make namespace prefixes case-sensitive, consistent with recent resolution on CSS2.1 counter names

Author: fantasai

css3-namespace/Overview.html

@@ -326,13 +326,8 @@ <h3 id=prefixes><span class=secno>3.3. </span>Declaring Prefixes</h3>
     default namespace is declared.</p>
 
    <p>Namespace prefixes are, <a
-    href="http://www.w3.org/TR/CSS21/syndata.html#q6">like CSS property
-    names</a>, case-insensitive.</p>
-
-   <p class=note>Note, this does not cause any conflict with languages that
-    use case-sensitive prefixes because <a href="#expanded-name-match">only
-    the expanded name matters</a>, not the prefix, and therefore the prefixes
-    need not be identical for the names to match.</p>
+    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>

css3-namespace/Overview.src.html

@@ -232,13 +232,8 @@ <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>Namespace prefixes are, <a href="http://www.w3.org/TR/CSS21/syndata.html#q6">like
-    CSS property names</a>, case-insensitive.</p>
-
-  <p class="note">Note, this does not cause any conflict with languages that
-    use case-sensitive prefixes because <a href="#expanded-name-match">only the
-    expanded name matters</a>, not the prefix, and therefore the prefixes need
-    not be identical for the names to match.</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>