💾 Archived View for gemini.bortzmeyer.org › rfc-mirror › rfc7749.txt captured on 2021-12-04 at 18:04:22.
⬅️ Previous capture (2021-11-30)
-=-=-=-=-=-=-
Internet Architecture Board (IAB) J. Reschke
Request for Comments: 7749 greenbytes
Obsoletes: 2629 February 2016
Category: Informational
ISSN: 2070-1721
The "xml2rfc" Version 2 Vocabulary
Abstract
This document defines the "xml2rfc" version 2 vocabulary: an XML-
based language used for writing RFCs and Internet-Drafts.
Version 2 represents the state of the vocabulary (as implemented by
several tools and as used by the RFC Editor) around 2014.
This document obsoletes RFC 2629.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Architecture Board (IAB)
and represents information that the IAB has deemed valuable to
provide for permanent record. It represents the consensus of the
Internet Architecture Board (IAB). Documents approved for
publication by the IAB are not a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7749.
Copyright Notice
Copyright (c) 2016 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
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document.
Reschke Informational [Page 1]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Table of Contents
1. Introduction ....................................................4
1.1. Syntax Notation ............................................4
2. Elements ........................................................5
2.1. <abstract> .................................................5
2.2. <address> ..................................................5
2.3. <annotation> ...............................................6
2.4. <area> .....................................................6
2.5. <artwork> ..................................................7
2.6. <author> ..................................................10
2.7. <back> ....................................................11
2.8. <c> .......................................................12
2.9. <city> ....................................................12
2.10. <code> ...................................................12
2.11. <country> ................................................12
2.12. <cref> ...................................................13
2.13. <date> ...................................................14
2.14. <email> ..................................................15
2.15. <eref> ...................................................15
2.16. <facsimile> ..............................................16
2.17. <figure> .................................................16
2.18. <format> .................................................18
2.19. <front> ..................................................19
2.20. <iref> ...................................................20
2.21. <keyword> ................................................21
2.22. <list> ...................................................21
2.23. <middle> .................................................23
2.24. <note> ...................................................24
2.25. <organization> ...........................................24
2.26. <phone> ..................................................24
2.27. <postal> .................................................25
2.28. <postamble> ..............................................25
2.29. <preamble> ...............................................26
2.30. <reference> ..............................................26
2.31. <references> .............................................27
2.32. <region> .................................................28
2.33. <rfc> ....................................................28
2.34. <section> ................................................32
2.35. <seriesInfo> .............................................33
2.36. <spanx> ..................................................34
2.37. <street> .................................................35
2.38. <t> ......................................................35
2.39. <texttable> ..............................................36
2.40. <title> ..................................................38
2.41. <ttcol> ..................................................38
2.42. <uri> ....................................................39
Reschke Informational [Page 2]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.43. <vspace> .................................................39
2.44. <workgroup> ..............................................39
2.45. <xref> ...................................................40
3. Escaping for Use in XML ........................................42
4. Special Unicode Code Points ....................................42
5. Including Files ................................................43
6. Internationalization Considerations ............................44
7. Security Considerations ........................................44
8. IANA Considerations ............................................44
8.1. Internet Media Type Registration ..........................44
9. References .....................................................46
9.1. Normative References ......................................46
9.2. Informative References ....................................46
Appendix A. Front-Page ("Boilerplate") Generation .................50
A.1. The "category" Attribute ...................................50
A.2. The "ipr" Attribute ........................................50
A.2.1. Current Values: "*trust200902" .........................51
A.2.2. Historic Values ........................................52
A.3. The "submissionType" Attribute .............................54
A.4. The "consensus" Attribute ..................................55
Appendix B. Changes from RFC 2629 ("v1") ..........................56
B.1. Removed Elements ...........................................56
B.2. Changed Defaults ...........................................56
B.3. Changed Elements ...........................................57
B.4. New Elements ...............................................57
Appendix C. RELAX NG Schema .......................................58
C.1. Checking Validity ..........................................65
IAB Members at the Time of Approval ...............................66
Acknowledgments ...................................................66
Index .............................................................67
Author's Address ..................................................76
Reschke Informational [Page 3]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
1. Introduction
This document describes version 2 ("v2") of the "xml2rfc" vocabulary:
an XML-based language ("Extensible Markup Language" [XML]) used for
writing RFCs [RFC7322] and Internet-Drafts [IDGUIDE].
Version 2 represents the state of the vocabulary (as implemented by
several tools and as used by the RFC Editor) around 2014.
It obsoletes the original version ("v1") [RFC2629], which contained
the original language definition and which was subsequently extended.
Many of the changes leading to version 2 have been described in
"Writing I-Ds and RFCs using XML (revised)" [V1rev], but that
document has not been updated since 2008.
Processing Instructions (Section 2.6 of [XML]) generally are specific
to a given processor and thus are not considered to be part of the
vocabulary. See Section 4.1 of [TCLReadme] for a list of the
Processing Instructions supported by the first implementation of an
xml2rfc processor.
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 as index generation, populating a
keyword database, or syntax checks).
1.1. Syntax Notation
The XML vocabulary here is defined in prose, based on the RELAX NG
schema [RNC] contained in Appendix C (specified in RELAX NG Compact
Notation (RNC)).
Note that the schema can be used for automated validity checks, but
certain constraints are only described in prose (example: the
conditionally required presence of the "abbrev" attribute).
Reschke Informational [Page 4]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2. Elements
The sections below describe all elements and their attributes.
Note that attributes not labeled "mandatory" are optional.
Except inside <artwork>, horizontal whitespace and line breaks are
collapsed into a single whitespace, and leading and trailing
whitespace is trimmed off.
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 Section 4.3 of [RFC7322] for more information.
This element appears as a child element of <front> (Section 2.19).
Content model:
One or more <t> elements (Section 2.38)
2.2. <address>
Provides address information for the author.
This element appears as a child element of <author> (Section 2.6).
Content model:
In this order:
1. One optional <postal> element (Section 2.27)
2. One optional <phone> element (Section 2.26)
3. One optional <facsimile> element (Section 2.16)
4. One optional <email> element (Section 2.14)
5. One optional <uri> element (Section 2.42)
Reschke Informational [Page 5]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.3. <annotation>
Provides additional prose augmenting a bibliographical reference.
This element appears as a child element of <reference>
(Section 2.30).
Content model:
In any order:
o Text
o <xref> elements (Section 2.45)
o <eref> elements (Section 2.15)
o <iref> elements (Section 2.20)
o <cref> elements (Section 2.12)
o <spanx> elements (Section 2.36)
2.4. <area>
Provides information about the IETF area to which this document
relates (currently not used when generating documents).
The value ought to be either the full name or the abbreviation of one
of the IETF areas as listed on <https://www.ietf.org/iesg/area.html>.
The list at the time that this document is being published is
"Applications and Real-Time" ("art"), "General" ("gen"), "Internet"
("int"), "Operations and Management" ("ops"), "Routing" ("rtg"),
"Security" ("sec"), and "Transport" ("tsv").
Note that the set of IETF areas can change over time; for instance,
"Applications and Real-Time" ("art") replaced "Applications" ("app")
and "Real-time Applications and Infrastructure" ("rai") in 2015.
This element appears as a child element of <front> (Section 2.19).
Content model: only text content.
Reschke Informational [Page 6]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.5. <artwork>
This element allows the inclusion of "artwork" in the document.
<artwork> is the only element in the vocabulary that provides full
control of horizontal whitespace and line breaks; thus, it is used
for a variety of things, such as:
o diagrams ("line art"),
o source code,
o formal languages (such as ABNF [RFC5234] or the RNC notation used
in this document),
o message flow diagrams,
o complex tables, or
o protocol unit diagrams.
Note that processors differ in the handling of horizontal TAB
characters (some expand them, some treat them as single spaces), and
thus these ought to be avoided.
Alternatively, the "src" attribute allows referencing an external
graphics file, such as a bitmap or a vector drawing, using a URI
("Uniform Resource Identifier") [RFC3986]. In this case, the textual
content acts as a fallback for output formats that do not support
graphics; thus, it ought to contain either (1) a "line art" variant
of the graphics or (2) prose that describes the included image in
sufficient detail. Note that RFCs occasionally are published with
enhanced diagrams; [RFC5598] is a recent example of an RFC that was
published along with a PDF with images.
This element appears as a child element of <figure> (Section 2.17).
Content model:
Text
Reschke Informational [Page 7]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.5.1. "align" Attribute
Controls whether the artwork appears left justified (default),
centered, or right justified.
Allowed values:
o "left" (default)
o "center"
o "right"
2.5.2. "alt" Attribute
Alternative text description of the artwork (not just the caption).
2.5.3. "height" Attribute
The suggested height of the graphics (when it was included using the
"src" attribute).
This attribute is format dependent and ought to be avoided.
When generating HTML output [HTML], current implementations copy the
attribute "as is", thus effectively treating it as CSS (Cascading
Style Sheets) pixels (see Section 4.3.2 of [CSS]). 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 reference of a graphics file (Section 4.1 of [RFC3986]).
Note that this can be a "data" URI [RFC2397] as well, in which case
the graphics file is wholly part of the XML file.
Reschke Informational [Page 8]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.5.6. "type" Attribute
Specifies the type of the artwork.
The value is either an Internet Media Type (see [RFC2046]) or a
keyword (such as "abnf"). The set of recognized keywords varies
across implementations.
How it is used depends on context and application. For instance, a
formatter can attempt to syntax-highlight code in certain known
languages.
2.5.7. "width" Attribute
The suggested width of the graphics (when it was included using the
"src" attribute).
This attribute is format dependent and ought to be avoided.
When generating HTML output [HTML], current implementations copy the
attribute "as is", thus effectively treating it as CSS pixels (see
Section 4.3.2 of [CSS]). For other output formats, it is usually
ignored.
2.5.8. "xml:space" Attribute
Determines whitespace handling.
"preserve" is both the default value and the only meaningful setting
(because that's what the <artwork> element is for).
See also Section 2.10 of [XML].
Allowed values:
o "default"
o "preserve" (default)
Reschke Informational [Page 9]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.6. <author>
Provides information about a document's author. This is used both
for the document itself (at the beginning of the document) and for
referenced documents (inside of <reference>).
The <author> elements contained within the document's <front> element
are used to fill the boilerplate, and also to generate the "Author's
Address" section (see Section 4.12 of [RFC7322]).
Note that an "author" can also be just an organization (by not
specifying any of the name attributes, but adding the <organization>
child element).
Furthermore, the "role" attribute can be used to mark an author as
"editor". This is reflected on the front page and in the "Author's
Address" section, as well as in bibliographical references. Note
that this specification does not define a precise meaning for the
term "editor".
See Sections 4.10 and 4.11 of [RFC7322] for more information.
This element appears as a child element of <front> (Section 2.19).
Content model:
In this order:
1. One optional <organization> element (Section 2.25)
2. One optional <address> element (Section 2.2)
2.6.1. "fullname" Attribute
The full name (used in the automatically generated "Author's Address"
section).
2.6.2. "initials" Attribute
An abbreviated variant of the given name(s), to be used in
conjunction with the separately specified surname. It usually
appears on the front page, in footers, and in references.
Some processors will post-process the value -- for instance, when it
only contains a single letter (in which case they might add a
trailing dot). Relying on this kind of post-processing can lead to
results varying across formatters and thus ought to be avoided.
Reschke Informational [Page 10]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.6.3. "role" Attribute
Specifies the role the author had in creating the document.
Allowed values:
o "editor"
2.6.4. "surname" Attribute
The author's surname, to be used in conjunction with the separately
specified initials. It usually appears on the front page, in
footers, and in references.
2.7. <back>
Contains the "back" part of the document: the references and
appendices. In <back>, <section> elements indicate appendices.
This element appears as a child element of <rfc> (Section 2.33).
Content model:
In this order:
1. Optional <references> elements (Section 2.31)
2. Optional <section> elements (Section 2.34)
Reschke Informational [Page 11]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.8. <c>
Provides the content of a cell in a table.
This element appears as a child element of <texttable>
(Section 2.39).
Content model:
In any order:
o Text
o <xref> elements (Section 2.45)
o <eref> elements (Section 2.15)
o <iref> elements (Section 2.20)
o <cref> elements (Section 2.12)
o <spanx> elements (Section 2.36)
2.9. <city>
Gives the city name in a postal address.
This element appears as a child element of <postal> (Section 2.27).
Content model: only text content.
2.10. <code>
Gives the postal region code.
This element appears as a child element of <postal> (Section 2.27).
Content model: only text content.
2.11. <country>
Gives the country in a postal address.
This element appears as a child element of <postal> (Section 2.27).
Content model: only text content.
Reschke Informational [Page 12]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.12. <cref>
Represents a comment.
Comments can be used in a document while it is a work in progress.
They usually appear (1) inline and visually highlighted, (2) at the
end of the document (depending on file format and settings of the
formatter), or (3) not at all (when generating an RFC).
This element appears as a child element of <annotation>
(Section 2.3), <c> (Section 2.8), <postamble> (Section 2.28),
<preamble> (Section 2.29), and <t> (Section 2.38).
Content model: only text content.
2.12.1. "anchor" Attribute
Document-wide unique identifier for this comment. The processor will
autogenerate an identifier when none is given.
The value needs to be a valid XML "Name" (Section 2.3 of [XML]),
additionally constrained to US-ASCII characters [USASCII].
2.12.2. "source" Attribute
Holds the "source" of a comment, such as the name or the initials of
the person who made the comment.
Reschke Informational [Page 13]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.13. <date>
Provides information about the publication date.
Note that this element is used for the boilerplate of the document
being produced, and also inside bibliographic references.
In the "boilerplate" case, it defines the publication date, which,
when producing Internet-Drafts, will be used for computing the
expiration date (see Section 8 of [IDGUIDE]). When one or more of
"year", "month", or "day" are left out, the processor will attempt to
use the current system date if the attributes that are present are
consistent with that date.
Note that in this case, 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 case of bibliographic references, the date information can
have prose text for the month or year. For example, vague dates
(year="ca. 2000"), date ranges (year="2012-2013"), non-specific
months (month="Second quarter") and so on are allowed.
This element appears as a child element of <front> (Section 2.19).
Content model: this element does not have any contents.
2.13.1. "day" Attribute
In the "boilerplate" case, the day of publication; this is a number.
Otherwise, an indication of the publication day, with the format not
being restricted.
2.13.2. "month" Attribute
In the "boilerplate" case, the month of publication; this is the
English name of the month. Otherwise, an indication of the
publication month, with the format not being restricted.
2.13.3. "year" Attribute
In the "boilerplate" case, the year of publication; this is a number
(usually four-digit). Otherwise, an indication of the publication
year, with the format not being restricted.
Reschke Informational [Page 14]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.14. <email>
Provides an email address.
The value is expected to be an email address conforming to the
addr-spec definition in Section 2 of [RFC6068] (so does not include
the prefix "mailto:").
This element appears as a child element of <address> (Section 2.2).
Content model: only text content.
2.15. <eref>
Represents an "external" link (as specified in the "target"
attribute).
If the element has no text content, the value of the "target"
attribute will be inserted in angle brackets (as described in
Appendix C of [RFC3986]) and, depending on the capabilities of the
output format, hyperlinked.
Otherwise, the text content will be used (and potentially
hyperlinked). Depending on output format and formatter, additional
text might be inserted (such as a "URI" counter, and a "URIs" section
in the back of the document). Avoid this variant when consistent
rendering across formats and formatters is desired.
This element appears as a child element of <annotation>
(Section 2.3), <c> (Section 2.8), <postamble> (Section 2.28),
<preamble> (Section 2.29), and <t> (Section 2.38).
Content model: only text content.
2.15.1. "target" Attribute (Mandatory)
URI of the link target (see Section 3 of [RFC3986]).
Reschke Informational [Page 15]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.16. <facsimile>
Represents the phone number of a fax machine.
The value is expected to be the scheme-specific part of a "tel" URI
(so does not include the prefix "tel:"), using the "global numbers"
syntax. See Section 3 of [RFC3966] for details.
This element appears as a child element of <address> (Section 2.2).
Content model: only text content.
2.17. <figure>
This element is used to represent a figure, consisting of an optional
preamble, the actual figure, an optional postamble, and an optional
title.
This element appears as a child element of <section> (Section 2.34)
and <t> (Section 2.38).
Content model:
In this order:
1. Optional <iref> elements (Section 2.20)
2. One optional <preamble> element (Section 2.29)
3. One <artwork> element (Section 2.5)
4. One optional <postamble> element (Section 2.28)
2.17.1. "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"
Reschke Informational [Page 16]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.17.2. "alt" Attribute
Duplicates functionality available on <artwork>; avoid it.
2.17.3. "anchor" Attribute
Document-wide unique identifier for this figure.
Furthermore, the presence of this attribute causes the figure to be
numbered.
The value needs to be a valid XML "Name" (Section 2.3 of [XML]).
2.17.4. "height" Attribute
Duplicates functionality available on <artwork>; avoid it.
2.17.5. "src" Attribute
Duplicates functionality available on <artwork>; avoid it.
2.17.6. "suppress-title" Attribute
Figures that have an "anchor" attribute will automatically get an
autogenerated title (such as "Figure 1"), even if the "title"
attribute is absent. Setting this attribute to "true" will prevent
this.
Allowed values:
o "true"
o "false" (default)
2.17.7. "title" Attribute
The title for the figure; this usually appears on a line after the
figure.
2.17.8. "width" Attribute
Duplicates functionality available on <artwork>; avoid it.
Reschke Informational [Page 17]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.18. <format>
Provides a link to an additional format variant for a reference.
Note that these additional links are neither used in published RFCs
nor supported by all tools. If the goal is to provide a single URI
for a reference, the "target" attribute on <reference> can be used
instead.
This element appears as a child element of <reference>
(Section 2.30).
Content model: this element does not have any contents.
2.18.1. "octets" Attribute
Octet length of linked-to document.
2.18.2. "target" Attribute
URI of document.
2.18.3. "type" Attribute (Mandatory)
The type of the linked-to document, such as "TXT", "HTML", or "PDF".
Reschke Informational [Page 18]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.19. <front>
Represents the "front matter": metadata (such as author information),
the Abstract, and additional notes.
This element appears as a child element of <reference> (Section 2.30)
and <rfc> (Section 2.33).
Content model:
In this order:
1. One <title> element (Section 2.40)
2. One or more <author> elements (Section 2.6)
3. One <date> element (Section 2.13)
4. Optional <area> elements (Section 2.4)
5. Optional <workgroup> elements (Section 2.44)
6. Optional <keyword> elements (Section 2.21)
7. One optional <abstract> element (Section 2.1)
8. Optional <note> elements (Section 2.24)
Reschke Informational [Page 19]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.20. <iref>
Provides terms for the document's index.
Index entries can be either regular entries (when just the "item"
attribute is given) or nested entries (by specifying "subitem" as
well), grouped under a regular entry.
In this document, for instance, every element definition appears as a
regular index entry ("iref element 2.20"). In addition, for each use
of that element inside another parent element, a nested entry was
added ("iref element 2.20, ... inside annotation 2.3").
Index entries generally refer to the exact place where the <iref>
element occurred. An exception is the occurrence as a child element
of <section>, in which case the whole section is considered to be
relevant for that index entry. In some formats, index entries of
this type might be displayed as ranges.
This element appears as a child element of <annotation>
(Section 2.3), <c> (Section 2.8), <figure> (Section 2.17),
<postamble> (Section 2.28), <preamble> (Section 2.29), <section>
(Section 2.34), and <t> (Section 2.38).
Content model: this element does not have any contents.
2.20.1. "item" Attribute (Mandatory)
The item to include.
2.20.2. "primary" Attribute
Setting this to "true" declares the occurrence as "primary", which
might cause it to be highlighted in the index.
Allowed values:
o "true"
o "false" (default)
2.20.3. "subitem" Attribute
The subitem to include.
Reschke Informational [Page 20]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.21. <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 documents.
This element appears as a child element of <front> (Section 2.19).
Content model: only text content.
2.22. <list>
Delineates a text list.
Each list item is represented by a <t> element. The vocabulary
currently does not directly support list items consisting of multiple
paragraphs; if this is needed, <vspace> (Section 2.43) can be used as
a workaround.
This element appears as a child element of <t> (Section 2.38).
Content model:
One or more <t> elements (Section 2.38)
2.22.1. "counter" Attribute
This attribute holds a token that serves as an identifier for a
counter. The intended use is continuation of lists, where the
counter will be incremented for every list item, and there is no way
to reset the counter.
Note that this attribute functions only when the "style" attribute is
using the "format..." syntax (Section 2.22.3); otherwise, it is
ignored.
Reschke Informational [Page 21]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.22.2. "hangIndent" Attribute
For list styles with potentially wide labels, this attribute can
override the default indentation level, measured in number of
characters.
Note that it only affects styles with variable-width labels
("format..." and "hanging"; see below), and it may not affect formats
in which the list item text appears _below_ the label.
2.22.3. "style" Attribute
This attribute is used to control the display of a list.
The value of this attribute is inherited by any nested lists that do
not have this attribute set. It may be set to:
"empty"
For unlabeled list items; it can also be used for indentation
purposes (this is the default value when there is an enclosing
list where the style is specified).
"hanging"
For lists where the items are labeled with a piece of text.
The label text is specified in the "hangText" attribute of the <t>
element (Section 2.38.2).
"letters"
For ordered lists using letters as labels (lowercase letters
followed by a period; after "z", it rolls over to a two-letter
format). For nested lists, processors usually flip between
uppercase and lowercase.
"numbers"
For ordered lists using numbers as labels.
"symbols"
For unordered (bulleted) lists.
The style of the bullets is chosen automatically by the processor
(some implementations allow overriding the default using a
Processing Instruction).
Reschke Informational [Page 22]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
And finally:
"format ..."
For lists with customized labels, consisting of fixed text and an
item counter in various formats.
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 a decimal number.
The following formats are supported:
%c lowercase letters (a, b, c, etc.)
%C uppercase letters (A, B, C, etc.)
%d decimal numbers (1, 2, 3, etc.)
%i lowercase Roman numerals (i, ii, iii, etc.)
%I uppercase Roman numerals (I, II, III, etc.)
%% represents a percent sign
Other formats are reserved for future use.
2.23. <middle>
Represents the main content of the document.
This element appears as a child element of <rfc> (Section 2.33).
Content model:
One or more <section> elements (Section 2.34)
Reschke Informational [Page 23]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.24. <note>
Creates an unnumbered section that appears after the Abstract.
It is usually used for additional information to reviewers (working
group information, mailing list, ...), or for additional publication
information such as "IESG Notes".
This element appears as a child element of <front> (Section 2.19).
Content model:
One or more <t> elements (Section 2.38)
2.24.1. "title" Attribute (Mandatory)
The title of the note.
2.25. <organization>
Specifies the affiliation (Section 4.1.2 of [RFC7322]) of an author.
This information appears both in the "Author's Address" section and
on the front page (see Section 4.1.1 of [RFC7322] for more
information). If the value is long, an abbreviated variant can be
specified in the "abbrev" attribute.
This element appears as a child element of <author> (Section 2.6).
Content model: only text content.
2.25.1. "abbrev" Attribute
Abbreviated variant.
2.26. <phone>
Represents a phone number.
The value is expected to be the scheme-specific part of a "tel" URI
(so does not include the prefix "tel:"), using the "global numbers"
syntax. See Section 3 of [RFC3966] for details.
This element appears as a child element of <address> (Section 2.2).
Content model: only text content.
Reschke Informational [Page 24]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.27. <postal>
Contains child elements providing postal information.
Note that at least one <street> element needs to be present; however,
formatters will handle empty values just fine.
This element appears as a child element of <address> (Section 2.2).
Content model:
In this order:
1. One or more <street> elements (Section 2.37)
2. In any order:
* <city> elements (Section 2.9)
* <region> elements (Section 2.32)
* <code> elements (Section 2.10)
* <country> elements (Section 2.11)
2.28. <postamble>
Gives text that appears at the bottom of a figure or table.
This element appears as a child element of <figure> (Section 2.17)
and <texttable> (Section 2.39).
Content model:
In any order:
o Text
o <xref> elements (Section 2.45)
o <eref> elements (Section 2.15)
o <iref> elements (Section 2.20)
o <cref> elements (Section 2.12)
o <spanx> elements (Section 2.36)
Reschke Informational [Page 25]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.29. <preamble>
Gives text that appears at the top of a figure or table.
This element appears as a child element of <figure> (Section 2.17)
and <texttable> (Section 2.39).
Content model:
In any order:
o Text
o <xref> elements (Section 2.45)
o <eref> elements (Section 2.15)
o <iref> elements (Section 2.20)
o <cref> elements (Section 2.12)
o <spanx> elements (Section 2.36)
2.30. <reference>
Represents a bibliographical reference.
This element appears as a child element of <references>
(Section 2.31).
Content model:
In this order:
1. One <front> element (Section 2.19)
2. Optional <seriesInfo> elements (Section 2.35)
3. Optional <format> elements (Section 2.18)
4. Optional <annotation> elements (Section 2.3)
Reschke Informational [Page 26]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.30.1. "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.
The value needs to be a valid XML "Name" (Section 2.3 of [XML]),
additionally constrained to US-ASCII characters [USASCII]. Thus, the
character repertoire consists of "A-Z", "a-z", "0-9", "_", "-", ".",
and ":", where "0-9", ".", and "-" are disallowed as start
characters.
2.30.2. "target" Attribute
Holds the URI for the reference.
Note that, depending on the <seriesInfo> element, a URI might not be
needed and might not be desirable, as it can be automatically
generated (for instance, for RFCs).
2.31. <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 Section 4.8.6 of [RFC7322]. This vocabulary supports
the split with the "title" attribute.
By default, the order of references is significant. Processors,
however, can be instructed to sort them based on their anchor names.
This element appears as a child element of <back> (Section 2.7).
Content model:
One or more <reference> elements (Section 2.30)
2.31.1. "title" Attribute
Provides the title for the "References" section (defaulting to
"References").
In general, the title should be either "Normative References" or
"Informative References".
Reschke Informational [Page 27]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.32. <region>
Provides the region name in a postal address.
This element appears as a child element of <postal> (Section 2.27).
Content model: only text content.
2.33. <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 documents but is
out of scope for this specification.
Content model:
In this order:
1. One <front> element (Section 2.19)
2. One <middle> element (Section 2.23)
3. One optional <back> element (Section 2.7)
2.33.1. "category" Attribute
Document category (see Appendix A.1).
Allowed values:
o "std"
o "bcp"
o "info"
o "exp"
o "historic"
Reschke Informational [Page 28]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.33.2. "consensus" Attribute
Affects the generated boilerplate.
See [RFC5741] for more information.
Allowed values:
o "no"
o "yes"
2.33.3. "docName" Attribute
For Internet-Drafts, this specifies the draft name (which appears
below the title).
A processor should give an error if both the "docName" and "number"
attributes are given in the <rfc> element.
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 Section 7 of [IDGUIDE] for further information.
Reschke Informational [Page 29]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.33.4. "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"
o "noDerivatives3667"
o "full3978"
o "noModification3978"
o "noDerivatives3978"
o "trust200811"
o "noModificationTrust200811"
o "noDerivativesTrust200811"
o "trust200902"
o "noModificationTrust200902"
o "noDerivativesTrust200902"
o "pre5378Trust200902"
2.33.5. "iprExtract" Attribute
Identifies a single section within the document (by its "anchor"
attribute) for which extraction "as is" is explicitly allowed (this
is only relevant for historic values of the "ipr" attribute).
Reschke Informational [Page 30]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.33.6. "number" Attribute
The number of the RFC to be produced.
A processor should give an error if both the "docName" and "number"
attributes are given in the <rfc> element.
2.33.7. "obsoletes" Attribute
A comma-separated list of RFC _numbers_ or Internet-Draft names.
Processors ought to parse the attribute value, so that incorrect
references can be detected and, depending on output format,
hyperlinks can be generated. Also, the value ought to be reformatted
to insert whitespace after each comma if not already present.
2.33.8. "seriesNo" Attribute
Number within a document series.
The document series is defined by the "category" attribute;
"seriesNo" is only applicable to the values "info" ("FYI" series),
"std" ("STD" series), and "bcp" ("BCP" series).
2.33.9. "submissionType" Attribute
The document stream.
See Section 2 of [RFC5741] for details.
Allowed values:
o "IETF" (default)
o "IAB"
o "IRTF"
o "independent"
2.33.10. "updates" Attribute
A comma-separated list of RFC _numbers_ or Internet-Draft names.
Processors ought to parse the attribute value, so that incorrect
references can be detected and, depending on output format,
hyperlinks can be generated. Also, the value ought to be reformatted
to insert whitespace after each comma if not already present.
Reschke Informational [Page 31]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.33.11. "xml:lang" Attribute
The natural language used in the document (defaults to "en").
See Section 2.12 of [XML] for more information.
2.34. <section>
Represents a section (when inside a <middle> element) or an appendix
(when inside a <back> element).
Subsections are created by nesting <section> elements inside
<section> elements.
This element appears as a child element of <back> (Section 2.7),
<middle> (Section 2.23), and <section> (Section 2.34).
Content model:
In this order:
1. In any order:
* <t> elements (Section 2.38)
* <figure> elements (Section 2.17)
* <texttable> elements (Section 2.39)
* <iref> elements (Section 2.20)
2. Optional <section> elements (Section 2.34)
2.34.1. "anchor" Attribute
Document-wide unique identifier for this section.
The value needs to be a valid XML "Name" (Section 2.3 of [XML]).
2.34.2. "title" Attribute (Mandatory)
The title of the section.
Reschke Informational [Page 32]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.34.3. "toc" Attribute
Determines whether the section is included in the Table of Contents.
The processor usually has defaults for whether a Table of Contents
will be produced at all, and sections of which maximal depth will be
included (frequently: 3). "include" and "exclude" allow overriding
the processor's default behavior for the element they are specified
on (they do not affect either nested or parent elements).
Allowed values:
o "include"
o "exclude"
o "default" (default)
2.35. <seriesInfo>
Specifies the document series in which this document appears, and
also specifies an identifier within that series.
This element appears as a child element of <reference>
(Section 2.30).
Content model: this element does not have any contents.
2.35.1. "name" Attribute (Mandatory)
The name of the series.
Some series names might trigger specific processing (such as for
autogenerating links, inserting descriptions such as "work in
progress", or additional functionality like reference diagnostics).
Examples for IETF-related series names are "BCP", "FYI",
"Internet-Draft", "RFC", and "STD".
2.35.2. "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).
Reschke Informational [Page 33]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.36. <spanx>
Wraps a piece of text, indicating special formatting styles.
When generating plain text, processors usually emulate font changes
using characters such as "*" and "_".
The following styles are defined:
emph Simple emphasis (this is the default).
strong Strong emphasis.
verb "Verbatim" text (usually displayed using a monospaced
font face).
This element appears as a child element of <annotation>
(Section 2.3), <c> (Section 2.8), <postamble> (Section 2.28),
<preamble> (Section 2.29), and <t> (Section 2.38).
Content model: only text content.
2.36.1. "style" Attribute
The style to be used (defaults to "emph").
2.36.2. "xml:space" Attribute
Determines whitespace handling.
According to the DTD, the default value is "preserve". However,
tests show that it doesn't have any effect on processing; thus, this
attribute will be removed in future versions of the vocabulary.
See also Section 2.10 of [XML].
Allowed values:
o "default"
o "preserve" (default)
Reschke Informational [Page 34]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.37. <street>
Provides a street address.
This element appears as a child element of <postal> (Section 2.27).
Content model: only text content.
2.38. <t>
Contains a paragraph of text.
This element appears as a child element of <abstract> (Section 2.1),
<list> (Section 2.22), <note> (Section 2.24), and <section>
(Section 2.34).
Content model:
In any order:
o Text
o <list> elements (Section 2.22)
o <figure> elements (Section 2.17)
o <xref> elements (Section 2.45)
o <eref> elements (Section 2.15)
o <iref> elements (Section 2.20)
o <cref> elements (Section 2.12)
o <spanx> elements (Section 2.36)
o <vspace> elements (Section 2.43)
2.38.1. "anchor" Attribute
Document-wide unique identifier for this paragraph.
The value needs to be a valid XML "Name" (Section 2.3 of [XML]).
2.38.2. "hangText" Attribute
Holds the label ("hanging text") for items in lists using the
"hanging" style (see Section 2.22.3).
Reschke Informational [Page 35]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.39. <texttable>
Contains a table, consisting of an optional preamble, a header line,
rows, an optional postamble, and an optional title.
The number of columns in the table is determined by the number of
<ttcol> elements. The number of rows in the table is determined by
the number of <c> elements divided by the number of columns. There
is no requirement that the number of <c> elements be evenly divisible
by the number of columns.
This element appears as a child element of <section> (Section 2.34).
Content model:
In this order:
1. One optional <preamble> element (Section 2.29)
2. One or more <ttcol> elements (Section 2.41)
3. Optional <c> elements (Section 2.8)
4. One optional <postamble> element (Section 2.28)
2.39.1. "align" Attribute
Determines the horizontal alignment of the table.
Allowed values:
o "left"
o "center" (default)
o "right"
2.39.2. "anchor" Attribute
Document-wide unique identifier for this table.
Furthermore, the presence of this attribute causes the table to be
numbered.
The value needs to be a valid XML "Name" (Section 2.3 of [XML]).
Reschke Informational [Page 36]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.39.3. "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)
2.39.4. "suppress-title" Attribute
Tables that have an "anchor" attribute will automatically get an
autogenerated title (such as "Table 1"), even if the "title"
attribute is absent. Setting this attribute to "true" will
prevent this.
Allowed values:
o "true"
o "false" (default)
2.39.5. "title" Attribute
The title for the table; this usually appears on a line below the
table body.
Reschke Informational [Page 37]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.40. <title>
Represents the document title.
When this element appears in the <front> element of the current
document, the title might also appear in page headers or footers. If
it's long (~40 characters), the "abbrev" attribute is used to specify
an abbreviated variant.
This element appears as a child element of <front> (Section 2.19).
Content model: only text content.
2.40.1. "abbrev" Attribute
Specifies an abbreviated variant of the document title.
2.41. <ttcol>
Contains a column heading in a table.
This element appears as a child element of <texttable>
(Section 2.39).
Content model: only text content.
2.41.1. "align" Attribute
Determines the horizontal alignment within the table column.
Allowed values:
o "left" (default)
o "center"
o "right"
2.41.2. "width" Attribute
The desired column width (as integer 0..100 followed by "%").
Reschke Informational [Page 38]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.42. <uri>
Contains a web address associated with the author.
The contents should be a valid URI (see Section 3 of [RFC3986]).
This element appears as a child element of <address> (Section 2.2).
Content model: only text content.
2.43. <vspace>
This element can be used to force the inclusion of a single line
break or multiple blank lines.
Note that this is a purely presentational element; thus, its use
ought to be avoided, except within a <list> as discussed in
Section 2.22.
This element appears as a child element of <t> (Section 2.38).
Content model: this element does not have any contents.
2.43.1. "blankLines" Attribute
Number of blank lines to be inserted, where "0" indicates a single
line break (defaults to "0").
For paged output formats, no additional blank lines should be
generated after a page break.
2.44. <workgroup>
This element is used to specify the Working Group (IETF) or Research
Group (IRTF) from which the document originates, if any. The
recommended format is the official name of the Working Group (with
some capitalization).
In Internet-Drafts, this is used in the upper left corner of the
boilerplate, replacing the default "Network Working Group" string.
Formatting software can append the words "Working Group" or "Research
Group", depending on the "submissionType" property of the <rfc>
element (Section 2.33.9).
This element appears as a child element of <front> (Section 2.19).
Content model: only text content.
Reschke Informational [Page 39]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
2.45. <xref>
Inserts a cross-reference to a different part of a document.
The generated text depends on (1) whether the <xref> is empty (in
which case the processor will try to generate a meaningful text
fragment), (2) the "format" attribute, and (3) the nature (XML
element type) 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 combination of prose and contained
text content is sufficient for a reader to understand what is being
referred to.
This element appears as a child element of <annotation>
(Section 2.3), <c> (Section 2.8), <postamble> (Section 2.28),
<preamble> (Section 2.29), and <t> (Section 2.38).
Content model: only text content.
2.45.1. "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, table,
or list item.
For targets that are not inherently numbered, such as references
or comments, it uses the anchor name instead.
"default"
Inserts a text fragment that describes the referenced part
completely, such as "Section 2", "Table 4", or "[XML]".
"none"
There will be no autogenerated text.
Reschke Informational [Page 40]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
"title"
Inserts a title for the referenced element (usually obtained from
the referenced element's "title" attribute; some processors also
use the <title> child element or a <reference> target).
Not all combinations of text content, "format" attribute, and type of
referenced part lead to predictable results across different
formatters. In case this matters, the following combinations need to
be avoided:
o Non-empty text content with any format other than "none".
o Empty text content with format "counter" for any target that isn't
inherently numbered.
o Empty text content with format "title" for any target that doesn't
have a title.
Allowed values:
o "counter"
o "title"
o "none"
o "default" (default)
2.45.2. "pageno" Attribute
Unused.
It's unclear what the purpose of this attribute is; processors seem
to ignore it, and it never was documented.
Allowed values:
o "true"
o "false" (default)
2.45.3. "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.
Reschke Informational [Page 41]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
3. Escaping for Use in XML
Text in XML cannot use the literal characters "<" and "&", as they
have special meaning to the XML processor (starting entities,
elements, etc.). Usually, these characters will need to be
substituted by "<" and "&" (see Section 4.6 of [XML]).
">" does not require escaping, unless it appears in the sequence
"]]>" (which indicates the end of a CDATA section; see below).
Escaping the individual characters can be a lot of work (when done
manually) and also messes up alignment in artwork. Another approach
to escaping is to use CDATA sections (Section 2.7 of [XML]). Within
these, no further escaping is needed, except when the "end-of-CDATA"
marker needs to be used (in that case, the CDATA section needs to be
closed, and a new one needs to be started).
4. Special Unicode Code Points
Although the current RFC format does not allow non-ASCII Unicode
characters [UNICODE], some of them can be used to enforce certain
behaviors of formatters.
For instance:
non-breaking space (U+00A0)
Represents a space character where no line break should happen.
This is frequently used in titles (by excluding certain space
characters from the line-breaking algorithm, the processor will
use the remaining whitespace occurrences for line breaks).
non-breaking hyphen (U+2011)
Similarly, this represents a hyphen character where no line
breaking ought to occur.
word joiner (U+2060)
Also called "zero width non-breaking space" -- can be used to
disallow line breaking between two non-whitespace characters.
Reschke Informational [Page 42]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Note that in order to use these characters by name, they need to be
declared in either the Document Type Definition (DTD) or the
"internal subset" (Section 2.8 of [XML]), like this:
<?xml version="1.0"?>
<!DOCTYPE rfc [
<!-- declare nbsp and friends -->
<!ENTITY nbsp " ">
<!ENTITY nbhy "‑">
<!ENTITY wj "⁠">
]>
5. Including Files
This version of the vocabulary does not support an inclusion
mechanism on its own -- thus, a document always needs to be
self-contained.
That being said, some processors do support file inclusion using
Processing Instructions (Section 2.6 of [XML] and Section 4.1.2 of
[TCLReadme]).
Furthermore, XML itself allows inclusion of external content using
the "internal subset" (Section 2.8 of [XML]). Unfortunately, this
requires declaring the external data in the DTD upfront.
For instance:
<?xml version="1.0"?>
<!DOCTYPE rfc [
<!-- allow later RFC 2629 reference using "&rfc2629;" -->
<!-- the data will be fetched from xml2rfc.ietf.org -->
<!ENTITY rfc2629 PUBLIC
"http://xml2rfc.ietf.org/public/rfc/bibxml/reference.RFC.2629.xml">
]>
...declares the entity "rfc2629", which then can be used in the
"References" section:
<references>
&rfc2629;
</references>
Reschke Informational [Page 43]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Note that this mechanism only works for well-formed XML fragments;
thus, any plain text that would need to be escaped in XML can't be
included as is.
6. Internationalization Considerations
This format is based on [XML] and 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
characters (see [USASCII] and Section 3 of [RFC2223]). It is
possible that this rule will be relaxed in future revisions of the
RFC format (for instance, to allow non-ASCII characters in examples
and contact information). In that case, it is expected that the
vocabulary will be extended accordingly.
7. Security Considerations
The "name" attribute of 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, the nature of XML, plus vocabulary features such as
typed artwork, make it attractive to extract content from documents
for further processing, such as for the purpose of checking syntax or
computing/verifying examples. In the latter case, care needs to be
taken that only trusted content is processed.
All security considerations related to XML processing are relevant as
well (see Section 7 of [RFC3470]).
8. IANA Considerations
8.1. 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 has been registered with IANA.
Type name: application
Subtype name: rfc+xml
Required parameters: There are no required parameters.
Reschke Informational [Page 44]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Optional parameters: "charset": This parameter has identical
semantics to the charset parameter of the "application/xml"
Media Type specified in Section 9.1 of [RFC7303].
Encoding considerations: Identical to those of "application/xml" as
described in Section 9.1 of [RFC7303].
Security considerations: As defined in Section 7. In addition, as
this media type uses the "+xml" convention, it inherits the
security considerations described in Section 10 of [RFC7303].
Interoperability considerations: Some aspects of this vocabulary
currently cannot be used interoperably; among the reasons for this
are that they weren't precisely defined in the first place, that
they have been added in an ad hoc fashion later on, or that they
are specific to certain output formats. This specification
attempts to identify these cases in the description of the
individual elements/attributes.
Published specification: This specification.
Applications that use this media type: Applications that 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 used as
shorthand pointers, as described in Section 3.2 of [XPOINTER].
Additional information:
Deprecated alias names for this type: None.
Magic number(s): As specified for "application/xml" in
Section 9.1 of [RFC7303].
File extension(s): .xml or .rfcxml when disambiguation from other
XML files is needed.
Macintosh file type code(s): TEXT
Person & email address to contact for further information: See the
Author's Address section of RFC 7749.
Intended usage: COMMON
Restrictions on usage: None.
Reschke Informational [Page 45]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Author: See the Author's Address section of RFC 7749.
Change controller: RFC Series Editor (rse@rfc-editor.org)
9. References
9.1. Normative References
[RFC2046] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
Extensions (MIME) Part Two: Media Types", RFC 2046,
DOI 10.17487/RFC2046, November 1996,
<http://www.rfc-editor.org/info/rfc2046>.
[RFC3966] Schulzrinne, H., "The tel URI for Telephone Numbers",
RFC 3966, DOI 10.17487/RFC3966, December 2004,
<http://www.rfc-editor.org/info/rfc3966>.
[RFC6068] Duerst, M., Masinter, L., and J. Zawinski, "The 'mailto'
URI Scheme", RFC 6068, DOI 10.17487/RFC6068, October 2010,
<http://www.rfc-editor.org/info/rfc6068>.
[RFC7303] Thompson, H. and C. Lilley, "XML Media Types", RFC 7303,
DOI 10.17487/RFC7303, July 2014,
<http://www.rfc-editor.org/info/rfc7303>.
[XML] Bray, T., Paoli, J., Sperberg-McQueen, C., Maler, E., and
F. Yergeau, "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>.
9.2. Informative References
[BCP13] Freed, N., Klensin, J., and T. Hansen, "Media Type
Specifications and Registration Procedures", BCP 13,
RFC 6838, January 2013,
<http://www.rfc-editor.org/info/bcp13>.
[CSS] Bos, B., Celic, T., Hickson, I., and H. Lie, "Cascading
Style Sheets Level 2 Revision 1 (CSS 2.1) Specification",
W3C Recommendation REC-CSS2-20110607, June 2011,
<http://www.w3.org/TR/2011/REC-CSS2-20110607/>.
Latest version available at <http://www.w3.org/TR/CSS2>.
Reschke Informational [Page 46]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
[HTML] Hickson, I., Berjon, R., Faulkner, S., Leithead, T., Doyle
Navara, E., O'Connor, E., and S. Pfeiffer, "HTML5", W3C
Recommendation REC-html5-20141028, October 2014,
<http://www.w3.org/TR/2014/REC-html5-20141028/>.
Latest version available at <http://www.w3.org/TR/html5/>.
[IDGUIDE] Housley, R., "Guidelines to Authors of Internet-Drafts",
December 2010,
<http://www.ietf.org/id-info/guidelines.html>.
[JING] Thai Open Source Software Center Ltd, "Jing - A RELAX NG
validator in Java", 2008,
<http://www.thaiopensource.com/relaxng/jing.html>.
Downloads: <https://code.google.com/p/jing-trang/
downloads/list>.
[RFC2026] Bradner, S., "The Internet Standards Process --
Revision 3", BCP 9, RFC 2026, DOI 10.17487/RFC2026,
October 1996, <http://www.rfc-editor.org/info/rfc2026>.
[RFC2223] Postel, J. and J. Reynolds, "Instructions to RFC Authors",
RFC 2223, DOI 10.17487/RFC2223, October 1997,
<http://www.rfc-editor.org/info/rfc2223>.
[RFC2397] Masinter, L., "The "data" URL scheme", RFC 2397,
DOI 10.17487/RFC2397, August 1998,
<http://www.rfc-editor.org/info/rfc2397>.
[RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
DOI 10.17487/RFC2629, June 1999,
<http://www.rfc-editor.org/info/rfc2629>.
[RFC3470] Hollenbeck, S., Rose, M., and L. Masinter, "Guidelines for
the Use of Extensible Markup Language (XML) within IETF
Protocols", BCP 70, RFC 3470, DOI 10.17487/RFC3470,
January 2003, <http://www.rfc-editor.org/info/rfc3470>.
[RFC3667] Bradner, S., "IETF Rights in Contributions", RFC 3667,
DOI 10.17487/RFC3667, February 2004,
<http://www.rfc-editor.org/info/rfc3667>.
[RFC3978] Bradner, S., Ed., "IETF Rights in Contributions",
RFC 3978, DOI 10.17487/RFC3978, March 2005,
<http://www.rfc-editor.org/info/rfc3978>.
Reschke Informational [Page 47]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, DOI 10.17487/RFC3986, January 2005,
<http://www.rfc-editor.org/info/rfc3986>.
[RFC5234] Crocker, D., Ed., and P. Overell, "Augmented BNF for
Syntax Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008,
<http://www.rfc-editor.org/info/rfc5234>.
[RFC5378] Bradner, S., Ed., and J. Contreras, Ed., "Rights
Contributors Provide to the IETF Trust", BCP 78, RFC 5378,
DOI 10.17487/RFC5378, November 2008,
<http://www.rfc-editor.org/info/rfc5378>.
[RFC5598] Crocker, D., "Internet Mail Architecture", RFC 5598,
DOI 10.17487/RFC5598, July 2009,
<http://www.rfc-editor.org/info/rfc5598>.
PDF version: <http://www.rfc-editor.org/rfc/rfc5598.pdf>
[RFC5741] Daigle, L., Ed., Kolkman, O., Ed., and IAB, "RFC Streams,
Headers, and Boilerplates", RFC 5741,
DOI 10.17487/RFC5741, December 2009,
<http://www.rfc-editor.org/info/rfc5741>.
[RFC6266] Reschke, J., "Use of the Content-Disposition Header Field
in the Hypertext Transfer Protocol (HTTP)", RFC 6266,
DOI 10.17487/RFC6266, June 2011,
<http://www.rfc-editor.org/info/rfc6266>.
[RFC7322] Flanagan, H. and S. Ginoza, "RFC Style Guide", RFC 7322,
DOI 10.17487/RFC7322, September 2014,
<http://www.rfc-editor.org/info/rfc7322>.
[RNC] Clark, J., "RELAX NG Compact Syntax", OASIS,
November 2002, <http://www.oasis-open.org/committees/
relax-ng/compact-20021121.html>.
[TCLReadme]
Rose, M., Fenner, B., and C. Levert, "xml2rfc v1.35pre1",
October 2009, <http://svn.tools.ietf.org/svn/tools/
xml2rfc/archive/README.html>.
[TLP1.0] IETF Trust, "Legal Provisions Relating to IETF Documents",
November 2008,
<http://trustee.ietf.org/license-info/IETF-TLP-1.htm>.
Reschke Informational [Page 48]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
[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>.
[TLP5.0] IETF Trust, "Legal Provisions Relating to IETF Documents",
March 2015,
<http://trustee.ietf.org/license-info/IETF-TLP-5.htm>.
[UNICODE] The Unicode Consortium, "The Unicode Standard",
<http://www.unicode.org/versions/latest/>.
[USASCII] American National Standards Institute, "Coded Character
Set -- 7-bit American Standard Code for Information
Interchange", ANSI X3.4, 1986.
[V1rev] Rose, M., "Writing I-Ds and RFCs using XML (revised)",
February 2008,
<http://svn.tools.ietf.org/svn/tools/xml2rfc/archive/
draft-mrose-writing-rfcs.html>.
[XPOINTER] Grosso, P., Maler, E., Marsh, J., and N. Walsh, "XPointer
Framework", W3C Recommendation REC-xptr-framework-
20030325, March 2003,
<http://www.w3.org/TR/2003/REC-xptr-framework-20030325/>.
Latest version available at
<http://www.w3.org/TR/xptr-framework/>.
Reschke Informational [Page 49]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Appendix A. Front-Page ("Boilerplate") Generation
A.1. The "category" Attribute
For RFCs, the "category" attribute (Section 2.33.1) determines the
"maturity level" (see Section 4 of [RFC2026]). The allowed values
are "std" for "Standards Track", "bcp" for "BCP", "info" for
"Informational", "exp" for "Experimental", and "historic" for
"Historic".
For Internet-Drafts, the "category" attribute is not needed; when
supplied, it will appear as "Intended Status". Supplying this
information can be useful to reviewers.
A.2. The "ipr" Attribute
This attribute value can take a long list of values, each of which
describes an IPR policy for the document (Section 2.33.4). The
values are not the result of a grand design, but they remain simply
for historic reasons. Of these values, only a few are currently in
use; all others are supported by 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 (Section 2.33.9) 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.
Reschke Informational [Page 50]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
A.2.1. Current Values: "*trust200902"
The name for these values refers to the IETF Trust's "Legal
Provisions Relating to IETF Documents", sometimes simply called the
"TLP", which went into effect on February 15, 2009 [TLP2.0]. Updates
to this document were published on September 12, 2009 [TLP3.0] and on
December 28, 2009 [TLP4.0], modifying the license for code components
(see <http://trustee.ietf.org/license-info/> for further
information). The actual text is located in Section 6 ("Text to Be
Included in IETF Documents") of these documents.
Formatters 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 |
+----------+--------------------------------+
The TLP was again updated in March 2015 ([TLP5.0]), but the
changes made in that version do not affect the boilerplate text.
A.2.1.1. trust200902
This value should be used 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.
Reschke Informational [Page 51]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
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" (referring to changes
introduced in [RFC5378]):
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 [TLP1.0].
Reschke Informational [Page 52]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
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 Section 5 of [RFC3978].
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 Section 5 of [RFC3667].
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 Section 10 of [RFC2026].
The special value "none" was also used back then; it denied the IETF
any rights beyond publication as an Internet-Draft.
Reschke Informational [Page 53]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
A.3. The "submissionType" Attribute
The RFC Editor publishes documents from different document streams,
of which the IETF stream is the most prominent. Other streams are
the independent stream (used for things such as discussion of
Internet-related technologies that are not part of the IETF agenda),
the IAB stream (Internet Architecture Board) and the IRTF stream
(Internet Research Task Force).
The values for the attribute are "IETF" (the default value),
"independent", "IAB", and "IRTF".
Historically, this attribute did not affect the final appearance of
RFCs, except for subtle differences in copyright notices. Nowadays
(as of [RFC5741]), the stream name appears in the first line of the
front page, and it also affects the text in the "Status of This Memo"
section.
For current documents, setting the "submissionType" attribute will
have the following effect:
o For RFCs, the stream name appears in the upper left corner of the
first page (in Internet-Drafts, this is either "Network Working
Group" or the value of the <workgroup> element).
o For RFCs, it affects the whole "Status of This Memo" section (see
Section 3.2.2 of [RFC5741]).
o For all RFCs and Internet-Drafts, it determines whether the
"Copyright Notice" mentions the copyright on Code Components (see
Section 6 of the TLP ("Text to Be Included in IETF Documents")).
Reschke Informational [Page 54]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
A.4. The "consensus" Attribute
For some of the publication streams (see Appendix A.3), the "Status
of This Memo" section depends on whether there was a consensus to
publish (again, see Section 3.2.2 of [RFC5741]).
The "consensus" attribute ("yes"/"no", defaulting to "yes") can be
used to supply this information. The effect for the various
streams is:
o "independent" and "IAB": none.
o "IETF": mention that there was an IETF consensus.
o "IRTF": mention that there was a research group consensus (where
the name of the research group is extracted from the <workgroup>
element).
Reschke Informational [Page 55]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Appendix B. Changes from RFC 2629 ("v1")
B.1. Removed Elements
The <appendix> element has been removed; to generate an appendix,
place a <section> inside <back>.
B.2. Changed Defaults
Many attributes have lost their "default" value; this is to avoid
having document semantics differ based on whether a DTD was specified
and evaluated. Processors will handle absent values the way the
default value was specified before.
Reschke Informational [Page 56]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
B.3. Changed Elements
<artwork>: Has a set of new attributes: "name", "type", "src",
"align", "alt", "width", and "height". (Section 2.5)
<author>: The <organization> element is now optional. The "role"
attribute was added. (Section 2.6)
<country>: The requirement to use ISO 3166 codes was removed.
(Section 2.11)
<date>: All attributes are now optional. (Section 2.13)
<figure>: Has a set of new attributes: "suppress-title", "src",
"align", "alt", "width", and "height". (Section 2.17)
<iref>: Has a new "primary" attribute. (Section 2.20)
<list>: The "style" attribute isn't restricted to a set of enumerated
values anymore. The "hangIndent" and "counter" attributes have been
added. (Section 2.22)
<reference>: <annotation> allows adding prose to a reference. The
"anchor" attribute has been made mandatory. (Section 2.30)
<references>: Can now appear multiple times and can carry a "title"
attribute (so that normative and informative references can be
split). (Section 2.31)
<rfc>: The "ipr" attribute has gained additional values. The
attributes "consensus", "iprExtract", "submissionType", and
"xml:lang" have been added. (Section 2.33)
<section>: The new "toc" attribute controls whether it will appear in
the Table Of Contents. <iref> can now appear as a direct child
element. (Section 2.34)
<t>: The "anchor" attribute can now be used as well; however, there
are restrictions on how they can be referred to. (Section 2.38)
B.4. New Elements
The following elements have been added: <annotation> (Section 2.3),
<c> (Section 2.8), <cref> (Section 2.12), <format> (Section 2.18),
<spanx> (Section 2.36), <texttable> (Section 2.39), and <ttcol>
(Section 2.41).
Reschke Informational [Page 57]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Appendix C. 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?
}
Reschke Informational [Page 58]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
front =
element front {
title,
author+,
date,
area*,
workgroup*,
keyword*,
abstract?,
note*
}
title =
element title {
attribute abbrev { text }?,
text
}
author =
element author {
attribute initials { text }?,
attribute surname { text }?,
attribute fullname { text }?,
attribute role { "editor" }?,
organization?,
address?
}
organization =
element organization {
attribute abbrev { text }?,
text
}
address =
element address { postal?, phone?, facsimile?, email?, uri? }
postal =
element postal { street+, (city | region | code | country)* }
street = element street { text }
city = element city { text }
region = element region { text }
code = element code { text }
Reschke Informational [Page 59]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
country = element country { text }
phone = element phone { text }
facsimile = element facsimile { text }
email = element email { text }
uri = element uri { text }
date =
element date {
attribute day { text }?,
attribute month { text }?,
attribute year { text }?,
empty
}
area = element area { text }
workgroup = element workgroup { text }
keyword = element keyword { text }
abstract = element abstract { t+ }
note =
element note {
attribute title { text },
t+
}
middle = element middle { section+ }
section =
element section {
attribute anchor { xsd:ID }?,
attribute title { text },
[ a:defaultValue = "default" ]
attribute toc { "include" | "exclude" | "default" }?,
(t | figure | texttable | iref)*,
section*
}
Reschke Informational [Page 60]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
t =
element t {
attribute anchor { xsd:ID }?,
attribute hangText { text }?,
(text
| \list
| figure
| xref
| eref
| iref
| cref
| spanx
| vspace)*
}
\list =
element list {
attribute style { text }?,
attribute hangIndent { text }?,
attribute counter { text }?,
t+
}
xref =
element xref {
attribute target { xsd:IDREF },
[ a:defaultValue = "false" ]
attribute pageno { "true" | "false" }?,
[ a:defaultValue = "default" ]
attribute format { "counter" | "title" | "none" | "default" }?,
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
}
Reschke Informational [Page 61]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
cref =
element cref {
attribute anchor { xsd:ID }?,
attribute source { text }?,
text
}
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)* }
Reschke Informational [Page 62]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
artwork =
element artwork {
[ a:defaultValue = "preserve" ]
attribute xml:space { "default" | "preserve" }?,
[ a:defaultValue = "" ] attribute name { text }?,
[ a:defaultValue = "" ] attribute type { text }?,
attribute src { text }?,
[ a:defaultValue = "left" ]
attribute align { "left" | "center" | "right" }?,
[ a:defaultValue = "" ] attribute alt { text }?,
[ a:defaultValue = "" ] attribute width { text }?,
[ a:defaultValue = "" ] attribute height { text }?,
text*
}
postamble =
element postamble { (text | xref | eref | iref | cref | spanx)* }
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" }?,
text
}
c = element c { (text | xref | eref | iref | cref | spanx)* }
back = element back { references*, section* }
Reschke Informational [Page 63]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
references =
element references {
[ a:defaultValue = "References" ] attribute title { text }?,
reference+
}
reference =
element reference {
attribute anchor { xsd:ID },
attribute target { text }?,
front,
seriesInfo*,
format*,
annotation*
}
seriesInfo =
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)* }
start = rfc
(This schema was derived from version 1.3.6 of the xml2rfc DTD
("Document Type Definition") (Section 2.8 of [XML]), available from
<http://svn.tools.ietf.org/svn/tools/xml2rfc/vocabulary/v2/03/
xml2rfcv2.dtd>.)
Reschke Informational [Page 64]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
C.1. Checking Validity
The validity of XML files can be checked with any tool that supports
RELAX NG [RNC]. The reference implementation is the Java-based,
open-sourced "Jing" [JING].
To use Jing, download the latest ZIP file from the "downloads" page
(currently <https://code.google.com/p/jing-trang/downloads/
detail?name=jing-20091111.zip>), extract the archive, copy "jing.jar"
from the "bin" folder, and make sure Java is installed.
To check a file "test.xml" using the RNC file "schema.rnc", run (from
a command-line prompt):
java -jar jing.jar -c schema.rnc test.xml
In good Unix tradition, no output means the file is valid.
Reschke Informational [Page 65]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
IAB Members at the Time of Approval
Jari Arkko (IETF Chair)
Mary Barnes
Marc Blanchet
Ralph Droms
Ted Hardie
Joe Hildebrand
Russ Housley
Erik Nordmark
Robert Sparks
Andrew Sullivan
Dave Thaler
Brian Trammell
Suzanne Woolf
Acknowledgments
Thanks to everybody who reviewed this document and provided feedback
and/or specification text, in particular Brian Carpenter, Elwyn
Davies, Tony Hansen, Joe Hildebrand, Paul Hoffman, Henrik Levkowetz,
Alice Russo, Tom Taylor, Dave Thaler, Jim Schaad, and Nico Williams.
We also thank Marshall T. Rose for both the original design and the
reference implementation of the "xml2rfc" formatter.
Reschke Informational [Page 66]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
Index
A
Attributes
abbrev 21, 34
align 7, 14, 32, 34
alt 7, 15
anchor 11, 15, 23, 28, 31-32
blankLines 35
category 25
consensus 25
counter 18
day 12
docName 25
format 36
fullname 9
hangIndent 18
hangText 31
height 7, 15
initials 9
ipr 26
iprExtract 26
item 17
month 12
name 7, 29
number 27
obsoletes 27
octets 16
pageno 37
primary 17
role 9
seriesNo 27
source 12
src 7, 15
style 19, 30, 32
subitem 17
submissionType 27
suppress-title 15, 33
surname 10
target 13, 16, 23, 37
title 15, 21, 24, 28, 33
toc 28
type 8, 16
updates 27
value 29
width 8, 15, 34
Reschke Informational [Page 67]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
xml:lang 28
xml:space 8, 30
year 13
abbrev attribute
in organization element 21
in title element 34
abstract element 4, 50
inside front 16
address element 4, 50
inside author 9
align attribute
in artwork element 7
in figure element 14
in texttable element 32
in ttcol element 34
alt attribute
in artwork element 7
in figure element 15
anchor attribute
in cref element 11
in figure element 15
in reference element 23
in section element 28
in t element 31
in texttable element 32
annotation element 5, 50
inside reference 23
application/rfc+xml Media Type 40
area element 5, 50
inside front 16
artwork element 6, 50
align attribute 7
alt attribute 7
height attribute 7
inside figure 14
name attribute 7
src attribute 7
type attribute 8
width attribute 8
xml:space attribute 8
author element 8, 50
fullname attribute 9
initials attribute 9
inside front 16
role attribute 9
surname attribute 10
Reschke Informational [Page 68]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
B
back element 10, 50
inside rfc 25
blankLines attribute
in vspace element 35
C
c element 10, 50
inside texttable 32
category attribute
in rfc element 25
city element 11, 50
inside postal 22
code element 11, 50
inside postal 22
consensus attribute
in rfc element 25
counter attribute
in list element 18
country element 11, 50
inside postal 22
cref element 11, 50
anchor attribute 11
inside annotation 5
inside c 10
inside postamble 22
inside preamble 23
inside t 31
source attribute 12
D
date element 12, 50
day attribute 12
inside front 16
month attribute 12
year attribute 13
day attribute
in date element 12
docName attribute
in rfc element 25
E
Elements
abstract 4, 16
address 4, 9
annotation 5, 23
area 5, 16
artwork 6, 14
author 8, 16
back 10, 25
c 10, 32
Reschke Informational [Page 69]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
city 11, 22
code 11, 22
country 11, 22
cref 5, 10-11, 22-23, 31
date 12, 16
email 5, 13
eref 5, 10, 13, 22-23, 31
facsimile 5, 14
figure 14, 28, 31
format 15, 23
front 16, 23, 25
iref 5, 10, 14, 17, 22-23, 28, 31
keyword 16, 18
list 18, 31
middle 20, 25
note 17, 20
organization 9, 21
phone 5, 21
postal 5, 21
postamble 14, 22, 32
preamble 14, 22, 32
reference 23-24
references 10, 24
region 22, 24
rfc 24
section 10, 20, 28
seriesInfo 23, 29
spanx 5, 10, 22-23, 29, 31
street 21, 30
t 4, 18, 20, 28, 31
texttable 28, 31
title 16, 33
ttcol 32, 34
uri 5, 34
vspace 31, 34
workgroup 16, 35
xref 5, 10, 22, 31, 35
email element 13, 50
inside address 5
eref element 13, 50
inside annotation 5
inside c 10
inside postamble 22
inside preamble 23
inside t 31
target attribute 13
Reschke Informational [Page 70]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
F
facsimile element 14, 50
inside address 5
figure element 14, 50
align attribute 14
alt attribute 15
anchor attribute 15
height attribute 15
inside section 28
inside t 31
src attribute 15
suppress-title attribute 15
title attribute 15
width attribute 15
format attribute
in xref element 36
format element 15, 50
inside reference 23
octets attribute 16
target attribute 16
type attribute 16
front element 16, 50
inside reference 23
inside rfc 25
fullname attribute
in author element 9
H
hangIndent attribute
in list element 18
hangText attribute
in t element 31
height attribute
in artwork element 7
in figure element 15
I
initials attribute
in author element 9
ipr attribute
"*2026" 48
"*3667" 48
"*3978" 47
"*trust200811" 47
"*trust200902" 46
"noDerivativesTrust200902" 47
"noModificationTrust200902" 46
"pre5378Trust200902" 47
"trust200902" 46
in rfc element 26
Reschke Informational [Page 71]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
iprExtract attribute
in rfc element 26
iref element 17, 50
inside annotation 5
inside c 10
inside figure 14
inside postamble 22
inside preamble 23
inside section 28
inside t 31
item attribute 17
primary attribute 17
subitem attribute 17
item attribute
in iref element 17
K
keyword element 18, 50
inside front 16
L
list element 18, 50
counter attribute 18
hangIndent attribute 18
inside t 31
style attribute 19
list styles
empty 19
format ... 20
hanging 19
letters 19
numbers 19
symbols 19
M
Media Type
application/rfc+xml 40
middle element 20, 50
inside rfc 25
month attribute
in date element 12
N
name attribute
in artwork element 7
in seriesInfo element 29
note element 20, 50
inside front 17
title attribute 21
number attribute
in rfc element 27
Reschke Informational [Page 72]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
O
obsoletes attribute
in rfc element 27
octets attribute
in format element 16
organization element 21, 50
abbrev attribute 21
inside author 9
P
pageno attribute
in xref element 37
phone element 21, 50
inside address 5
postal element 21, 50
inside address 5
postamble element 22, 50
inside figure 14
inside texttable 32
preamble element 22, 50
inside figure 14
inside texttable 32
primary attribute
in iref element 17
R
reference element 23, 50
anchor attribute 23
inside references 24
target attribute 23
references element 24, 50
inside back 10
title attribute 24
region element 24, 50
inside postal 22
rfc element 24, 50
category attribute 25
consensus attribute 25
docName attribute 25
ipr attribute 26
iprExtract attribute 26
number attribute 27
obsoletes attribute 27
seriesNo attribute 27
submissionType attribute 27
updates attribute 27
xml:lang attribute 28
role attribute
in author element 9
Reschke Informational [Page 73]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
S
section element 28, 50
anchor attribute 28
inside back 10
inside middle 20
inside section 28
title attribute 28
toc attribute 28
seriesInfo element 29, 50
inside reference 23
name attribute 29
value attribute 29
seriesNo attribute
in rfc element 27
source attribute
in cref element 12
spanx element 29, 50
inside annotation 5
inside c 10
inside postamble 22
inside preamble 23
inside t 31
style attribute 30
xml:space attribute 30
src attribute
in artwork element 7
in figure element 15
street element 30, 50
inside postal 21
style attribute
in list element 19
in spanx element 30
in texttable element 32
subitem attribute
in iref element 17
submissionType attribute
in rfc element 27
suppress-title attribute
in figure element 15
in texttable element 33
surname attribute
in author element 10
Reschke Informational [Page 74]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
T
t element 31, 50
anchor attribute 31
hangText attribute 31
inside abstract 4
inside list 18
inside note 20
inside section 28
target attribute
in eref element 13
in format element 16
in reference element 23
in xref element 37
texttable element 31, 50
align attribute 32
anchor attribute 32
inside section 28
style attribute 32
suppress-title attribute 33
title attribute 33
title attribute
in figure element 15
in note element 21
in references element 24
in section element 28
in texttable element 33
title element 33, 50
abbrev attribute 34
inside front 16
toc attribute
in section element 28
ttcol element 34, 50
align attribute 34
inside texttable 32
width attribute 34
type attribute
in artwork element 8
in format element 16
U
updates attribute
in rfc element 27
uri element 34, 50
inside address 5
Reschke Informational [Page 75]
RFC 7749 The "xml2rfc" Version 2 Vocabulary February 2016
V
value attribute
in seriesInfo element 29
vspace element 34, 50
blankLines attribute 35
inside t 31
W
width attribute
in artwork element 8
in figure element 15
in ttcol element 34
workgroup element 35, 50
inside front 16
X
xml:lang attribute
in rfc element 28
xml:space attribute
in artwork element 8
in spanx element 30
xref element 35, 50
format attribute 36
inside annotation 5
inside c 10
inside postamble 22
inside preamble 22
inside t 31
pageno attribute 37
target attribute 37
xref formats
counter 36
default 36
none 36
title 36
Y
year attribute
in date element 13
Author's Address
Julian F. Reschke
greenbytes GmbH
Hafenweg 16
Muenster, NW 48155
Germany
Email: julian.reschke@greenbytes.de
URI: http://greenbytes.de/tech/webdav/
Reschke Informational [Page 76]