- From: poot <cvsmail@w3.org>
- Date: Thu, 6 May 2010 10:18:40 +0900 (JST)
- To: public-html-diffs@w3.org
eliot: Changed abstract to emphasize that this specification is for web
authors rather than UAs; updated Processing Instructions and the XML
Declaration to more accurately account for requirements around using
UTF-8 and UTF-16; updated doctype to speak to case sensitivity; added
note excluding non-ASCII letters from lowercase requirement in attribute
names; called out xml declaration as specifically not processing
insstructions; changed named entity references from SHOULD to MUST;
removed reference to "'" as it exists in HTML5; changed should to
MUST in minimized tag syntax for empty elements;
http://dev.w3.org/cvsweb/html5/html-xhtml-author-guide/html-xhtml-authoring-guide.html?r1=1.5&r2=1.6&f=h
===================================================================
RCS file: /sources/public/html5/html-xhtml-author-guide/html-xhtml-authoring-guide.html,v
retrieving revision 1.5
retrieving revision 1.6
diff -u -d -r1.5 -r1.6
--- html-xhtml-authoring-guide.html 4 May 2010 21:05:50 -0000 1.5
+++ html-xhtml-authoring-guide.html 6 May 2010 01:18:24 -0000 1.6
@@ -47,12 +47,15 @@
<p>This document summarizes design guidelines for authors who wish
their XHTML or HTML documents to validate on either HTML or XML
parsers, assuming the parsers to be HTML5-compliant.
+ This specification is intended to be used by web authors. It is
+not a specification for user agents and creates no obligations on user
+agents.
Note that this recommendation does not define how HTML5-conforming
user agents should process HTML documents.
Nor does it define the meaning of the Internet Media Type
-text/html. For these definitions, see [<a href="#bib-HTML5"
-rel="biblioentry" class="bibref">HTML5</a>] and [<a href="#bib-RFC2854"
-rel="biblioentry" class="bibref">RFC2854</a>] respectively.
+text/html. For user agent guidance and for these definitions, see [<a
+href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a>] and [<a
+href="#bib-RFC2854" rel="biblioentry" class="bibref">RFC2854</a>].
</p>
<p><strong>Note:</strong> If your browser does not render the
fully-formatted version of this document with images and color fonts,
@@ -164,17 +167,46 @@
and the XML Declaration</h2>
<p>
You <em title="must not" class="rfc2119">must not</em> use processing
- instructions in a polyglot document. You <em title="should"
-class="rfc2119">should</em> use the HTML <code>meta</code> tag to
-specify character and coding in the document.
- If a polyglot document uses an encoding other than UTF8 or UTF16, you
- <em title="should" class="rfc2119">should</em> include the XML
+ instructions in a polyglot document.
+ Note that the parsing rules for the XML declaration are not
+processing instructions and are defined separately in <a
+href="http://www.w3.org/TR/REC-xml/#NT-XMLDecl">Prolog and Document Type
+ Declaration</a>.
+ <!-- TODO: Add Normative link once generated -->
+ </p>
+ <p>
+ You <em title="should" class="rfc2119">should</em> use the HTML <code>meta</code>
+ tag to specify character and coding in the document.
+ You <em title="may" class="rfc2119">may</em> use either UTF-8 or
+UTF-16, although generally UTF-8 is preferred. If you use UTF-16, you <em
+ title="should" class="rfc2119">should</em> include the BOM indicating
+UTF-16LE or UTF-16BE. In addition, you need not include the meta charset
+ declaration, because the parser would have to read UTF-16 in order to
+parse it by definition.
+ </p>
+ <p>
+ In short, for correct character encoding for a polyglot document, you
+ <em title="must" class="rfc2119">must</em> either:
+ </p><ul>
+ <li>Use UTF-8 or UTF-16 with the appropriate BOM.</li>
+ </ul>
+ <strong>OR</strong>
+ <ul>
+ <li>Use both the XML Declaration and <code>meta</code> tag to
+specify the appropriate character encoding.</li>
+ </ul>
+
+
+ <p>
+ If a polyglot document uses an encoding other than UTF-8 or UTF-16,
+you <em title="should" class="rfc2119">should</em> include the XML
declaration; however, in this case you <em title="should"
class="rfc2119">should</em> also include the HTML <code>meta</code> tag
-specifying the character set.
+specifying the character set.
When you use both the XML declaration and the HTML <code>meta</code>
tag, they <em title="must" class="rfc2119">must</em> specify the same
character and coding.
+
</p>
</div>
@@ -182,8 +214,11 @@
<!--OddPage--><h2><span class="secno">3. </span>The DOCTYPE</h2>
<p>
For a polyglot document, you <em title="must" class="rfc2119">must</em>
- use the <a href="http://dev.w3.org/html5/spec/syntax.html#the-doctype">HTML
- DOCTYPE</a>.
+ use the <code><!DOCTYPE html></code> doctype.
+ Note that for a polyglot document the string, <code>html</code>, <em
+title="must" class="rfc2119">must</em> be lower case.
+ For a pure HTML document, the string is defined as case-insensitive. [<a
+ href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a>]
</p>
</div>
@@ -264,7 +299,7 @@
<div class="section" id="case-sensitivity">
<h3><span class="secno">5.2 </span>Case-Sensitivity</h3>
<p>
- The following guidelines apply to markup, script, and CSS.
+ The following guidelines apply to markup, script, and CSS.
</p>
<div class="section" id="element-names">
@@ -330,7 +365,11 @@
<h4><span class="secno">5.2.2 </span>Attribute Names</h4>
<p>
You <em title="must" class="rfc2119">must</em> use the correct case
- for attribute names.
+ for attribute names.
+ When required, you <em title="must" class="rfc2119">must</em> use
+lower case letters for all ASCII letters; however, case requirements do
+not apply to non-ASCII letters such as Greek, Cyrillic, or non-ASCII
+Latin letters.
</p>
<ul>
<li>
@@ -420,6 +459,10 @@
<p>
You <em title="must" class="rfc2119">must</em> specify attribute
letters as lowercase.
+ When required, you <em title="must" class="rfc2119">must</em> use
+lower case letters for all ASCII letters; however, case requirements do
+not apply to non-ASCII letters such as Greek, Cyrillic, or non-ASCII
+Latin letters.
</p>
</div>
</div>
@@ -448,8 +491,8 @@
<li><code>source</code></li>
</ul>
<p>
- You <em title="should" class="rfc2119">should</em> use the
-minimized tag syntax for empty elements, e.g. <code><br/></code>.
+ You <em title="must" class="rfc2119">must</em> use the minimized
+ tag syntax for empty elements, e.g. <code><br/></code>.
The alternative syntax <code><br></br></code>
allowed by XML gives uncertain results in many existing user agents.
</p>
@@ -478,7 +521,7 @@
<!--OddPage--><h2><span class="secno">7. </span>Named Entity
References</h2>
<p>
- You <em title="should" class="rfc2119">should</em> use only the
+ You <em title="must" class="rfc2119">must</em> use only the
following named entity references:
</p>
<ul>
@@ -492,13 +535,6 @@
When you need entities beyond the previous list, use character
references.
</p>
- <p>
- The named character reference <code>&apos;</code> (the
-apostrophe, U+0027) was introduced in XML 1.0 but does not appear in
-HTML.
- Authors should therefore use <code>&#39;</code> instead of <code>&apos;</code>
- to work as expected in HTML user agents.
- </p>
</div>
Received on Thursday, 6 May 2010 01:19:08 UTC