rework unicode-range wording

Author: John Daggett

css3-fonts/Fonts.html

@@ -77,9 +77,9 @@
    <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-->
 
-   <h1>CSS3 Module: Fonts</h1>
+   <h1>CSS Fonts Module Level 3</h1>
 
-   <h2 class="no-num no-toc" id=editors>Editor's Draft 20 January 2009</h2>
+   <h2 class="no-num no-toc" id=editors>Editor's Draft 21 January 2009</h2>
 
    <dl id=authors>
     <dt>This version:
@@ -1929,8 +1929,9 @@ <h3 id=font-reference><span class=secno>4.3 </span>Font reference: the
    title="&lt;font-face-name&gt;::definition of"><a
    name=value-def-font-face-name>&lt;font-face-name&gt;</a></span> is a
    format-specific string that uniquely identifies a single font face within
-   a larger family. For TrueType and OpenType fonts, the full font name is
-   used to reference a given face. Additionally, user agents may optionally
+   a larger family. For TrueType and OpenType fonts, the full font name as
+   defined in the font name table is used to reference a given face.
+   Additionally, for TrueType and OpenType fonts user agents may optionally
    support Postscript name lookup on platforms where that is appropriate. The
    notation for a &lt;font-face-name&gt; is the unique font face name
    enclosed by "local(" and ")" and the name can optionally be enclosed in
@@ -2097,11 +2098,8 @@ <h3 id=character><span class=secno>4.5 </span>Character range: the
    name=value-def-urange>&lt;urange&gt;</a></span> are expressed using
    hexadecimal numbers prefixed by "U+", corresponding to <a
    href="http://www.unicode.org/charts/">Unicode character code points</a>.
-   The character range can be a subset of the full character map of the
-   underlying font. The actual character map used during font matching is the
-   intersection of the unicode range specified and the underlying character
-   map of the font. The unicode-range descriptor serves as a hint for user
-   agents when deciding whether or not to download a font resource.
+   The unicode-range descriptor serves as a hint for user agents when
+   deciding whether or not to download a font resource.
 
   <p>Unicode range values are written using hexadecimal values and are case
    insensitive. Each is prefixed by "U+" and multiple, discontinuous ranges
@@ -2120,11 +2118,20 @@ <h3 id=character><span class=secno>4.5 </span>Character range: the
 
   <p>Interval ranges consisting of a single codepoint are valid, as are
    ranges specified with &lsquo;<code class=css>?</code>&rsquo; that lack an
-   initial digit. Ranges that have no meaning (e.g. U+400-32f) are omitted
-   rather than treated as parse errors, they have no effect on other ranges
-   in a list of ranges. If there are no meaningful ranges the descriptor is
-   omitted. Ranges that do not follow the syntax above are considered to be
-   parse errors and the descriptor is omitted.
+   initial digit. Ranges can overlap but interval ranges that descend (e.g.
+   U+400-32f) are invalid and omitted rather than treated as parse errors,
+   they have no effect on other ranges in a list of ranges. Without any valid
+   ranges, the descriptor is omitted. Ranges that do not fit any of the above
+   three forms are considered to be parse errors and the descriptor is
+   omitted. User agents may normalize the list of ranges into a list that is
+   different but represents the equivalent set of character code points.
+
+  <p>The character range can be a subset of the full character map of the
+   underlying font. The actual character map used during font matching is the
+   intersection of the unicode range specified and the underlying character
+   map of the font. Although Unicode only defines character codes in the
+   range U+0-10FFFF, values up to U+7FFFFFFF are allowed within unicode-range
+   range lists.
 
   <p>Example ranges for specific languages or characters: