . . . 24
     2.27. <iref> . . . . . . . . . . . . . . . . . . . . . . . . . . 25
     2.28. <keyword>  . . . . . . . . . . . . . . . . . . . . . . . . 26
     2.29. <li> . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
     2.30. <list> . . . . . . . . . . . . . . . . . . . . . . . . . . 27
     2.31. <middle> . . . . . . . . . . . . . . . . . . . . . . . . . 27
     2.32. <note> . . . . . . . . . . . . . . . . . . . . . . . . . . 28
     2.33. <ol> . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
     2.34. <organization> . . . . . . . . . . . . . . . . . . . . . . 29



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     2.35. <phone>  . . . . . . . . . . . . . . . . . . . . . . . . . 30
     2.36. <postal> . . . . . . . . . . . . . . . . . . . . . . . . . 30
     2.37. <postalline> . . . . . . . . . . . . . . . . . . . . . . . 31
     2.38. <postamble>  . . . . . . . . . . . . . . . . . . . . . . . 31
     2.39. <preamble> . . . . . . . . . . . . . . . . . . . . . . . . 31
     2.40. <reference>  . . . . . . . . . . . . . . . . . . . . . . . 32
     2.41. <references> . . . . . . . . . . . . . . . . . . . . . . . 34
     2.42. <region> . . . . . . . . . . . . . . . . . . . . . . . . . 35
     2.43. <rfc>  . . . . . . . . . . . . . . . . . . . . . . . . . . 35
     2.44. <section>  . . . . . . . . . . . . . . . . . . . . . . . . 38
     2.45. <seriesInfo> . . . . . . . . . . . . . . . . . . . . . . . 40
     2.46. <spanx>  . . . . . . . . . . . . . . . . . . . . . . . . . 40
     2.47. <street> . . . . . . . . . . . . . . . . . . . . . . . . . 41
     2.48. <t>  . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
     2.49. <texttable>  . . . . . . . . . . . . . . . . . . . . . . . 42
     2.50. <tindent>  . . . . . . . . . . . . . . . . . . . . . . . . 44
     2.51. <title>  . . . . . . . . . . . . . . . . . . . . . . . . . 44
     2.52. <tt> . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
     2.53. <ttcol>  . . . . . . . . . . . . . . . . . . . . . . . . . 45
     2.54. <ul> . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
     2.55. <uri>  . . . . . . . . . . . . . . . . . . . . . . . . . . 47
     2.56. <vspace> . . . . . . . . . . . . . . . . . . . . . . . . . 47
     2.57. <workgroup>  . . . . . . . . . . . . . . . . . . . . . . . 47
     2.58. <xref> . . . . . . . . . . . . . . . . . . . . . . . . . . 48
   3.  Special Unicode Code Points  . . . . . . . . . . . . . . . . . 49
   4.  Internationalization Considerations  . . . . . . . . . . . . . 50
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 50
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 50
     6.1.  Internet Media Type Registration . . . . . . . . . . . . . 50
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 51
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 52
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 52
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 52
   Appendix A.  Front Page Generation . . . . . . . . . . . . . . . . 54
     A.1.  The /rfc/@category Attribute . . . . . . . . . . . . . . . 54
     A.2.  The /rfc/@ipr Attribute  . . . . . . . . . . . . . . . . . 54
       A.2.1.  Current Values: '*trust200902' . . . . . . . . . . . . 54
       A.2.2.  Historic Values  . . . . . . . . . . . . . . . . . . . 56
   Appendix B.  Relax NG Schema . . . . . . . . . . . . . . . . . . . 57
   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64











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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.

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

1.1.  Differences from v2 to v3

   The following is a hopefully-complete list of all the technical
   changes between [XML2RFCv2] and this document.  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.

   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.

   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



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   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 RFC Editor's processor will have a "convert with
   warnings" mode that will convert a v2 document to a v3 document that
   converts deprecated features wherever possible, issuing warnings for
   where it cannot convert.  The processor will also have a "strict"
   mode that will issue errors if any deprecated features are in the
   input.

   The list of changes so far is:

   o  Did not generate the grammar from a DTD, but instead directly from
      the RNG grammar.

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

   o  In <artwork> and <author>, added optional "xml:lang" attribute.

   o  Allowed <artwork> to be in a <section>, not just a figure.

   o  Deprecated "xml:space" in <artwork> because there was only one
      useful value.

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

   o  Added the <b>, <i>, and <tt> elements.

   o  Added the <blockquote> element.

   o  Allowed <b>, <eref>, <i>, <tt>, and <xref> in <cref>.

   o  Deprecated <facsimile> because it is rarely used and is not
      actually useful.

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

   o  Allowed more than one <artwork> in <figure>.

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

   o  Added <innerRefContent> to allow better control of text in a
      reference.





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

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

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

   o  Added <postalline>, free text that represents one line of the
      address.

   o  Changed the handling of <reference>.  This large change is
      described in Section 1.1.1.

   o  Allowed the elements inside a <reference> to be in any order.

   o  In <section>, added the optional "numbered" and "removeinrfc"
      attributes.

   o  Deprecated <spanx> element, and replaced it with <b>, <i>, and
      <tt>.

   o  Added the <tindent> element for indented paragraphs.

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

   o  Deprecated <vspace> because the v2 spec labeled it as "a purely
      presentational element and thus its use ought to be avoided".

   o  Deprecated the "pageno" attribute in <xref> because it was unused
      in v2.

   o  Added the "section" attribute in <xref>.

   o  Added "ascii" attributes to <author>, <email>, and <organization>
      elements.  This allows an athor 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.

1.1.1.  Design for Changes in Reference Handling

   This section describes one of the larger changes in the design of v3,
   namely the additions to make using references easier.  Most
   references in most recent RFCs are just to RFCs; sometimes they are
   Internet Drafts as work-in-progress; much less often they are
   pointers to standards of other SDOs, research articles, or just plain



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   URLs.  There have been many complaints about how difficult it is for
   people who don't have strong XML skills to use references when making
   Internet Drafts.

   The two popular methods now for references to RFCs are entering the
   whole reference by hand (hopefully getting all the fiddly bits of
   <front> and <seriesInfo> correct), or using XML entities that call
   out the xml.resource.org.  Both work, but both have their faults.
   The first requires good copying skills and sometimes causes difficult
   XML errors; the second prevents you from changing the anchor name
   and, less importantly, also requires that you be online when you run
   the xml2rfc processor.

   To make entering references easier for the vast majority of cases,
   the following changes have been made in the v3 vocabulary:

   o  The <reference> element can take another optional pair of
      attributes: "series" and "document".  For example, the value for
      "series" would be "rfc", "fyi", "id", "bcp", and "std" for IETF-
      controlled documents; there would be many series for non-IETF
      documents as well.  The value for "document" depends on the
      series, as described in <reference>.

   o  The processor would emit a properly-formatted output for the
      reference in the non-canonical display formats based on rules
      built into the processor and data for the references.  The library
      used for expansion of the references will be maintained by the RFC
      Editor.

   o  Thus, the contents of <reference> changes from requiring a <front>
      element to making the <front> element optional if a "series" is
      given.

1.2.  Syntax Notation

   The XML vocabulary here is defined in prose, based on the Relax NG
   schema ([RNC]) contained in Appendix B (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.



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   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.  The abstract ought to be
   self-contained and thus should not contain references or unexpanded
   abbreviations.  See [RFCSTYLE] for more information.

   This element appears as child element of: <front> (Section 2.24).

   Content model:

   One or more <t> elements (Section 2.48)

2.2.  <address>

   Provides address information for the author.

   This element appears as child element of: <author> (Section 2.6).

   Content model:

   In any order:

   o  <postal> elements (Section 2.36)

   o  <phone> elements (Section 2.35)

   o  <facsimile> elements (Section 2.21)

   o  <email> elements (Section 2.19)

   o  <uri> elements (Section 2.55)

2.3.  <annotation>

   Provides additional prose augmenting a bibliographical reference.











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   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 2.40).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <spanx> elements (Section 2.46)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.4.  <area>

   Provides information about the IETF area this document applies to
   (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>:
   "Applications", "app", "General", "gen", "Internet", "int",
   "Operations and Management", "ops", "Real-time Applications and
   Infrastructure", "rai", "Routing", "rtg", "Security", "sec",
   "Transport", "tsv".

   This element appears as child element of: <front> (Section 2.24).

   Content model: only text content.



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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  source code,

   o  formal languages (such as ABNF or the RNC notation used in this
      document),

   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.  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.  Note that RFCs occasionally are
   published with enhanced diagrams; a recent example is [RFC5598].

   This element appears as child element of: <blockquote> (Section 2.9),
   <dd> (Section 2.16), <figure> (Section 2.22), <li> (Section 2.29),
   <section> (Section 2.44), <t> (Section 2.48), and <tindent>
   (Section 2.50).

   Content model:

   Text

2.5.1.  'align' attribute

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

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"




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2.5.2.  'alt' attribute

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

2.5.3.  'height' attribute

   The suggested height of the graphics included using the "src"
   attribute.

   This attribute is format-dependent and ought to be avoided.

   When generating HTML output, current implementations copy the
   attribute "as is".  For other output formats it is usually ignored.

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 source code).

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 essentially is in-lined.

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 processor
   might add type-specific formatting to artwork with the preferred
   values in the non-canonical output formats.  If the processor
   encounters a value for "type" that is not one of the preferred
   values, it can issue a warning.

   The beginning list of preferred values are:

   o  abnf

   o  ascii-art

   o  asn.1





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   o  bash

   o  c++

   o  c

   o  call-flow

   o  hex-dump

   o  mib

   o  perl

   o  python

   The RFC Editor will mainatin 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

   The suggested width of the graphics included using the "src"
   attribute.

   This attribute is format-dependent and ought to be avoided.

   When generating HTML output, current implementations copy the
   attribute "as is".  For other output formats it is usually ignored.

2.5.8.  'xml:lang' attribute

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

2.5.9.  'xml:space' attribute

   Deprecated.

2.6.  <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]).




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

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

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

   This element appears as child element of: <front> (Section 2.24).

   Content model:

   In this order:

   1.  One optional <organization> element (Section 2.34)

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

2.6.1.  'ascii' attribute

   The ASCII equivalent of the author's full name.

2.6.2.  'fullname' attribute

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

2.6.3.  'initials' attribute

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

   Initials should be provided as a whitespace separated list of pairs
   of a letter and a dot.

2.6.4.  'role' attribute

   Specifies the role the author had in creating the document.

   Allowed values:

   o  "editor"






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2.6.5.  'surname' attribute

   The author's surname.

2.6.6.  'xml:lang' attribute

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

2.7.  <b>

   Causes the text to be displayed in a bold font.

   This element appears as child element of: <annotation> (Section 2.3),
   <blockquote> (Section 2.9), <c> (Section 2.10), <cref>
   (Section 2.14), <dd> (Section 2.16), <dt> (Section 2.18), <i>
   (Section 2.25), <innerRefContent> (Section 2.26), <li>
   (Section 2.29), <postamble> (Section 2.38), <preamble>
   (Section 2.39), <t> (Section 2.48), <tindent> (Section 2.50), and
   <tt> (Section 2.52).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <tt> elements (Section 2.52)

   o  <i> elements (Section 2.25)

2.8.  <back>

   Contains the "back" part of the document: the references and
   appendices.

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

   Content model:




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   In this order:

   1.  Optional <references> elements (Section 2.41)

   2.  Optional <section> elements (Section 2.44)

2.9.  <blockquote>

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

   Content model:

   In any order:

   o  Text

   o  <figure> elements (Section 2.22)

   o  <artwork> elements (Section 2.5)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.9.1.  'anchor' attribute

   Document-wide unique identifier for this quotation.  The processor
   will auto-generate an identifier when none is given.

2.9.2.  'cite' attribute (mandatory)

   The source of the citation.  This must be a URL.  NEEDS AN EXAMPLE OF
   A CITE FOR A REFERENCE THAT IS ALREADY IN THE SPEC.

2.10.  <c>

   Provides the content of a cell in a table.

   This element appears as child element of: <texttable> (Section 2.49).

   Content model:

   In any order:





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   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <spanx> elements (Section 2.46)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.11.  <city>

   Gives the city name in a postal address.

   This element appears as child element of: <postal> (Section 2.36).

   Content model: only text content.

2.12.  <code>

   Gives the postal region code.

   This element appears as child element of: <postal> (Section 2.36).

   Content model: only text content.

2.13.  <country>

   Gives the country in a postal address.

   This element appears as child element of: <postal> (Section 2.36).

   Content model: only text content.

2.14.  <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



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   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 2.7), <c> (Section 2.10), <dd> (Section 2.16), <dt>
   (Section 2.18), <i> (Section 2.25), <li> (Section 2.29), <postamble>
   (Section 2.38), <preamble> (Section 2.39), <t> (Section 2.48),
   <tindent> (Section 2.50), <tt> (Section 2.52), and <ttcol>
   (Section 2.53).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

   o  <tt> elements (Section 2.52)

2.14.1.  'anchor' attribute

   Document-wide unique identifier for this comment.  The processor will
   auto-generate an identifier when none is given.

2.14.2.  'source' attribute

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

2.15.  <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.

   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.



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   Note that month names need to match the full (English) month name
   ("January", "February", "March", "April", "May, "June", "July",
   "August", "September", "October", "November", or "December") in order
   for expiration calculations to work (some implementations might
   support additional formats, though).

   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.

   This element appears as child element of: <front> (Section 2.24).

   Content model: this element does not have any contents.

2.15.1.  'day' attribute

   Day of publication.

2.15.2.  'month' attribute

   Month of publication.

2.15.3.  'year' attribute

   Year of publication.

2.16.  <dd>

   The definition part of a entry in a definition list.

   This element appears as child element of: <dl> (Section 2.17).

   Content model:

   In any order:

   o  Text

   o  <ol> elements (Section 2.33)

   o  <ul> elements (Section 2.54)

   o  <figure> elements (Section 2.22)

   o  <artwork> elements (Section 2.5)

   o  <xref> elements (Section 2.58)




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   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.17.  <dl>

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

   This element appears as child element of: <li> (Section 2.29), and
   <t> (Section 2.48).

   Content model:

   One or more <dt> elements (Section 2.18)

   One or more <dd> elements (Section 2.16)

2.17.1.  '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"

2.17.2.  '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:





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   o  "normal" (default)

   o  "compact"

2.18.  <dt>

   The definition part of a entry in a definition list.

   This element appears as child element of: <dl> (Section 2.17).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.19.  <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.

2.19.1.  'ascii' attribute

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




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2.20.  <eref>

   Represents an "external" link (as specified in the "target"
   attribute).

   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 2.7), <c> (Section 2.10), <cref> (Section 2.14), <dd>
   (Section 2.16), <dt> (Section 2.18), <i> (Section 2.25), <li>
   (Section 2.29), <postamble> (Section 2.38), <preamble>
   (Section 2.39), <t> (Section 2.48), <tindent> (Section 2.50), <tt>
   (Section 2.52), and <ttcol> (Section 2.53).

   Content model: only text content.

2.20.1.  'target' attribute (mandatory)

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

2.21.  <facsimile>

   Deprecated.

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

   Content model: only text content.

2.22.  <figure>

   A container for artwork that can have an optional title, preamble
   text, and postamable text.

   This element appears as child element of: <blockquote> (Section 2.9),
   <dd> (Section 2.16), <li> (Section 2.29), <section> (Section 2.44),
   <t> (Section 2.48), and <tindent> (Section 2.50).

   Content model:

   In this order:

   1.  Optional <iref> elements (Section 2.27)

   2.  One optional <preamble> element (Section 2.39)





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   3.  One or more <artwork> elements (Section 2.5)

   4.  One optional <postamble> element (Section 2.38)

2.22.1.  '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"

2.22.2.  'alt' attribute

   Deprecated.

2.22.3.  'anchor' attribute

   Document-wide unique identifier for this figure.

2.22.4.  'height' attribute

   Deprecated.

2.22.5.  'src' attribute

   Deprecated.

2.22.6.  'suppress-title' attribute

   Figures that have an "anchor" attribute will automatically get an
   autogenerated title (such as "Figure 1").  Setting this attribute to
   "false" will prevent this.

   Allowed values:

   o  "true"

   o  "false" (default)






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2.22.7.  'title' attribute

   The title for the figure; this appears on a line after the artwork.
   If the figure has an "anchor" attribute, the title gets an
   autogenerated label such as "Figure 1", unless the "suppress-title"
   attribute is set to "true".

2.22.8.  'width' attribute

   Deprecated.

2.23.  <format>

   Depredated.  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 2.40).

   Content model: this element does not have any contents.

2.23.1.  'octets' attribute

   Deprecated.

2.23.2.  'target' attribute

   Deprecated.

2.23.3.  'type' attribute (mandatory)

   Deprecated.

2.24.  <front>

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

   This element appears as child element of: <reference> (Section 2.40),
   and <rfc> (Section 2.43).

   Content model:

   In this order:

   1.  One <title> element (Section 2.51)

   2.  One or more <author> elements (Section 2.6)




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   3.  One optional <date> element (Section 2.15)

   4.  Optional <area> elements (Section 2.4)

   5.  Optional <workgroup> elements (Section 2.57)

   6.  Optional <keyword> elements (Section 2.28)

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

   8.  Optional <note> elements (Section 2.32)

2.25.  <i>

   Causes the text to be displayed in an italic font.

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.7), <blockquote> (Section 2.9), <c> (Section 2.10),
   <cref> (Section 2.14), <dd> (Section 2.16), <dt> (Section 2.18),
   <innerRefContent> (Section 2.26), <li> (Section 2.29), <postamble>
   (Section 2.38), <preamble> (Section 2.39), <t> (Section 2.48),
   <tindent> (Section 2.50), and <tt> (Section 2.52).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <b> elements (Section 2.7)

   o  <tt> elements (Section 2.52)

2.26.  <innerRefContent>

   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.

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



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   Content model:

   In any order:

   o  Text

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.27.  <iref>

   Provides terms for the document's index.

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

   For instance:

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

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

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.7), <c> (Section 2.10), <dd> (Section 2.16), <dt>
   (Section 2.18), <figure> (Section 2.22), <i> (Section 2.25), <li>
   (Section 2.29), <postamble> (Section 2.38), <preamble>
   (Section 2.39), <section> (Section 2.44), <t> (Section 2.48),
   <tindent> (Section 2.50), <tt> (Section 2.52), and <ttcol>
   (Section 2.53).

   Content model: this element does not have any contents.

2.27.1.  'item' attribute (mandatory)

   The item to include.

2.27.2.  'primary' attribute

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

   Allowed values:





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   o  "true"

   o  "false" (default)

2.27.3.  'subitem' attribute

   The subitem to include.

2.28.  <keyword>

   Specifies a keyword applicable to the document.

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

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

   This element appears as child element of: <front> (Section 2.24).

   Content model: only text content.

2.29.  <li>

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

   This element appears as child element of: <ol> (Section 2.33), and
   <ul> (Section 2.54).

   Content model:

   Either:

   o  One or more <t> elements (Section 2.48)

   Or:

   o  Text

      One or more <ol> elements (Section 2.33)

      One or more <ul> elements (Section 2.54)

      One or more <dl> elements (Section 2.17)

      One or more <figure> elements (Section 2.22)

      One or more <artwork> elements (Section 2.5)



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      One or more <xref> elements (Section 2.58)

      One or more <eref> elements (Section 2.20)

      One or more <iref> elements (Section 2.27)

      One or more <cref> elements (Section 2.14)

      One or more <tt> elements (Section 2.52)

      One or more <b> elements (Section 2.7)

      One or more <i> elements (Section 2.25)

2.30.  <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"

   This element appears as child element of: <t> (Section 2.48).

   Content model:

   One or more <t> elements (Section 2.48)

2.30.1.  'counter' attribute

   Deprecated.

2.30.2.  'hangIndent' attribute

   Deprecated.

2.30.3.  'style' attribute

   Deprecated.

2.31.  <middle>

   Represents the main content of the document.

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

   Content model:

   One or more <section> elements (Section 2.44)




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2.32.  <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 2.24).

   Content model:

   One or more <t> elements (Section 2.48)

2.32.1.  'title' attribute (mandatory)

   The title of the note.

2.33.  <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 2.16), <li>
   (Section 2.29), and <t> (Section 2.48).

   Content model:

   One or more <li> elements (Section 2.29)

2.33.1.  '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"

2.33.2.  'start' attribute

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






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2.33.3.  '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, ...)

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

   The following formats are supported:

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

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

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

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

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

   %% Represents a percent sign

   Other formats are reserved for future use.

2.34.  <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 2.6).



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   Content model: only text content.

2.34.1.  'abbrev' attribute

   Abbreviated variant.

2.34.2.  'ascii' attribute

   The ASCII equivalent of the organization's name.

2.35.  <phone>

   Represents a phone number.

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

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

   Content model: only text content.

2.36.  <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 2.47)

      *  <city> elements (Section 2.11)

      *  <region> elements (Section 2.42)

      *  <code> elements (Section 2.12)

      *  <country> elements (Section 2.13)




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   Or:

   o  One or more <postalline> elements (Section 2.37)

2.37.  <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 2.36).

   Content model: only text content.

2.38.  <postamble>

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

   This element appears as child element of: <figure> (Section 2.22),
   and <texttable> (Section 2.49).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <spanx> elements (Section 2.46)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.39.  <preamble>

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

   This element appears as child element of: <figure> (Section 2.22),
   and <texttable> (Section 2.49).



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   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <spanx> elements (Section 2.46)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.40.  <reference>

   Represents a bibliographical reference.

   The reference can be expressed in one of two ways:

      As a <front> element plus optional <seriesInfo>, <format>, and
      <annotation> elements.

      As a pair of attributes: "series" and "document".

   In the latter method, the document does not need to contain any
   specifics for the reference other than a simple specification of the
   reference.

   For example, a refernence to RFC 6068 is given as either:

   <reference anchor="RFC6068">
     <front>
       <title>The 'mailto' URI Scheme</title>
       <author initials="M." surname="Duerst" fullname="M. Duerst"/>
       <author initials="L." surname="Masinter" fullname="L. Masinter"/>
       <author initials="J." surname="Zawinski" fullname="J. Zawinski"/>
       <date year="2010" month="October"/>
     </front>
     <seriesInfo name="RFC" value="6068"/>



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   </reference>

   or

   <reference anchor="RFC6068" series="rfc" document="6068">

   The values for the "series" attribute are:

   +----------+------------------------+-------------------------------+
   | Value    | Value for "document    | Example                       |
   | for      |                        |                               |
   | "series" |                        |                               |
   +----------+------------------------+-------------------------------+
   | rfc      | number                 | "6068"                        |
   | fyi      | number                 | "7"                           |
   | id       | file name              | "draft-hoffman-xml2rfc"       |
   | bcp      | comma-separated list   | "79,3979,4879"                |
   |          | of numbers; the first  |                               |
   |          | number is the BCP      |                               |
   |          | number and the others  |                               |
   |          | are the RFCs that make |                               |
   |          | up the BCP             |                               |
   | std      | comma-separated list   | "69,5730,5731,5732,5733,5734" |
   |          | of numbers; the first  |                               |
   |          | number is the STD      |                               |
   |          | number and the others  |                               |
   |          | are the RFCs that make |                               |
   |          | up the STD             |                               |
   | 3gpp     | TBD                    | "TBD"                         |
   | ansi     | document name and year | "T1-102.1987"                 |
   | ccitt    | document name and year | "X690.2002"                   |
   | fips     | document name and year | "500-166.1989"                |
   | ieee     | document name and year | "802-11H.2003"                |
   | iso      | document name and year | "8859-6.1988"                 |
   | itu      | document name and year | "X509.2000"                   |
   | nist     | document name and year | "500-214.1993"                |
   | pkcs     | document name and year | "9.1993"                      |
   | w3c      | document name (and     | "TBD"                         |
   |          | year?)                 |                               |
   | xsf      | document name (and     | "XEP-0334"                    |
   |          | year?)                 |                               |
   +----------+------------------------+-------------------------------+

   The processor needs to make sure that exactly zero or one of "series"
   is given.  It has to do a sanity check on the "document" value to be
   sure that the value is valid for the "series".  If the "series" value
   is "bcp" or "std", the processor needs to check if the list in the
   "document" list matches the present or a previous set of values for



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   the BCP or STD.

   This element appears as child element of: <references>
   (Section 2.41).

   Content model: this element does not have any contents.

2.40.1.  'anchor' attribute (mandatory)

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

2.40.2.  'document' attribute (mandatory)

   The document or documents that make up a reference, as described
   earlier in this section.

2.40.3.  'series' attribute (mandatory)

   The series from which the referred-to document comes from, as
   described earlier in this section.

2.40.4.  'target' attribute

   Holds the URI for the reference.

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

2.41.  <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 2.8).

   Content model:

   One or more <reference> elements (Section 2.40)





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2.41.1.  'title' attribute

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

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

2.42.  <region>

   Provides the region name in a postal address.

   This element appears as child element of: <postal> (Section 2.36).

   Content model: only text content.

2.43.  <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 2.24)

   2.  One <middle> element (Section 2.31)

   3.  One optional <back> element (Section 2.8)

2.43.1.  'category' attribute

   Document category (see Appendix A.1).

   Allowed values:

   o  "std"

   o  "bcp"

   o  "info"




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   o  "exp"

   o  "historic"

2.43.2.  'consensus' attribute

   Affects the generated boilerplate.

   See [RFC5741] for more information.

   Allowed values:

   o  "no"

   o  "yes"

2.43.3.  '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
   copies from submitted drafts (for instance, by replacing the draft
   number with the string "latest").

   See [IDGUIDE] for further information.

2.43.4.  '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"





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   o  "noDerivatives3667"

   o  "full3978"

   o  "noModification3978"

   o  "noDerivatives3978"

   o  "trust200811"

   o  "noModificationTrust200811"

   o  "noDerivativesTrust200811"

   o  "trust200902"

   o  "noModificationTrust200902"

   o  "noDerivativesTrust200902"

   o  "pre5378Trust200902"

2.43.5.  '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).

2.43.6.  'number' attribute

   The number of the RFC to be produced.

2.43.7.  'obsoletes' attribute

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

2.43.8.  'seriesNo' attribute

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

2.43.9.  'submissionType' attribute

   The document stream.

   See Section 2 of [RFC5741] for details.

   Allowed values:



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   o  "IETF" (default)

   o  "IAB"

   o  "IRTF"

   o  "independent"

2.43.10.  'updates' attribute

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

2.43.11.  'xml:lang' attribute

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

   See Section 2.12 of [XML] for more information.

2.44.  <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.

   This element appears as child element of: <back> (Section 2.8),
   <middle> (Section 2.31), and <section> (Section 2.44).

   Content model:

   In this order:

   1.  In any order:

       *  <t> elements (Section 2.48)

       *  <tindent> elements (Section 2.50)

       *  <figure> elements (Section 2.22)

       *  <texttable> elements (Section 2.49)

       *  <iref> elements (Section 2.27)

       *  <artwork> elements (Section 2.5)





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   2.  Optional <section> elements (Section 2.44)

2.44.1.  'anchor' attribute

   Document-wide unique identifier for this section.

2.44.2.  'numbered' attribute

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

   Allowed values:

   o  "yes" (default)

   o  "no"

2.44.3.  'removeinrfc' attribute

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

   Allowed values:

   o  "yes"

   o  "no" (default)

2.44.4.  'title' attribute (mandatory)

   The title of the section.

2.44.5.  'toc' attribute

   Determines whether the section is included in the Table Of Contents.

   [[anchor2: Need to consider inheritance.]]

   Allowed values:

   o  "include"

   o  "exclude"





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   o  "default" (default)

2.45.  <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 2.40).

   Content model: this element does not have any contents.

2.45.1.  '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".

2.45.2.  '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).

2.46.  <spanx>

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

   This element appears as child element of: <annotation> (Section 2.3),
   <c> (Section 2.10), <postamble> (Section 2.38), <preamble>
   (Section 2.39), and <t> (Section 2.48).

   Content model: only text content.

2.46.1.  'style' attribute

   Deprecated.

2.46.2.  'xml:space' attribute

   Deprecated.

   Allowed values:





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   o  "default"

   o  "preserve" (default)

2.47.  <street>

   Provides a street address.

   This element appears as child element of: <postal> (Section 2.36).

   Content model: only text content.

2.48.  <t>

   Contains a paragraph of text.

   This element appears as child element of: <abstract> (Section 2.1),
   <li> (Section 2.29), <list> (Section 2.30), <note> (Section 2.32),
   and <section> (Section 2.44).

   Content model:

   In any order:

   o  Text

   o  <list> elements (Section 2.30)

   o  <ol> elements (Section 2.33)

   o  <ul> elements (Section 2.54)

   o  <dl> elements (Section 2.17)

   o  <figure> elements (Section 2.22)

   o  <artwork> elements (Section 2.5)

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <spanx> elements (Section 2.46)




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   o  <vspace> elements (Section 2.56)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.48.1.  'anchor' attribute

   Document-wide unique identifier for this paragraph.

2.49.  <texttable>

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

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

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

   Content model:

   In this order:

   1.  One optional <preamble> element (Section 2.39)

   2.  One or more <ttcol> elements (Section 2.53)

   3.  Optional <c> elements (Section 2.10)

   4.  One optional <postamble> element (Section 2.38)

2.49.1.  'align' attribute

   Determines the horizontal alignment of the table.

   Allowed values:

   o  "left"

   o  "center" (default)





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   o  "right"

2.49.2.  'anchor' attribute

   Document-wide unique identifier for this table.

2.49.3.  '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)

2.49.4.  'suppress-title' attribute

   Tables that have an "anchor" attribute will automatically get an
   autogenerated title (such as "Table 1").  Setting this attribute to
   "false" will prevent this.

   Allowed values:

   o  "true"

   o  "false" (default)

2.49.5.  'title' attribute

   The title for the table; this appears on a line after the table's
   body.  If the table has an "anchor" attribute, the title gets an
   autogenerated label such as "Table 1", unless the "suppress-title"
   attribute is set to "true".



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2.50.  <tindent>

   Contains a paragraph of text.  The paragraph is displayed with the
   left and right paragraph margins indented from the page margins.

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

   Content model:

   In any order:

   o  Text

   o  <figure> elements (Section 2.22)

   o  <artwork> elements (Section 2.5)

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <tt> elements (Section 2.52)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.50.1.  'anchor' attribute

   Document-wide unique identifier for this indented paragraph.

2.51.  <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
   specified an abbreviated variant.

   This element appears as child element of: <front> (Section 2.24).

   Content model: only text content.




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2.51.1.  'abbrev' attribute

   Specifies an abbreviated variant of the document title.

2.52.  <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 2.7), <blockquote> (Section 2.9), <c> (Section 2.10),
   <cref> (Section 2.14), <dd> (Section 2.16), <dt> (Section 2.18), <i>
   (Section 2.25), <innerRefContent> (Section 2.26), <li>
   (Section 2.29), <postamble> (Section 2.38), <preamble>
   (Section 2.39), <t> (Section 2.48), and <tindent> (Section 2.50).

   Content model:

   In any order:

   o  Text

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)

   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  <b> elements (Section 2.7)

   o  <i> elements (Section 2.25)

2.53.  <ttcol>

   Contains a column heading in a table.

   This element appears as child element of: <texttable> (Section 2.49).

   Content model:

   In any order:

   o  <xref> elements (Section 2.58)

   o  <eref> elements (Section 2.20)





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   o  <iref> elements (Section 2.27)

   o  <cref> elements (Section 2.14)

   o  Text

2.53.1.  'align' attribute

   Determines the horizontal alignment within the table column.

   Allowed values:

   o  "left" (default)

   o  "center"

   o  "right"

2.53.2.  'width' attribute

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

2.54.  <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 2.16), <li>
   (Section 2.29), and <t> (Section 2.48).

   Content model:

   One or more <li> elements (Section 2.29)

2.54.1.  '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"







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2.54.2.  '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"

2.55.  <uri>

   Contains a web address associated with the author.

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

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

   Content model: only text content.

2.56.  <vspace>

   Deprecated.

   This element appears as child element of: <t> (Section 2.48).

   Content model: this element does not have any contents.

2.56.1.  'blankLines' attribute

   Deprecated.

2.57.  <workgroup>

   This element is used to specify the Working Group the document
   originates from, 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 2.43.9).

   This element appears as child element of: <front> (Section 2.24).




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   Content model: only text content.

2.58.  <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.

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

   This element appears as child element of: <annotation> (Section 2.3),
   <b> (Section 2.7), <c> (Section 2.10), <cref> (Section 2.14), <dd>
   (Section 2.16), <dt> (Section 2.18), <i> (Section 2.25), <li>
   (Section 2.29), <postamble> (Section 2.38), <preamble>
   (Section 2.39), <t> (Section 2.48), <tindent> (Section 2.50), <tt>
   (Section 2.52), and <ttcol> (Section 2.53).

   Content model: only text content.

2.58.1.  'format' attribute

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

   "counter"

      Inserts a counter, such as the number of a section, figure, or
      table.

   "default"

      Inserts a text fragment that describes the referenced part
      completely, such as "Section 2", "Table 4", or "[XML]".

   "none"

      There will be no auto-generated text.

   "title"





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

   Allowed values:

   o  "counter"

   o  "title"

   o  "none"

   o  "default" (default)

2.58.2.  'pageno' attribute

   Deprecated.

   Allowed values:

   o  "true"

   o  "false" (default)

2.58.3.  '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.

2.58.4.  '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

   [[anchor3: Explain those code points where the processors implement
   something special, such as "nbsp".]]






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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-ACSII 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.

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

6.  IANA Considerations

6.1.  Internet Media Type Registration

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

   This document serves as the specification for the Internet media type
   "application/rfc+xml".  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].




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   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].

      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






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8.1.  Normative References

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

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

   [XML2RFCv2]  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",
                <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.



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   [RFC5598]    Crocker, D., "Internet Mail Architecture", RFC 5598,
                July 2009.

                PDF version: <http://www.rfc-editor.org/rfc/rfc5598.pdf>

   [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.

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

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

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

   [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.

   [XPOINTER]   Grosso, P., Maler, E., Marsh, J., and N. Walsh,
                "XPointer Framework", W3C Recommendation REC-xptr-
                framework-20030325, March 2003,



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                <http://www.w3.org/TR/2003/
                REC-xptr-framework-20030325/>.

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

Appendix A.  Front Page Generation

A.1.  The /rfc/@category Attribute

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



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   document were published on September 12, 2009 ([TLP3.0]) and on
   December 28, 2009 ([TLP4.0]), modifying the license for code
   components (see <http://trustee.ietf.org/license-info/> for further
   information).  The actual text is located in Section 6 ("Text To Be
   Included in IETF Documents") of these documents.

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

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

A.2.1.1.  trust200902

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

A.2.1.2.  noModificationTrust200902

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

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

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

A.2.1.3.  noDerivativesTrust200902

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

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

      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":




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

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

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

A.2.2.  Historic Values

A.2.2.1.  Historic Values: '*trust200811'

   The attribute values "trust200811", "noModificationTrust200811" and
   "noDerivativesTrust200811" are similar to their "trust200902"
   counterparts, except that they use text specified in <http://
   trustee.ietf.org/license-info/archive/
   IETF-Trust-License-Policy_11-10-08.pdf>.

A.2.2.2.  Historic Values: '*3978'

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

A.2.2.3.  Historic Values: '*3667'

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

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).




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

Appendix B.  Relax NG 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 }?,
       front,
       middle,
       back?
     }
   front =
     element front {



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       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)* | 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 }?,



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       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 },
       [ a:defaultValue = "yes" ] attribute numbered { "yes" | "no" }?,
       [ a:defaultValue = "default" ]
       attribute toc { "include" | "exclude" | "default" }?,
       [ a:defaultValue = "no" ] attribute removeinrfc { "yes" | "no"
   }?,
       (t | tindent | figure | texttable | iref | artwork)*,
       section*
     }
   t =
     element t {
       attribute anchor { xsd:ID }?,
       (text
        | \list
        | ol
        | ul
        | dl
        | figure
        | artwork
        | xref
        | eref
        | iref
        | cref
        | spanx
        | vspace
        | tt
        | b
        | i)*
     }
   tindent =
     element tindent {



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       attribute anchor { xsd:ID }?,
       (text | figure | artwork | xref | eref | iref | cref | tt | b |
   i)*
     }
   blockquote =
     element blockquote {
       attribute anchor { xsd:ID }?,
       attribute cite { text },
       (text | figure | artwork | tt | b | 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,
          xref,
          eref,
          iref,
          cref,
          tt,
          b,



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          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 | b | i)* }
   dd =
     element dd {
       (text
        | ol
        | ul
        | figure
        | artwork
        | xref
        | eref
        | iref
        | cref
        | tt
        | b
        | 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 }?,
       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



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     }
   cref =
     element cref {
       attribute anchor { xsd:ID }?,
       attribute source { text }?,
       (text | xref | eref | b | i | tt)*
     }
   tt = element tt { (text | xref | eref | iref | cref | b | i)* }
   b = element b { (text | xref | eref | iref | cref | tt | i)* }
   i = element i { (text | xref | eref | iref | cref | b | tt)* }
   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 }?,
       iref*,
       preamble?,
       artwork+,
       postamble?
     }
   preamble =
     element preamble {
       (text | xref | eref | iref | cref | spanx | tt | b | i)*
     }
   artwork =
     element artwork {
       attribute xml:space { text }?,
       [ a:defaultValue = "" ] attribute name { text }?,
       [ a:defaultValue = "" ] attribute type { text }?,



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       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*
     }
   postamble =
     element postamble {
       (text | xref | eref | iref | cref | spanx | tt | b | 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" }?,
       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 | b |
   i)* }
   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 }?,



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       ((attribute series { text },
         attribute document { text })
        | (front, (seriesInfo | format | innerRefContent |
   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 | b | i)*
     }
   innerRefContent = element innerRefContent { (text | tt | b | i)* }
   start = rfc


Index

   A
      abbrev attribute
         in organization element  30
         in title element  45
      abstract element  8
         inside front  24
      address element  8
         inside author  13
      align attribute
         in artwork element  10
         in figure element  22
         in texttable element  42
         in ttcol element  46
      alt attribute
         in artwork element  11
         in figure element  22
      anchor attribute
         in blockquote element  15
         in cref element  17
         in figure element  22



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         in reference element  34
         in section element  39
         in t element  42
         in texttable element  43
         in tindent element  44
      annotation element  8
      application/rfc+xml Media Type  50
      area element  9
         inside front  24
      artwork element  10
         align attribute  10
         alt attribute  11
         height attribute  11
         inside blockquote  15
         inside dd  18
         inside figure  22
         inside li  26
         inside section  38
         inside t  41
         inside tindent  44
         name attribute  11
         src attribute  11
         type attribute  11
         width attribute  12
         xml:lang attribute  12
         xml:space attribute  12
      ascii attribute
         in author element  13
         in email element  20
         in organization element  30
      Attributes
         abbrev  30, 45
         align  10, 22, 42, 46
         alt  11, 22
         anchor  15, 17, 22, 34, 39, 42-44
         ascii  13, 20, 30
         blankLines  47
         category  35
         cite  15
         consensus  36
         counter  27
         day  18
         docName  36
         document  34
         empty  46
         format  48
         fullname  13
         hangIndent  27



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         hanging  19
         height  11, 22
         initials  13
         ipr  36
         iprExtract  37
         item  25
         month  18
         name  11, 40
         number  37
         numbered  39
         obsoletes  37
         octets  23
         pageno  49
         primary  25
         removeinrfc  39
         role  13
         section  49
         series  34
         seriesNo  37
         source  17
         spacing  19, 28, 47
         src  11, 22
         start  28
         style  27, 29, 40, 43
         subitem  26
         submissionType  37
         suppress-title  22, 43
         surname  14
         target  21, 23, 34, 49
         title  23, 28, 35, 39, 43
         toc  39
         type  11, 23
         updates  38
         value  40
         width  12, 23, 46
         xml:lang  12, 14, 38
         xml:space  12, 40
         year  18
      author element  12
         ascii attribute  13
         fullname attribute  13
         initials attribute  13
         inside front  23
         role attribute  13
         surname attribute  14
         xml:lang attribute  14

   B



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      b element  14
         inside annotation  9
         inside blockquote  15
         inside c  16
         inside cref  17
         inside dd  19
         inside dt  20
         inside i  24
         inside innerRefContent  25
         inside li  27
         inside postamble  31
         inside preamble  32
         inside t  42
         inside tindent  44
         inside tt  45
      back element  14
         inside rfc  35
      blankLines attribute
         in vspace element  47
      blockquote element  15
         anchor attribute  15
         cite attribute  15

   C
      c element  15
         inside texttable  42
      category attribute
         in rfc element  35
      cite attribute
         in blockquote element  15
      city element  16
         inside postal  30
      code element  16
         inside postal  30
      consensus attribute
         in rfc element  36
      counter attribute
         in list element  27
      country element  16
         inside postal  30
      cref element  16
         anchor attribute  17
         inside annotation  9
         inside b  14
         inside c  16
         inside dd  19
         inside dt  20
         inside i  24



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         inside li  27
         inside postamble  31
         inside preamble  32
         inside t  41
         inside tindent  44
         inside tt  45
         inside ttcol  46
         source attribute  17

   D
      date element  17
         day attribute  18
         inside front  24
         month attribute  18
         year attribute  18
      day attribute
         in date element  18
      dd element  18
         inside dl  19
      dl element  19
         hanging attribute  19
         inside li  26
         inside t  41
         spacing attribute  19
      docName attribute
         in rfc element  36
      document attribute
         in reference element  34
      dt element  20
         inside dl  19

   E
      Elements
         abstract  8, 24
         address  8, 13
         annotation  8
         area  9, 24
         artwork  10, 15, 18, 22, 26, 38, 41, 44
         author  12, 23
         b  9, 14-17, 19-20, 24-25, 27, 31-32, 42, 44-45
         back  14, 35
         blockquote  15
         c  15, 42
         city  16, 30
         code  16, 30
         country  16, 30
         cref  9, 14, 16, 19-20, 24, 27, 31-32, 41, 44-46
         date  17, 24



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         dd  18-19
         dl  19, 26, 41
         dt  19-20
         email  8, 20
         eref  9, 14, 16-17, 19-21, 24, 27, 31-32, 41, 44-45
         facsimile  8, 21
         figure  15, 18, 21, 26, 38, 41, 44
         format  23
         front  23, 35
         i  9, 14-17, 19-20, 24-25, 27, 31-32, 42, 44-45
         innerRefContent  24
         iref  9, 14, 16, 19-21, 24-25, 27, 31-32, 38, 41, 44-46
         keyword  24, 26
         li  26, 28, 46
         list  27, 41
         middle  27, 35
         note  24, 28
         ol  18, 26, 28, 41
         organization  13, 29
         phone  8, 30
         postal  8, 30
         postalline  31
         postamble  22, 31, 42
         preamble  21, 31, 42
         reference  32, 34
         references  15, 34
         region  30, 35
         rfc  35
         section  15, 27, 38-39
         seriesInfo  40
         spanx  9, 16, 31-32, 40-41
         street  30, 41
         t  8, 26-28, 38, 41
         texttable  38, 42
         tindent  38, 44
         title  23, 44
         tt  9, 14-17, 19-20, 24-25, 27, 31-32, 42, 44-45
         ttcol  42, 45
         ul  18, 26, 41, 46
         uri  8, 47
         vspace  42, 47
         workgroup  24, 47
         xref  9, 14, 16-18, 20, 24, 27, 31-32, 41, 44-45, 48
      email element  20
         ascii attribute  20
         inside address  8
      empty attribute
         in ul element  46



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      eref element  21
         inside annotation  9
         inside b  14
         inside c  16
         inside cref  17
         inside dd  19
         inside dt  20
         inside i  24
         inside li  27
         inside postamble  31
         inside preamble  32
         inside t  41
         inside tindent  44
         inside tt  45
         inside ttcol  45
         target attribute  21

   F
      facsimile element  21
         inside address  8
      figure element  21
         align attribute  22
         alt attribute  22
         anchor attribute  22
         height attribute  22
         inside blockquote  15
         inside dd  18
         inside li  26
         inside section  38
         inside t  41
         inside tindent  44
         src attribute  22
         suppress-title attribute  22
         title attribute  23
         width attribute  23
      format attribute
         in xref element  48
      format element  23
         octets attribute  23
         target attribute  23
         type attribute  23
      front element  23
         inside rfc  35
      fullname attribute
         in author element  13

   H
      hangIndent attribute



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         in list element  27
      hanging attribute
         in dl element  19
      height attribute
         in artwork element  11
         in figure element  22

   I
      i element  24
         inside annotation  9
         inside b  14
         inside blockquote  15
         inside c  16
         inside cref  17
         inside dd  19
         inside dt  20
         inside innerRefContent  25
         inside li  27
         inside postamble  31
         inside preamble  32
         inside t  42
         inside tindent  44
         inside tt  45
      initials attribute
         in author element  13
      innerRefContent element  24
      ipr attribute
         '*2026'  56
         '*3667'  56
         '*3978'  56
         '*trust200811'  56
         '*trust200902'  54
         'noDerivativesTrust200902'  55
         'noModificationTrust200902'  55
         'pre5378Trust200902'  55
         'trust200902'  55
         in rfc element  36
      iprExtract attribute
         in rfc element  37
      iref element  25
         inside annotation  9
         inside b  14
         inside c  16
         inside dd  19
         inside dt  20
         inside figure  21
         inside i  24
         inside li  27



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         inside postamble  31
         inside preamble  32
         inside section  38
         inside t  41
         inside tindent  44
         inside tt  45
         inside ttcol  46
         item attribute  25
         primary attribute  25
         subitem attribute  26
      item attribute
         in iref element  25

   K
      keyword element  26
         inside front  24

   L
      li element  26
         inside ol  28
         inside ul  46
      list element  27
         counter attribute  27
         hangIndent attribute  27
         inside t  41
         style attribute  27

   M
      Media Type
         application/rfc+xml  50
      middle element  27
         inside rfc  35
      month attribute
         in date element  18

   N
      name attribute
         in artwork element  11
         in seriesInfo element  40
      note element  28
         inside front  24
         title attribute  28
      number attribute
         in rfc element  37
      numbered attribute
         in section element  39

   O



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      obsoletes attribute
         in rfc element  37
      octets attribute
         in format element  23
      ol element  28
         inside dd  18
         inside li  26
         inside t  41
         spacing attribute  28
         start attribute  28
         style attribute  29
      organization element  29
         abbrev attribute  30
         ascii attribute  30
         inside author  13

   P
      pageno attribute
         in xref element  49
      phone element  30
         inside address  8
      postal element  30
         inside address  8
      postalline element  31
         inside postal  31
      postamble element  31
         inside figure  22
         inside texttable  42
      preamble element  31
         inside figure  21
         inside texttable  42
      primary attribute
         in iref element  25

   R
      reference element  32
         anchor attribute  34
         document attribute  34
         inside references  34
         series attribute  34
         target attribute  34
      references element  34
         inside back  15
         title attribute  35
      region element  35
         inside postal  30
      removeinrfc attribute
         in section element  39



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      rfc element  35
         category attribute  35
         consensus attribute  36
         docName attribute  36
         ipr attribute  36
         iprExtract attribute  37
         number attribute  37
         obsoletes attribute  37
         seriesNo attribute  37
         submissionType attribute  37
         updates attribute  38
         xml:lang attribute  38
      role attribute
         in author element  13

   S
      section attribute
         in xref element  49
      section element  38
         anchor attribute  39
         inside back  15
         inside middle  27
         inside section  39
         numbered attribute  39
         removeinrfc attribute  39
         title attribute  39
         toc attribute  39
      series attribute
         in reference element  34
      seriesInfo element  40
         name attribute  40
         value attribute  40
      seriesNo attribute
         in rfc element  37
      source attribute
         in cref element  17
      spacing attribute
         in dl element  19
         in ol element  28
         in ul element  47
      spanx element  40
         inside annotation  9
         inside c  16
         inside postamble  31
         inside preamble  32
         inside t  41
         style attribute  40
         xml:space attribute  40



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      src attribute
         in artwork element  11
         in figure element  22
      start attribute
         in ol element  28
      street element  41
         inside postal  30
      style attribute
         in list element  27
         in ol element  29
         in spanx element  40
         in texttable element  43
      subitem attribute
         in iref element  26
      submissionType attribute
         in rfc element  37
      suppress-title attribute
         in figure element  22
         in texttable element  43
      surname attribute
         in author element  14

   T
      t element  41
         anchor attribute  42
         inside abstract  8
         inside li  26
         inside list  27
         inside note  28
         inside section  38
      target attribute
         in eref element  21
         in format element  23
         in reference element  34
         in xref element  49
      texttable element  42
         align attribute  42
         anchor attribute  43
         inside section  38
         style attribute  43
         suppress-title attribute  43
         title attribute  43
      tindent element  44
         anchor attribute  44
         inside section  38
      title attribute
         in figure element  23
         in note element  28



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         in references element  35
         in section element  39
         in texttable element  43
      title element  44
         abbrev attribute  45
         inside front  23
      toc attribute
         in section element  39
      tt element  45
         inside annotation  9
         inside b  14
         inside blockquote  15
         inside c  16
         inside cref  17
         inside dd  19
         inside dt  20
         inside i  24
         inside innerRefContent  25
         inside li  27
         inside postamble  31
         inside preamble  32
         inside t  42
         inside tindent  44
      ttcol element  45
         align attribute  46
         inside texttable  42
         width attribute  46
      type attribute
         in artwork element  11
         in format element  23

   U
      ul element  46
         empty attribute  46
         inside dd  18
         inside li  26
         inside t  41
         spacing attribute  47
      updates attribute
         in rfc element  38
      uri element  47
         inside address  8

   V
      value attribute
         in seriesInfo element  40
      vspace element  47
         blankLines attribute  47



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         inside t  42

   W
      width attribute
         in artwork element  12
         in figure element  23
         in ttcol element  46
      workgroup element  47
         inside front  24

   X
      xml:lang attribute
         in artwork element  12
         in author element  14
         in rfc element  38
      xml:space attribute
         in artwork element  12
         in spanx element  40
      xref element  48
         format attribute  48
         inside annotation  9
         inside b  14
         inside c  16
         inside cref  17
         inside dd  18
         inside dt  20
         inside i  24
         inside li  27
         inside postamble  31
         inside preamble  32
         inside t  41
         inside tindent  44
         inside tt  45
         inside ttcol  45
         pageno attribute  49
         section attribute  49
         target attribute  49
      xref formats
         counter  48
         default  48
         none  48
         title  48

   Y
      year attribute
         in date element  18





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Author's Address

   Paul Hoffman
   VPN Consortium

   EMail: paul.hoffman@vpnc.org













































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