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draft-iab-svg-rfc-02.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE rfc SYSTEM "rfc2629.dtd" [
<!ENTITY rfc2119 PUBLIC ''
'http://xml.resource.org/public/rfc/bibxml/reference.RFC.2119.xml'>
]>
<rfc category="info" ipr="trust200902"
docName="draft-iab-svg-rfc-02">
<?xml-stylesheet type='text/xsl' href='rfc2629.xslt' ?>
<?rfc iprnotified="no" ?>
<?rfc toc="yes"?>
<?rfc tocdepth="4"?>
<?rfc symrefs="yes" ?>
<?rfc sortrefs="no" ?>
<front>
<title>SVG Drawings for RFCs: SVG 1.2 RFC</title>
<author initials="N." surname="Brownlee" fullname="Nevil Brownlee">
<organization>The University of Auckland</organization>
<address><email>[email protected]</email></address>
</author>
<author surname="IAB" fullname="Internet Architecture Board">
<organization></organization>
<address><email>[email protected]</email>
</address>
</author>
<date day="26" month="February" year="2016" />
<keyword>RFC</keyword>
<abstract>
<t>. Maybe the text in section
This document specifies SVG 1.2 RFC - an SVG profile for use in diagrams
that may appear in RFCs - and considers some of the issues
concerning the creation and use of such diagrams.
</t>
</abstract>
</front>
<middle>
<section title="Introduction">
<t>
Over the last few years the RFC Editor has worked with the
Internet community to develop specifications for changes in
the format of RFCs. An outline of the resulting
specifications was published as <xref target="RFC6949"/> in May 2013.
Since then a Design Team has been working with the RFC Editor
to flesh out those specifications.
One aspect of the changes is to allow line drawings in RFCs;
<xref target="RFC6949"/> says
<list style="empty"><t>
"Graphics may include ASCII art and a more complex form to be
defined, such as SVG line art [SVG]. Color and grayscale will
not be accepted. RFCs must correctly display in monochromatic
black-and-white to allow for monochrome displays,
black-and-white printing, and support for visual disabilities."
</t></list>
</t><t>
SVG (Scalable Vector Graphics) has been developed by W3C, the
World Wide Web Consortium; its current standard is SVG 1.1 Full
<xref target="W3C.REC-SVG11-20110816"/>.
This document defines SVG 1.2 RFC, an SVG profile (i.e. a subset
of SVG) that is suitable for RFC line drawings.
</t><t>
Note that in RFCs, the text provides normative
descriptions of protocols, systems, etc. Diagrams may be
used to help explain concepts more clearly, but
they provide supporting detail, and should not be considered
to be complete specifications in themselves.
<!-- they are informative, not normative. -->
</t><t>
The details (particularly any vocabularies) described in this
document are expected to change based on experience gained in
implementing the RFC production center's toolset. Revised
documents will be published capturing those changes as the
toolset is completed. Other implementors must not expect those
changes to remain backwards-compatible with the details
described in this document.
</t>
</section>
<section title="SVG 1.2 RFC: An SVG profile for RFCs">
<t>
As a starting point for SVG 1.2 RFC, the Design Team decided to
use SVG 1.2 Tiny <xref target="W3C.REC-SVGTiny12-20081222"/>.
SVG 1.2 Tiny is an SVG subset intended to be implemented on
small, mobile devices such as cellphones and smartphones.
That should allow RFCs to be rendered well on such devices,
especially those that have small screens. However, RFCs are
self-contained documents that do not change once they are
published. The use of SVG drawings in RFCs is intended to allow
authors to create drawings that are simple to produce, and
easier to understand than our traditional 'ASCII Art' ones.
In short, we are also trying to improve access to the content in
RFCs, so SVG drawings need to be kept as simple as possible.
</t><t>
Appendix A (below) provides a complete RELAX NG Compact (rnc) schema
for SVG 1.2 RFC. It is derived from the SVG 1.2 schema, and is
the formal definition of SVG 1.2 RFC. The remainder of this section
gives a simplified - i.e. easier to read and dunderstand -
overview of SVG 1.2 RFC.
</t><t>
SVG can provide a complete User Interface, but within RFCs, all
we need are simple diagrams that do not change once the RFC is
published. Therefore, SVG RFC does not allow anything from the
following sections in SVG Tiny 1.2
<xref target="W3C.REC-SVGTiny12-20081222"/>:
<?rfc subcompact="yes" ?>
<list style='hanging'>
<t hangText="12 Multimedia"></t>
<t hangText="13 Interactivity"></t>
<t hangText="15 Scripting"></t>
<t hangText="16 Animation"></t>
<t hangText="18 Metadata"></t>
<t hangText="19 Extensibility"></t>
</list>
Note that SVG Tiny 1.2 elements may have many properties or
attributes that are needed to support aspects of the above sections.
Those are not allowed in SVG 1.2 RFC.
</t><t>
Considering the other sections in SVG Tiny 1.2
<xref target="W3C.REC-SVGTiny12-20081222"/>:
<list style='hanging' hangIndent='5'>
<t hangText=" 9 Basic Shapes"></t>
<t hangText="10 Text"><vspace />
Everything in these sections is allowed in SVG 1.2 RFC.
</t>
<?rfc subcompact="no" ?>
<t hangText="11 Painting: Filling, Stroking, Colors and Paint Servers">
<vspace />
Anything relating to 'color' is not allowed in SVG 1.2 RFC,
everything else is allowed. This is a requirement documented
in <xref target="RFC6949"/>.
</t>
<t hangText="14 Linking"><vspace />
SVG Tiny 1.2 allows internationalized IRIs in references.
In SVG 1.2 RFC such links must be ASCII only. That should
not cause problems, since one can just use the URI form of
any IRI. Authors should try to use links only to URIs
that are long-term stable.<vspace />
</t>
<t hangText="17 Fonts"><vspace />
SVG 1.2 RFC only allows 'serif', 'sans-serif' and 'monospace'
generic font families from the WebFonts facility, described
in CSS 2.1, <xref target= "W3C.REC-CSS2-20110607"/>,
section 15,
Fonts. In particular, the SVG 'font' element is not allowed.
</t>
</list>
</t>
<section title="Elements, properties and attributes allowed in SVG 1.2 RFC">
<t> Elements, properties and attributes selected for SVG 1.2 RFC
from <xref target="W3C.REC-SVGTiny12-20081222"/>.
<figure><artwork><![CDATA[
In the list below, elements and properties are listed on the
left,and their allowed values are given in parentheses on the
right.
<color> is the list of allowed colors, a black-and-white
subset of the SVG color names.
<style> is a set of CSS attributes that are commonly used (by SVG
drawing applications). They are not part of SVG Tiny 1.2,
but are included here for compatibility. Note that
- There is no guarantee that any renderer will implement
all the CSS attributes a drawing application may use.
- Authors will need to consider the compatibility of their
drawings with rendering devices.
Elements:
svg (version=1.2, baseProfile=tiny, width, viewBox,
preserveAspectRatio, snapshotTime, height,
id, role)
g (label, class, id, role, fill, <style>, transform)
defs (id, role, fill)
title (id, role)
desc (id, role)
a (id, role, fill, transform)
use (x, y, href, xlink:href, id, role, fill, transform)
rect (x, y, width, height, rx, ry, stroke-miterlimit
id, role, fill, <style>, transform)
circle (cx, cy, r,
id, role, fill, <style>, transform)
ellipse (cx, cy, rx, ry,
id, role, fill, <style>, transform)
line (x1, y1, x2, y2, id, role, fill, transform)
polyline (points, id, role, fill, transform)
polygon (points, id, role, fill, <style>, transform)
text (x, y, rotate, space, id, role, fill, <style>,
transform)
tspan (x, y, id, role, fill)
textArea (x, y, width, height, auto, id, role, fill,
transform)
tbreak (id, role)
solidColor (id, role, fill)
linearGradient (gradientUnits, x1, y1, x2, y2, id, role, fill)
radialGradient (gradientUnits, cx, cy, r, id, role, fill)
stop (id, role, fill)
path (d, pathLength, stroke-miterlimit,
id, role, fill, <style>, transform)
Properties: (most allow inherit as a value)
<style> (font-family, font-weight, font-style,
font-variant, direction, unicode-bidi,
text-anchor, fill, fill-rule)
<color> (black, white, #000000, #ffffff, #FFFFFF)
stroke (<color>, none, currentColor)
stroke-width
stroke-linecap (butt, round, square)
stroke-linejoin (miter, round, bevel)
stroke-mitrelimit
stroke-dasharray
stroke-dashoffset
stroke-opacity
vector-effect (non-scaling-stroke, none)
viewport-fill (none, currentColor)
viewport-fill-opacity
display (inline, block, list-item, run-in, compact,
marker, table, inline-table, table-row-group,
table-header-group, table-footer-group,
table-row, table-column-group,
table-column, table-cell, table-caption,
none)
visibility (visible, hidden, collapse)
color-rendering (auto, optimizeSpeed, optimizeQuality)
shape-rendering (auto, optimizeSpeed, crispEdges,
geometricPrecision)
text-rendering (auto, optimizeSpeed, optimizeLegibility,
geometricPrecision)
buffered-rendering (auto, dynamic, static)
opacity
solid-opacity
solid-color (currentColor, <color>)
color (currentColor, <color>)
stop-color (currentColor, <color>)
stop-opacity
line-increment (auto)
text-align (start,end, center)
display-align (auto, before, center, after)
font-size
font-family (serif, sans-serif, monospace)
font-weight (normal, bold, bolder, lighter)
font-style (normal, italic, oblique)
font-variant (normal, small-caps)
direction (ltr, rtl)
unicode-bidi (normal, embed, bidi-override)
text-anchor (start, middle, end)
fill (none, <color>)
fill-rule (nonzero, evenodd)
fill-opacity
]]></artwork></figure>
</t>
</section>
</section>
<section title="How to create SVG drawings">
<t>Many drawing packages can be used to create SVG drawings,
for example Open Source packages Inkscape and Dia.
Be aware that such packages may use SVG elements or attributes
that are not allowed in SVG 1.2 RFC.
<list style="symbols">
<t>For example, the 'marker' attribute is often used to place
symbols such as arrowheads on lines, but 'marker' is not allowed
in SVG 1.2 Tiny or SVG 1.2 RFC. In such cases one has to draw
the arrowhead in another, simpler way.</t>
<t>SVG clip paths are used to define a shape; objects outside
that shape become invisible. The 'clipPath' element is not
allowed in SVG 1.2 Tiny or SVG 1.2 RFC.</t>
</list>
</t><t>
Diagrams produced with these packages may contain elements,
their attributes or properties, or values of attributes or
properties that are not allowed in SVG 1.2 RFC.
We will need to provide a tool to strip out anything that is not
allowed in SVG 1.2 RFC, or to replace disallowed values,
e.g., 'sans-serif' for 'Sans' as values for 'font-family'.
Experience with a simple test version of a tool for this has shown
that such deletion and replacement can be effective for
making SVG files from drawing packages conform to SVG 1.2 RFC,
without visibly changing the diagrams they produce.
</t><t>
The tool described above can also be used by Authors simply
to check that their diagrams conform to SVG 1.2 RFC. To help
with this, if visible changes do occur, the tool should
produce a list of non-allowed keywords and the context in which
they were found.
</t><t>
To include a diagram into an RFC, the xml2rfc (v3) tool will
need to provide a way to include SVG drawings in Internet
Drafts, as described in <xref target='XML2RFCv3' /> sections
2.5 and 2.67.
</t>
</section>
<section title="Accessibility Considerations">
<t>One of the long-term goals for RFCs is to make them more
accessible, e.g. to sight-impaired readers. For diagrams,
it would be useful for authors to provide alternative forms
of the diagram, so that voice-reading software could be used
to 'talk through' the diagram. Simply reading the SVG code
for a complex diagram seems unlikely to work.
</t><t>
SVG 1.2 RFC allows SVG's 'title' and 'desc' elements.
'title' provides a brief text caption for an SVG object
(much like a figure caption), and 'desc' provides a longer
text description of what the object actually represents.
As well, the SVG 'role' attribute can be used to indicate
to a browser how an SVG object is to be interpreted.
Good suggestions on how to use these elements are given in
<xref target='SVG-ACCESS-TIPS' />.
</t><t>
ARIA is a W3C Recommendation for using SVG to create
'Accessible Rich Internet Applications.' A helpful introduction
to ARIA is provided by <xref target='SVG-ARIA-PRIMER' />,
while <xref target='SVG-USING-ARIA' /> gives examples of how
to use ARIA to enhance SVG accessibility.
</t>
</section>
<section title="Examples of diagrams common in RFCs">
<t>
Another way to create SVG drawings is to write programs to draw
them. For example, using python and its svgwrite module is
a pleasant environment (for those who like writing code);
this section presents a few examples of diagrams created in this
way. Note that they are merely examples of typical diagrams from
RFCs.
</t><t>The SVG diagrams for this section can be seen at
<xref target='This-I-D-with-SVG-included' />
along with an html version of this draft that includes the SVG
diagrams.
</t>
<section title="Packet Layout Diagrams">
<t>Example: Figure 3 from <xref target='RFC0793' />.</t>
</section>
<section title="Sequence Diagrams (1)">
<t>Example: Figure 6 from <xref target='ExpTrustedProxy' />.</t>
</section>
<section title="Sequence Diagrams (2)">
<t>Example: Figure 3 from <xref target='RFC4321' />.</t>
</section>
</section>
<section title="IANA Considerations">
<t>
This document does not create a new registry nor does it register any
values in existing registries; no IANA action is required.
</t>
</section>
<section title="Acknowledgements">
<t>
Thanks to the RSE and the Design Team members for their helpful comments
and suggestions for SVG 1.2 RFC, as well as from the wider IETF community.
</t>
</section>
<section title="Revision History [RFC Editor please delete]">
<t><list style="hanging" hangIndent="3">
<t hangText="version -02, 25 Feb 16:">
<vspace/>Changed the example metalanguage by removing the metalanguage
code. The svg diagrams remain, as examples of diagrams that have
appeared in earlier RFCs.
</t>
<t hangText="version -01, 26 Jan 16:">
<vspace/>rnc schema changed to use Joe Hildebrand's version,
github: "rename title element *reference* to svgTitle, in order
to allow combination with XML2RFC schema. Note: XML element
name does not change."
</t>
<t hangText="version -00, 6 Jan 16:">
<vspace/>Now an IAB draft, changed name to draft-iab-svg-rfc-00.
</t>
<t hangText="version -13, 16 Oct 15:">
<vspace/>Added Informative Reference to XML2RFC v3 draft on
'how to include SVG diagrams'.
<vspace />Added Informative Reference to Nevil's home page for a
version of this I-D with its SVG diagrams included.
<vspace/>Added Informative References to RFC0793 and I-Ds for the
example diagrams.
<vspace/>Changed 'colour' to 'color' so as to be consistent.
<vspace/>Fixed other typos (thanks to Dave Thaler for all these)!
<vspace/>Removed 'grey' color from example diagrams.
</t>
<t hangText="version -12, 24 Sep 15:">
<vspace/>Appendix A added: a complete relax-ng compact (rnc)
schema for SVG-1.2-RFC.
<vspace/>Section 2.1: Elements/attributes/properties table
updated to match the schema in Appendix A.
</t>
<t hangText="version -11, 17 Aug 15:">
<vspace/>Section 1: Fixed typo in "Details are expected to
change" paragraph.
</t>
<t hangText="version -10, 14 Aug 15:">
<vspace/>Section 1: Added "Details are expected to change" paragraph.
</t>
<t hangText="version -09, 31 Mar 15:">
<vspace/>No changes, version number incremented to
keep draft alive
</t>
<t hangText="version -08, 29 Sep 14:">
<vspace/>Section 1: Changed comment about diagrams 'not
being normative' to 'not complete specifications in
themselves.
<vspace/>Section 2.1: Added SVG 1.2 Tiny 'id' attribute
because most drawing packages use it in constructing
drawings.
<vspace/>Section 2.1: Added SVG 1.2 Tiny 'role' attribute
so that ARIA can use it.
<vspace/>Section 3: added comment about changes to xml2rfc
required to include SVG diagrams.
<vspace/>Section 4: Added reference to svg-aria-primer.
</t>
<t hangText="version -07, 3 Jul 14:">
<vspace/>Expanded text about Accessibility in
'how to create SVG drawings' section into 'Accessibility
Considerations section. Added two SVG Accessibility
references to support that.</t>
<t hangText="version -06, 26 Jun 14:">
<vspace/>Remove trailing / from URL in section 4; the html
version on tools.ietf.org/html assumed the next word was
part of that URL.</t>
<t hangText="version -05, 25 Jun 14:">
<vspace/>Improved section on 'how to create SVG drawings'
By adding some text about which elements aren't allowed
in SVG 1.2 RFC.
<vspace/>Added more text describing the tool for checking,
stripping out or replacing incompatible elements and attributes
from an SVG file.
</t>
<t hangText="version -04, 30 Apr 14:">
<vspace/>Fixed typos, used full references for two of the
w3c refs - each had an author name using UTF8 characters.
<vspace/>Moved the Elements and Attributes appendix up earlier
to make it sub-section 2.1.
<vspace/>Disclaimer added to the Meta-languages section.
</t>
<t hangText="version -03, 14 Apr 14:">
<vspace/>Added two more example diagrams; a simple packet
layout, and a diagram that uses lots of diagonal lines.</t>
<t hangText="version -02, 12 Feb 14:">
<vspace/>Added metalanguage example to make time-sequence
drawings.</t>
<t hangText="version -01, 11 Feb 14:">
<vspace/>Allow links to 'long-term stable URIs'
<vspace/>Link URIs must be ASCII only
<vspace/>Need for tools to check SVG 1.2 RFC compatibility
and to strip 'unnecessary' attributes explicitly stated.
<vspace/>Statement that drawings can't be normative removed;
Postscript-only RFCs already exist.
<vspace/>Added most attributes and elements to
the Appendix.</t>
<t hangText="version -00, 29 Jan 14:">
<vspace/>Initial version, using content from Nevil's
<vspace/>emails to the Design Team.</t>
</list></t>
</section>
</middle>
<back>
<references title='Normative References'>
<?rfc include="reference.RFC.6949"?> <!-- RFC Series Format Requirements -->
<!-- include="reference.W3C.REC-SVGTiny12-20081222.xml"?> -->
<reference anchor='W3C.REC-SVGTiny12-20081222'
target='http://www.w3.org/TR/2008/REC-SVGTiny12-20081222'>
<front>
<title>Scalable Vector Graphics (SVG) Tiny 1.2 Specification</title>
<author initials='O.' surname='Andersson' fullname='Ola Andersson' />
<author initials='R.' surname='Berjon' fullname='Robin Berjon' />
<!-- <author initials='E.' surname='Dahlström'
fullname='Erik Dahlström' /> trom, dierassis over o -->
<author initials='E.' surname='Dahlstrom' fullname='Erik Dahlstrom' />
<author initials='A.' surname='Emmons' fullname='Andrew Emmons' />
<author initials='J.' surname='Ferraiolo' fullname='Jon Ferraiolo' />
<author initials='A.' surname='Grasso' fullname='Anthony Grasso' />
<author initials='V.' surname='Hardy' fullname='Vincent Hardy' />
<author initials='S.' surname='Hayman' fullname='Scott Hayman' />
<author initials='D.' surname='Jackson' fullname='Dean Jackson' />
<author initials='C.' surname='Lilley' fullname='Chris Lilley' />
<author initials='C.' surname='McCormack' fullname='Cameron McCormack' />
<author initials='A.' surname='Neumann' fullname='Andreas Neumann' />
<author initials='C.' surname='Northway' fullname='Craig Northway' />
<author initials='A.' surname='Quint' fullname='Antoine Quint' />
<author initials='N.' surname='Ramani' fullname='Nandini Ramani' />
<author initials='D.' surname='Schepers' fullname='Doug Schepers' />
<author initials='A.' surname='Shellshear' fullname='Andrew Shellshear' />
<date month='December' day='22' year='2008' />
</front>
<seriesInfo name='World Wide Web Consortium Recommendation'
value='REC-SVGTiny12-20081222' />
<format type='HTML'
target='http://www.w3.org/TR/2008/REC-SVGTiny12-20081222' />
</reference>
<!-- include="reference.W3C.REC-CSS2-20110607.xml"?> -->
<reference anchor='W3C.REC-CSS2-20110607'
target='http://www.w3.org/TR/2011/REC-CSS2-20110607'>
<front>
<title>Cascading Style Sheets Level 2 Revision 1
(CSS 2.1) Specification</title>
<author initials='B.' surname='Bos' fullname='Bert Bos' />
<!-- Celik spells his name starting with a tilde under C
<author initials='T.' surname='Ãelik'
fullname='Tantek Ãelik'> -->
<author initials='T.' surname='Celik' fullname='Tantek Celik' />
<author initials='I.' surname='Hickson' fullname='Ian Hickson' />
<author initials='H.' surname='Lie' fullname='HÃ¥kon Wium Lie' />
<date month='June' day='7' year='2011' />
</front>
<seriesInfo name='World Wide Web Consortium Recommendation'
value='REC-CSS2-20110607' />
<format type='HTML'
target='http://www.w3.org/TR/2011/REC-CSS2-20110607' />
</reference>
</references>
<references title='Informative References'>
<!-- include="reference.W3C.REC-SVG11-20110816.xml"?> -->
<reference anchor='W3C.REC-SVG11-20110816'
target='http://www.w3.org/TR/2011/REC-SVG11-20110816'>
<front>
<title>Scalable Vector Graphics (SVG) 1.1 (Second Edition)</title>
<!-- <author initials='E.' surname='Dahlström' fullname='Erik Dahlström'> -->
<author initials='E.' surname='Dahlstrom' fullname='Erik Dahlstrom' />
<author initials='P.' surname='Dengler' fullname='Patrick Dengler' />
<author initials='A.' surname='Grasso' fullname='Anthony Grasso' />
<author initials='C.' surname='Lilley' fullname='Chris Lilley' />
<author initials='C.' surname='McCormack' fullname='Cameron McCormack' />
<author initials='D.' surname='Schepers' fullname='Doug Schepers' />
<author initials='J.' surname='Watt' fullname='Jonathan Watt' />
<author initials='J.' surname='Ferraiolo' fullname='Jon Ferraiolo' />
<author initials='J.' surname='Fujisawa' fullname='Jun Fujisawa' />
<author initials='D.' surname='Jackson' fullname='Dean Jackson' />
<date month='August' day='16' year='2011' />
</front>
<seriesInfo name='World Wide Web Consortium Recommendation'
value='REC-SVG11-20110816' />
<format type='HTML' target='http://www.w3.org/TR/2011/REC-SVG11-20110816' />
</reference>
<reference anchor='SVG-ACCESS-TIPS'
target='http://www.sitepoint.com/tips-accessible-svg'>
<front>
<title>Tips for Creating Accessible SVG</title>
<author initials='L.' surname='Watson' fullname='Leonie Watson' />
<date month='May' day='6' year='2014' />
</front>
<seriesInfo name='SitePoint' value='tips-accessible-svg' />
<format type='HTML'
target='http://www.sitepoint.com' />
</reference>
<reference anchor='SVG-ARIA-PRIMER'
target='http://www.w3.org/TR/2010/WD-wai-aria-primer-20100916'>
<front>
<title>WAI-ARIA 1.0 Primer</title>
<author initials='L.' surname='Pappas' fullname='Lisa Pappas' />
<author initials='R.' surname='Schwerdtfeger' fullname='Richard Schwerdtfeger' />
<author initials='M.' surname='Cooper' fullname='Michael Cooper' />
<date month='September' day='16' year='2010' />
</front>
<seriesInfo name='World Wide Web Consortium WD'
value='WD-wai-aria-primer-20100916' />
<format type='HTML'
target='http://www.w3.org/TR/2010/WD-wai-aria-primer-20100916' />
</reference>
<reference anchor='SVG-USING-ARIA'
target=
'http://blog.paciellogroup.com/2013/12/using-aria-enhance-svg-accessibility'>
<front>
<title>Using ARIA to enhance SVG accessibility</title>
<author initials='L.' surname='Watson' fullname='Leonie Watson' />
<date month='December' day='19' year='2013' />
</front>
<seriesInfo name='The Paciello Group'
value='2013/12/using-aria-enhance-svg-accessibility' />
<format type='HTML'
target='http://blog.paciellogroup.com' />
</reference>
<reference anchor='XML2RFCv3'>
<front>
<title>The "xml2rfc" version 3 Vocabulary</title>
<author initials="P." surname="Hoffman" fullname="Paul Hoffman"/>
<date month="February" year="2016"/>
</front>
<seriesInfo name="Internet-Draft" value="draft-iab-xml2rfc-03"/>
</reference>
<reference anchor='This-I-D-with-SVG-included'>
<front>
<title>Example html version of this I-D with its SVG diagrams included
</title>
<author initials='N' surname='Brownlee' fullname='Nevil Brownlee'>
<organization />
</author>
<date month='October 16' year='2015' />
</front>
<seriesInfo name="Nevil's home page,"
value='https://www.cs.auckland.ac.nz/~nevil/SVG_RFC_1.2'/>
</reference>
<?rfc include="reference.RFC.0793"?> <!-- TCP header layout -->
<reference anchor='ExpTrustedProxy'>
<front>
<title>Explicit Trusted Proxy in HTTP/2.0</title>
<author initials='S' surname='Loretto'> <organization /> </author>
<author initials='J' surname='Mattson'> <organization /> </author>
<author initials='R' surname='Skog'> <organization /> </author>
<author initials='H' surname='Spaak'> <organization /> </author>
<author initials='G' surname='Gus'> <organization /> </author>
<author initials='D' surname='Druta'> <organization /> </author>
<author initials='M' surname='Hafeez'> <organization /> </author>
<date month='February' year='2014' />
</front>
<seriesInfo name='Internet Draft'
value='draft-loreto-httpbis-trusted-proxy20-01'/>
</reference>
<?rfc include="reference.RFC.4321"?> <!-- SIP problems -->
</references>
<section title="RELAX NG Compact (rnc) Schema for SVG 1.2 RFC">
<t> The following rnc schema can be used to check whether
an svg file conforms to SVG 1.2 RFC. For example, if this schema
were contained in a file called SVG-1.2-RFC.rnc, the following command
will test whether svg file diagram.svg is a conformant SVG 1.2 RFC
drawing.
</t><t>
jing -c SVG-1.2-RFC.rnc diagram.svg
</t>
<figure><artwork><![CDATA[
#--- SVG 1.2 RFC rnc schema; Nevil Brownlee, Fri 26 Feb 2016 (NZDT)
default namespace = "http://www.w3.org/2000/svg"
namespace ns1 = "http://www.w3.org/1999/xlink"
rfc-color = ( # SVG-1.2-RFC doesn't allow "color or grey-scale"
"black" | "white" | "#000000" | "#FFFFFF" | "#ffffff" | "inherit" )
start = svg
svg =
element svg {
((attribute fill-opacity { "inherit" | xsd:string }?,
attribute stroke-opacity { "inherit" | xsd:string }?)
& (attribute fill { "none" | rfc-color }?,
attribute fill-rule { "inherit" | "nonzero" | "evenodd" }?,
attribute stroke { rfc-color }?,
attribute stroke-dasharray { "inherit" | "none" | xsd:string }?,
attribute stroke-dashoffset { "inherit" | xsd:string }?,
attribute stroke-linecap {
"butt" | "round" | "square" | "inherit"
}?,
attribute stroke-linejoin {
"miter" | "round" | "bevel" | "inherit"
}?,
attribute stroke-miterlimit { "inherit" | xsd:string }?,
attribute stroke-width { "inherit" | xsd:string }?,
attribute color { rfc-color }?,
attribute color-rendering {
"auto" | "optimizeSpeed" | "optimizeQuality" | "inherit"
}?)
& attribute vector-effect {
"none" | "non-scaling-stroke" | "inherit"
}?
& (attribute direction { "ltr" | "rtl" | "inherit" }?,
attribute unicode-bidi {
"normal" | "embed" | "bidi-override" | "inherit"
}?)
& (attribute solid-color { rfc-color }?,
attribute solid-opacity { "inherit" | xsd:string }?)
& (attribute display-align {
"auto" | "before" | "center" | "after" | "inherit"
}?,
attribute line-increment { "auto" | "inherit" | xsd:string }?)
& (attribute stop-color { rfc-color }?,
attribute stop-opacity { "inherit" | xsd:string }?)
& (attribute font-family { "inherit" | xsd:string }?,
attribute font-size { "inherit" | xsd:string }?,
attribute font-style {
"normal" | "italic" | "oblique" | "inherit"
}?,
attribute font-variant { "normal" | "small-caps" | "inherit" }?,
attribute font-weight {
"normal"
| "bold"
| "bolder"
| "lighter"
}?,
attribute text-anchor {
"start" | "middle" | "end" | "inherit"
}?,
attribute text-align {
"start" | "center" | "end" | "inherit"
}?)),
(attribute id { xsd:NCName }
| attribute xml:id { xsd:NCName })?,
attribute xml:base { xsd:anyURI | xsd:string }?,
attribute xml:lang { xsd:language? }?,
attribute class { xsd:NMTOKENS }?,
attribute role { xsd:string }?,
attribute rel { xsd:string }?,
attribute rev { xsd:string }?,
attribute typeof { xsd:string }?,
attribute content { xsd:string }?,
attribute datatype { xsd:string }?,
attribute resource { xsd:string }?,
attribute about { xsd:string }?,
attribute property { xsd:string }?,
attribute xml:space { "default" | "preserve" }?,
attribute width { xsd:string }?,
attribute height { xsd:string }?,
attribute preserveAspectRatio {
xsd:string { pattern = "\s*(none|xMidYMid)\s*(meet)?\s*" }
}?,
attribute viewBox { text }?,
attribute zoomAndPan { "disable" }?,
attribute version {
xsd:string "1.2"
}?,
attribute baseProfile {
xsd:string "tiny"
}?,
attribute contentScriptType { xsd:string }?,
attribute snapshotTime { xsd:string "none" | xsd:string }?,
attribute timelineBegin {
xsd:string "onLoad" | xsd:string "onStart"
}?,
attribute playbackOrder {
xsd:string "all" | xsd:string "forwardOnly"
}?,
(desc
| svgTitle
| path
| rect
| circle
| line
| ellipse
| polyline
| polygon
| solidColor
| textArea
| linearGradient
| radialGradient
| \text
| g
| defs
| use
| a)*
}
desc =
element desc {
(attribute id { xsd:NCName }
| attribute xml:id { xsd:NCName })?,
attribute xml:base { xsd:anyURI | xsd:string }?,
attribute xml:lang { xsd:language? }?,
attribute class { xsd:NMTOKENS }?,
attribute role { xsd:string }?,
attribute rel { xsd:string }?,
attribute rev { xsd:string }?,
attribute typeof { xsd:string }?,
attribute content { xsd:string }?,
attribute datatype { xsd:string }?,
attribute resource { xsd:string }?,
attribute about { xsd:string }?,
attribute property { xsd:string }?,
attribute xml:space { "default" | "preserve" }?,
attribute requiredFeatures { xsd:string }?,
attribute requiredExtensions { xsd:string }?,
attribute requiredFormats { xsd:string }?,
attribute requiredFonts { xsd:string }?,
attribute systemLanguage { xsd:string }?,
((attribute display {
"inline"
| "block"
| "list-item"
| "run-in"
| "compact"
| "marker"
| "table"
| "inline-table"
| "table-row-group"
| "table-header-group"
| "table-footer-group"
| "table-row"
| "table-column-group"
| "table-column"
| "table-cell"
| "table-caption"
| "none"
| "inherit"
}?,
attribute visibility { "visible" | "hidden" | "collapse"
| "inherit" }?,
attribute image-rendering {
"auto" | "optimizeSpeed" | "optimizeQuality" | "inherit"
}?,
attribute shape-rendering {
"auto"
| "optimizeSpeed"
| "crispEdges"
| "geometricPrecision"
| "inherit"
}?,
attribute text-rendering {
"auto"
| "optimizeSpeed"
| "optimizeLegibility"
| "geometricPrecision"
| "inherit"
}?,
attribute buffered-rendering {
"auto" | "dynamic" | "static" | "inherit"
}?)
& (attribute viewport-fill { "none" | rfc-color }?,
attribute viewport-fill-opacity { "inherit" | xsd:string }?)),
text
}
svgTitle =
element title {
(attribute id { xsd:NCName }
| attribute xml:id { xsd:NCName })?,
attribute xml:base { xsd:anyURI | xsd:string }?,
attribute xml:lang { xsd:language? }?,
attribute class { xsd:NMTOKENS }?,
attribute role { xsd:string }?,
attribute rel { xsd:string }?,
attribute rev { xsd:string }?,
attribute typeof { xsd:string }?,
attribute content { xsd:string }?,
attribute datatype { xsd:string }?,
attribute resource { xsd:string }?,
attribute about { xsd:string }?,
attribute property { xsd:string }?,
attribute xml:space { "default" | "preserve" }?,
attribute requiredFeatures { xsd:string }?,
attribute requiredExtensions { xsd:string }?,
attribute requiredFormats { xsd:string }?,
attribute requiredFonts { xsd:string }?,
attribute systemLanguage { xsd:string }?,
((attribute display {
"inline"
| "block"
| "list-item"
| "run-in"
| "compact"
| "marker"
| "table"
| "inline-table"
| "table-row-group"
| "table-header-group"
| "table-footer-group"
| "table-row"
| "table-column-group"
| "table-column"
| "table-cell"
| "table-caption"
| "none"
| "inherit"
}?,
attribute visibility { "visible" | "hidden"
| "collapse" | "inherit" }?,
attribute image-rendering {
"auto" | "optimizeSpeed" | "optimizeQuality" | "inherit"
}?,
attribute shape-rendering {
"auto"
| "optimizeSpeed"
| "crispEdges"
| "geometricPrecision"
| "inherit"
}?,
attribute text-rendering {
"auto"
| "optimizeSpeed"
| "optimizeLegibility"
| "geometricPrecision"
| "inherit"
}?,
attribute buffered-rendering {
"auto" | "dynamic" | "static" | "inherit"
}?)
& (attribute viewport-fill { "none" | rfc-color }?,
attribute viewport-fill-opacity { "inherit" | xsd:string }?)),
text
}
path =
element path {
(attribute id { xsd:NCName }
| attribute xml:id { xsd:NCName })?,
attribute xml:base { xsd:anyURI | xsd:string }?,
attribute xml:lang { xsd:language? }?,
attribute class { xsd:NMTOKENS }?,
attribute role { xsd:string }?,
attribute rel { xsd:string }?,
attribute rev { xsd:string }?,
attribute typeof { xsd:string }?,
attribute content { xsd:string }?,
attribute datatype { xsd:string }?,
attribute resource { xsd:string }?,
attribute about { xsd:string }?,
attribute property { xsd:string }?,
attribute xml:space { "default" | "preserve" }?,
attribute transform { xsd:string | "none" }?,
((attribute fill-opacity { "inherit" | xsd:string }?,
attribute stroke-opacity { "inherit" | xsd:string }?)
& (attribute fill { "none" | rfc-color }?,
attribute fill-rule { "inherit" | "nonzero" | "evenodd" }?,
attribute stroke { rfc-color }?,
attribute stroke-dasharray { "inherit" | "none" | xsd:string }?,
attribute stroke-dashoffset { "inherit" | xsd:string }?,
attribute stroke-linecap {
"butt" | "round" | "square" | "inherit"
}?,
attribute stroke-linejoin {
"miter" | "round" | "bevel" | "inherit"
}?,
attribute stroke-miterlimit { "inherit" | xsd:string }?,
attribute stroke-width { "inherit" | xsd:string }?,
attribute color { rfc-color }?,
attribute color-rendering {
"auto" | "optimizeSpeed" | "optimizeQuality" | "inherit"
}?)
& attribute vector-effect {
"none" | "non-scaling-stroke" | "inherit"
}?
& (attribute direction { "ltr" | "rtl" | "inherit" }?,
attribute unicode-bidi {
"normal" | "embed" | "bidi-override" | "inherit"
}?)
& (attribute solid-color { rfc-color }?,
attribute solid-opacity { "inherit" | xsd:string }?)
& (attribute display-align {
"auto" | "before" | "center" | "after" | "inherit"
}?,
attribute line-increment { "auto" | "inherit" | xsd:string }?)
& (attribute stop-color { rfc-color }?,
attribute stop-opacity { "inherit" | xsd:string }?)
& (attribute font-family { "inherit" | xsd:string }?,
attribute font-size { "inherit" | xsd:string }?,
attribute font-style {
"normal" | "italic" | "oblique" | "inherit"
}?,
attribute font-variant { "normal" | "small-caps" | "inherit" }?,
attribute font-weight {
"normal"
| "bold"
| "bolder"
| "lighter"
| "inherit"
}?,
attribute text-anchor {
"start" | "middle" | "end" | "inherit"
}?,
attribute text-align {
"start" | "center" | "end" | "inherit"
}?)),
attribute requiredFeatures { xsd:string }?,
attribute requiredExtensions { xsd:string }?,
attribute requiredFormats { xsd:string }?,
attribute requiredFonts { xsd:string }?,
attribute systemLanguage { xsd:string }?,
attribute d { xsd:string }?,
attribute pathLength { xsd:string }?,
attribute style { xsd:string }?, # Added to SVG-1.2-RFC (Inkscape)
(desc
| svgTitle)*
}
rect =
element rect {
(attribute id { xsd:NCName }
| attribute xml:id { xsd:NCName })?,
attribute xml:base { xsd:anyURI | xsd:string }?,
attribute xml:lang { xsd:language? }?,
attribute class { xsd:NMTOKENS }?,
attribute role { xsd:string }?,
attribute rel { xsd:string }?,
attribute rev { xsd:string }?,
attribute typeof { xsd:string }?,
attribute content { xsd:string }?,
attribute datatype { xsd:string }?,
attribute resource { xsd:string }?,
attribute about { xsd:string }?,