various empty string namespace clarifications, see message at http://lists.w3.org/Archives/Public/www-style/2008Apr/0396.html and issues-2#9

fantasai · fantasai · commit f4525c32aaae · 2008-04-22T23:14:21.000Z
diff --git a/css3-namespace/Overview.html b/css3-namespace/Overview.html
@@ -11,15 +11,15 @@
  <body>
   <div class=head> <!--begin-logo-->
    <p><a href="http://www.w3.org/"><img alt=W3C height=48
-    src="http://www.w3.org/Icons/w3c_home" width=72></a> <!--end-logo--></p>
+    src="http://www.w3.org/Icons/w3c_home" width=72></a> <!--end-logo-->
 
    <h1 id=css-namespaces>CSS Namespaces Module</h1>
 
-   <h2 class="no-num no-toc" id=longstatus>Editor's Draft 16 April 2008</h2>
+   <h2 class="no-num no-toc" id=longstatus>Editor's Draft 22 April 2008</h2>
 
    <dl>
     <dt>This version:</dt>
-    <!--    <dd><a href="http://www.w3.org/TR/2008/WD-css3-namespace-20080416/">http://www.w3.org/TR/2008/WD-css3-namespace-20080416/</a></dd> -->
+    <!--    <dd><a href="http://www.w3.org/TR/2008/WD-css3-namespace-20080422/">http://www.w3.org/TR/2008/WD-css3-namespace-20080422/</a></dd> -->
 
     <dd><a
      href="http://dev.w3.org/csswg/css3-namespace/">http://dev.w3.org/csswg/css3-namespace/</a>
@@ -80,34 +80,9 @@ <h2 class="no-num no-toc" id=status>Status of this document</h2>
   <!--begin-status-->
 
   <p>This is a public copy of the editors' draft. It is provided for
-   discussion only and may change at any moment. Its publication here does
-   not imply endorsement of its contents by W3C. Don't cite this document
-   other than as work in progress.
-
-  <p>The (<a
-   href="http://lists.w3.org/Archives/Public/www-style/">archived</a>) public
-   mailing list <a href="mailto:www-style@w3.org">www-style@w3.org</a> (see
-   <a href="http://www.w3.org/Mail/Request">instructions</a>) is preferred
-   for discussion of this specification. When sending e-mail, please put the
-   text &#8220;css3-namespace&#8221; in the subject, preferably like this:
-   &#8220;[<!---->css3-namespace<!---->] <em>&hellip;summary of
-   comment&hellip;</em>&#8221;
-
-  <p>This document was produced by the <a href="/Style/CSS/members">CSS
-   Working Group</a> (part of the <a href="/Style/">Style Activity</a>).
-
-  <p>This document was produced by a group operating under the <a
-   href="/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent
-   Policy</a>. W3C maintains a <a href="/2004/01/pp-impl/32061/status"
-   rel=disclosure>public list of any patent disclosures</a> made in
-   connection with the deliverables of the group; that page also includes
-   instructions for disclosing a patent. An individual who has actual
-   knowledge of a patent which the individual believes contains <a
-   href="/Consortium/Patent-Policy-20040205/#def-essential">Essential
-   Claim(s)</a> must disclose the information in accordance with <a
-   href="/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the
-   W3C Patent Policy</a>.</p>
-  <!--end-status-->
+   discussion only and may change at any moment. It probably contains errors.
+   Its publication here does not imply endorsement of its contents by W3C.
+   <!--end-status-->
 
   <p>This specification is a <strong>Last Call Working Draft</strong>. All
    persons are encouraged to review this document and <strong>send comments
@@ -171,7 +146,7 @@ <h2 id=intro><span class=secno>1. </span>Introduction</h2>
     or what they mean: that depends on their context and is defined by a host
     language, such as Selectors (<a href="#SELECT"
     rel=biblioentry>[SELECT]<!--{{SELECT}}--></a>), that references the
-    syntax defined in the CSS Namespaces module.</p>
+    syntax defined in the CSS Namespaces module.
 
    <p>Note that a CSS client that does not support this module will (if it
     properly conforms to <a
@@ -191,7 +166,7 @@ <h2 id=conformance><span class=secno>2. </span>Conformance</h2>
     conformance requirements in this specification when implementing CSS or
     another host language that normatively references this specification.</p>
 
-   <p>Conformance to CSS Namespaces is defined for two classes:</p>
+   <p>Conformance to CSS Namespaces is defined for two classes:
 
    <dl>
     <dt><dfn id=style>style sheet</dfn>
@@ -219,14 +194,14 @@ <h2 id=conformance><span class=secno>2. </span>Conformance</h2>
 
    <p>Examples in this specification are introduced with the words "for
     example" or are set apart from the normative text with
-    <code>class="example"</code>, like this:</p>
+    <code>class="example"</code>, like this:
 
    <div class=example>
     <p>This is an example of an informative example.</p>
    </div>
 
    <p>Informative notes begin with the word "Note" and are set apart from the
-    normative text with <code>class="note"</code>, like this:</p>
+    normative text with <code>class="note"</code>, like this:
 
    <p class=note>Note, this is an informative note.</p>
 
@@ -329,6 +304,10 @@ <h3 id=syntax><span class=secno>3.1 </span>Syntax</h3>
     a literal string: as with the <code>STRING</code> syntax, no URI-specific
     normalization is applied.</p>
 
+   <p>All strings&#8212;including the empty string and strings representing
+    invalid URIs&#8212;are valid namespace names in <code>@namespace</code>
+    declarations.</p>
+
    <h3 id=scope><span class=secno>3.2 </span>Scope</h3>
 
    <p>The namespace prefix is declared only within the style sheet in which
@@ -340,7 +319,9 @@ <h3 id=prefixes><span class=secno>3.3 </span>Declaring Prefixes</h3>
 
    <p>A <dfn id=namespace>namespace prefix</dfn>, once declared, represents
     the namespace for which it was declared and can be used to indicate the
-    namespace of a namespace-qualified name.</p>
+    namespace of a namespace-qualified name. Namespace prefixes are, <a
+    href="http://www.w3.org/TR/CSS21/syndata.html#counter">like CSS counter
+    names</a>, case-sensitive.</p>
 
    <p>If in the namespace declaration the namespace prefix is omitted, then
     the namespace so declared is the default namespace. The <dfn
@@ -356,17 +337,17 @@ <h3 id=prefixes><span class=secno>3.3 </span>Declaring Prefixes</h3>
     must define how those unqualified names are to be interpreted when no
     default namespace is declared.</p>
 
+   <p>Where the empty string is not recognized as a possible namespace, local
+    names associated with an empty string default namespace must be
+    interpreted as being associated with no namespace.</p>
+
    <p class=note>Note that using default namespaces in conjunction with type
     selectors can cause UAs that support default namespaces and UAs that
     don't support default namespaces to interpret selectors differently. See
     <a href="http://www.w3.org/TR/css3-selectors/#downlevel">Namespaces and
     down-level clients</a> in the Selectors module <a href="#SELECT"
     rel=biblioentry>[SELECT]<!--{{SELECT}}--></a> for details.</p>
 
-   <p>Namespace prefixes are, <a
-    href="http://www.w3.org/TR/CSS21/syndata.html#counter">like CSS counter
-    names</a>, case-sensitive.</p>
-
    <p>If a namespace prefix or default namespace is declared more than once
     only the last declaration shall be used.</p>
   </div>
@@ -451,9 +432,22 @@ <h2 id=css-qnames><span class=secno>4. </span>CSS Qualified Names</h2>
      rule sets with an invalid selector to be completely ignored.</p>
    </div>
 
-   <p>In a CSS qualified name, a prefix that is declared to represent the
-    empty string namespace (<code>""</code>) is interpreted as representing
-    no namespace.</p>
+   <p>When a CSS qualified name is used in a context (such as Selectors <a
+    href="#SELECT" rel=biblioentry>[SELECT]<!--{{SELECT}}--></a>) that does
+    not recognize association with the empty string namespace and lack of a
+    namespace as two distinct, valid possibilities, prefixes representing the
+    empty string namespace and no namespace must be treated as equivalent.</p>
+
+   <div class=example>
+    <p>For example, given the namespace declarations:</p>
+
+    <pre>@namespace empty "";
+<!--  -->@namespace "";</pre>
+
+    <p>The <a href="http://www.w3.org/TR/css3-selectors/#type-selectors">type
+     selectors</a> <code>elem</code>, <code>|elem</code>, and
+     <code>empty|elem</code> are equivalent.</p>
+   </div>
   </div>
 
   <h2 class=no-num id=acknowledgments>Acknowledgments</h2>
diff --git a/css3-namespace/Overview.src.html b/css3-namespace/Overview.src.html
@@ -218,6 +218,10 @@ <h3 id="syntax">Syntax</h3>
     a literal string: as with the <code>STRING</code> syntax, no URI-specific
     normalization is applied.</p>
 
+  <p>All strings&#8212;including the empty string and strings representing
+    invalid URIs&#8212;are valid namespace names in <code>@namespace</code>
+    declarations.</p>
+
 <h3 id="scope">Scope</h3>
 
   <p>The namespace prefix is declared only within the style sheet in which its
@@ -229,7 +233,9 @@ <h3 id="prefixes">Declaring Prefixes</h3>
 
   <p>A <dfn>namespace prefix</dfn>, once declared, represents the namespace for
     which it was declared and can be used to indicate the namespace of a
-    namespace-qualified name.</p>
+    namespace-qualified name. Namespace prefixes are,
+    <a href="http://www.w3.org/TR/CSS21/syndata.html#counter">like CSS counter
+    names</a>, case-sensitive.</p>
 
   <p>If in the namespace declaration the namespace prefix is omitted, then the
     namespace so declared is the default namespace. The <dfn>default
@@ -242,15 +248,15 @@ <h3 id="prefixes">Declaring Prefixes</h3>
     names to the default namespace must define how those unqualified names are
     to be interpreted when no default namespace is declared.</p>
 
+  <p>Local names associated with an empty string default namespace must be
+    interpreted as being associated with no namespace.</p>
+
   <p class="note">Note that using default namespaces in conjunction with type
     selectors can cause UAs that support default namespaces and UAs that don't
     support default namespaces to interpret selectors differently. See
     <a href="http://www.w3.org/TR/css3-selectors/#downlevel">Namespaces and
     down-level clients</a> in the Selectors module [[SELECT]] for details.</p>
 
-  <p>Namespace prefixes are, <a href="http://www.w3.org/TR/CSS21/syndata.html#counter">like
-    CSS counter names</a>, case-sensitive.</p>
-
   <p>If a namespace prefix or default namespace is declared more than once only
     the last declaration shall be used.</p>
 </div>
@@ -325,9 +331,22 @@ <h2 id="css-qnames">CSS Qualified Names</h2>
     ignored.</p>
   </div>
 
-  <p>In a CSS qualified name, a prefix that is declared to represent the
-    empty string namespace (<code>""</code>) is interpreted as representing
-    no namespace.</p>
+  <p>When a CSS qualified name is used in a context (such as Selectors [[SELECT]])
+    that does not recognize association with the empty string namespace and
+    lack of a namespace as two distinct, valid possibilities, prefixes
+    representing the empty string namespace and no namespace must be treated
+    as equivalent.</p>
+
+  <div class="example">
+    <p>For example, given the namespace declarations:</p>
+
+    <pre>@namespace empty "";
+<!--  -->@namespace "";</pre>
+
+    <p>The <a href="http://www.w3.org/TR/css3-selectors/#type-selectors">type
+      selectors</a> <code>elem</code>, <code>|elem</code>, and
+      <code>empty|elem</code> are equivalent.</p>
+  </div>
 </div>
 
 <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
diff --git a/css3-namespace/issues-2.txt b/css3-namespace/issues-2.txt
@@ -73,3 +73,11 @@ Response: http://lists.w3.org/Archives/Public/www-style/2008Apr/0034.html
 Closed:   Accepted (to add note instead)
 Verified: http://lists.w3.org/Archives/Public/www-style/2008Apr/0299.html
 ----
+Issue 9.
+Summary:  Define declaration of empty default namespace
+From:     Anne van Kesteren
+Comment:  http://lists.w3.org/Archives/Public/public-css-testsuite/2008Mar/0015.html
+Testcase: http://lists.w3.org/Archives/Public/www-style/2008Apr/0391.html
+Response: http://lists.w3.org/Archives/Public/www-style/2008Apr/0396.html
+Closed:   Accepted
+----
