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-revision 1.14 by wakaba,
Mon Oct 22 10:46:10 2007 UTC
+revision 1.18 by wakaba,
Sun Oct 28 07:19:15 2007 UTC
 Line 10
  <div class="header">
  <h1>Selectors Serialization Format for Testing (<abbr>SSFT</abbr>)
  Specification</h1>
- <h2>Working Draft <time datetime=2007-10-22>22 October 2007</time></h2>
+ <h2>Working Draft <time datetime=2007-10-28>28 October 2007</time></h2>
  <dl class="versions-uri">
  <dt>This Version</dt>
 Line 98 
 in a tree structure and are used in Web
  <abbr>API</abbr></a>
  <cite class="bibref informative">[<a href="#ref-SAPI">SAPI</a>]</cite>.</p>
- <div class="issue ed">...</div>
+ <p>It is so flexible language that a conceptually same pattern
+ can be represented in inifnite numbers of instances of selectors.
+ It might be convinient for e.g. validation of a test result to
+ define a subset of the language, in which no semantically equivalent
+ selectors are contained.</p>
  <p><a href="http://dev.w3.org/cvsweb/csswg/cssom/Overview.html">The
  <abbr title="Cascading Style Sheets Object Model">CSSOM</abbr>
-Line 111 
 attribute.  However, the algorithm is in
+Line 115 
 attribute.  However, the algorithm is in
  <time datetime=2007-09-25>at the time of the writing</time>.
  Note that current Web browser implementations
  of the <code>selectorText</code> attribute are consistently broken
- in not escaping unsafe identifiers.</p>
+ in not escaping unsafe identifiers and therefore it is not wise
+ to deploy that format for testing.</p>
  </div>
-Line 128 
 document are to be interpreted as descri
+Line 133 
 document are to be interpreted as descri
 </a>
  <cite class="bibref normative">[<a href="#ref-KEYWORDS">KEYWORDS</a>]</cite>.</p>
+ <p>Requirements phrased in the imperative as part of algorithms are to be
+ interpreted with the meaning of the key word (<em class=rfc2119>MUST</em>)
+ used in introducing the algorithm.</p>
+ <p>Conformance requirements phrased as algorithms or specific steps
+ <em class=rfc2119>MAY</em> be implemented in any manner, so long as the end
+ result is equivalent.</p>
  <!-- Strictly speaking the paragraph below is not part of terminology. -->
  <p>All examples and notes in this specification are non$B!>(Bnormative,
  as are all sections explicitly marked non$B!>(Bnormative.  Everything
-Line 140 
 simple selector in a selector.</p>
+Line 153 
 simple selector in a selector.</p>
  </div>
  <div class="section" id="serializing">
- <h2>Serializing Selectors as
+ <h2>Serializing Selectors in
  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
  Representation</h2>
+ <p>Subsections of this section define algorithms
+ to <a href="#algorithm-serialize-a-simple-selector">serialize a simple
+ selector</a> or <a href="#algorithm-serialize-a-group-of-selectors">serialize
+ a group of selectors</a>.</p>
  <div class="issue ed">
- <p><a href="http://suika.fam.cx/gate/cvs/*checkout*/markup/html/whatpm/Whatpm/CSS/SelectorsSerializer.pm">See the reference implementation</a>
+ <p><a href="http://suika.fam.cx/gate/cvs/*checkout*/markup/html/whatpm/Whatpm/CSS/SelectorsSerializer.pm">See
- for now.</p>
+ also the reference implementation</a> for now.</p>
+ </div>
+ <div class="note memo">
+ <p>The serialized representation will not contain any comment.</p>
  </div>
+ <!-- TODO: link terms to Selectors -->
  <div class=section id=serializing-tokens>
  <h3>Serializing Tokens</h3>
- <p>To <dfn id=algorithm-normalize-an-ident title="normalize an IDENT">normalize
+ <p>To <dfn id=algorithm-normalize-an-ident title="normalize a string as an IDENT">normalize
- an <code>IDENT</code> (<dfn id=var-n><var>n</var></dfn>)</dfn>:</p>
+ a string (<dfn id=var-n><var>n</var></dfn>) as an <code>IDENT</code></dfn>,
+ the following algorithm <em class=rfc2119>MUST</em> be used:</p>
  <ol>
- <li>Replace the escape sequences (<code>\</code> and following
+ <li>If <var>n</var> is either an <code>IDENT</code> or a <code>HASH</code>,
- characters) in <var>n</var> by characters represented by them
+ replace the escape sequences (<code>\</code> and following characters) in
- respectively.</li>
+ <var>n</var> by characters represented by them respectively.</li>
+ <li>If <var>n</var> is a <code>HASH</code>, remove the leading
+ <code class=char>U+0023</code> <code class=charname>NUMBER SIGN</code>
+ (<code class=char>#</code>) character from <var>n</var>.</li>
  <li>If there is any character that is <em>not</em> one of
  <code class=char>U+002D</code> <code class=charname>HYPHEN-MINUS</code>
  (<code class=char>-</code>), <code class=char>U+0030</code>
-Line 207 
 character by string <code>\00002D</code>
+Line 234 
 character by string <code>\00002D</code>
  <li>Then, <var>n</var> is the result of the algorithm.</li>
  </ol>
- <p>To <dfn id=algorithm-normalize-a-string title="normalize a STRING">normalize
+ <p>To <dfn id=algorithm-normalize-a-string title="normalize a string (STRING or IDENT) as a STRING">normalize
- a <code>STRING</code> (<dfn id=var-s><var>s</var></dfn>)</dfn>:</p>
+ a string (<dfn id=var-s><var>s</var></dfn>) as a <code>STRING</code></dfn>,
+ the following algorithm <em class=rfc2119>MUST</em> be used:</p>
  <ol>
- <li><p>Replace the escape sequences (<code>\</code> and following
+ <li>If <var>s</var> is either an <code>IDENT</code> or a
- characters) in <var>s</var> by characters represented by them
+ <code>STRING</code>, replace the escape sequences (<code>\</code> and
+ following characters) in <var>s</var> by characters represented by them
  (or an empty string if <code>\</code> is immediately followed by
- newline character(s)) respectively.</p></li>
+ newline character(s)) respectively.</li>
- <li><p>Remove the quotation characters in <var>s</var>
+ <li>If <var>s</var> is a <code>STRING</code>, remove the quotation marks
- if <var>s</var> is a <code>STRING</code>.</p>
+ enclosing <var>s</var>.</li>
- <div class="note memo">
- <p>The input <var>s</var> to this algorithm may be an
- <code>IDENT</code>.</p>
- </div></li>
  <li><p>If there is any character that is <em>not</em> one of
  <code class=char>U+0020</code> <code class=charname>SPACE</code>,
  <code class=char>U+0021</code> <code class=charname>EXCLAMATION MARK</code>
-Line 267 
 representation.</p>
+Line 291 
 representation.</p>
  representations are literally compared.</p>
  </div>
+ <div class="issue ed">
+ <p>Need to define <dfn id=lower-case>lower$B!>(Bcase</dfn>.
+ It is tr/A-Z/a-z/ for now.</p>
+ </div>
  </div>
  <div class=section id=serializing-simple-selectors>
  <h3>Serializing Simple Selectors</h3>
+ <p>No <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
+ representation is defined for an invalid <a href="#simple-selector">simple
+ selector</a>.</p>
  <p>To
  <dfn id=algorithm-serialize-a-simple-selector title="serialize a simple selector">serialize
- a simple selector (<dfn><var id=var-ss>ss</var></dfn>)</dfn>:</p>
+ a simple selector (<dfn><var id=var-ss>ss</var></dfn>)</dfn>,
+ the following algorithm <em class=rfc2119>MUST</em> be used:</p>
+ <ol>
+ <li>Let <dfn id=var-r><var>r</var></dfn> an empty string.</li>
+ <li>Process <var>ss</var> as following:
  <dl class=switch>
  <dt>If <var>ss</var> is a type or universal selector</dt>
    <dd>
      <ol>
-     <li>
+     <li>Append a namespace prefix as following:
        <dl class=switch>
        <dt>If a namespace URI is specified (via namespace prefix, or
        by omitting namespace prefix where a default namespace is specified)</dt>
-         <dd class="ed">@@</dd>
+         <dd>Append the namespace URI as a
+         <a href="#algorithm-normalize-an-ident" title="normalize a string as an IDENT">normalized
+         <code>IDENT</code></a> to <var>r</var>.  Then, append a
+         <code class=char>U+007C</code>
+         <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
+         character to <var>r</var>.</dd>
        <dt>If the null namespace is specified (by zero$B!>(Blength namespace
        prefix)</dt>
          <dd>Append a <code class=char>U+007C</code>
          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
-         character to <var>result</var>.</dd>
+         character to <var>r</var>.</dd>
        <dt>If no namespace is specified (by namespace prefix <code>*</code>,
        or by omitting namespace prefix where no default namespace is
        specified)</dt>
-Line 297 
 a simple selector (<dfn><var id=var-ss>s
+Line 341 
 a simple selector (<dfn><var id=var-ss>s
          <code class=charname>ASTERISK</code> (<code class=char>*</code>)
          character, followed by a <code class=char>U+007C</code>
          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
-         character, to <var>result</var>.</dd>
+         character, to <var>r</var>.</dd>
        </dl>
      </li>
      <li>If <var>ss</var> is a type selector, append the
-     <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
+     <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) an IDENT">normalized</a>
-     local name to <var>result</var>.</li>
+     local name to <var>r</var>.</li>
      <li>If <var>ss</var> is a universal selector, append
      a <code class=char>U+002A</code> <code class=charname>ASTERISK</code>
-     (<code class=char>*</code>) character to <var>result</var>.</li>
+     (<code class=char>*</code>) character to <var>r</var>.</li>
      </ol>
    </dd>
  <dt>If <var>ss</var> is an attribute selector</dt>
-Line 313 
 a simple selector (<dfn><var id=var-ss>s
+Line 357 
 a simple selector (<dfn><var id=var-ss>s
      <ol>
      <li>Append a <code class=char>U+005B</code> <code class=charname>LEFT
      SQUARE BRACKET</code> (<code class=char>[</code>) to
-     <var>result</var>.</li>
+     <var>r</var>.</li>
      <li>
        Append a namespace prefix as following:
        <dl>
        <dt>If a namespace URI is specified</dt>
-         <dd class=ed>@@</dd>
+         <dd>Append the namespace URI as a
-         <dd class=ed>@@ Current reference implementation is wrong,
+         <a href="#algorithm-normalize-an-ident" title="normalize a string as an IDENT">normalized
-         since its result of sorting depends on namespace prefix.</dd>
+         <code>IDENT</code></a> to <var>r</var>.  Then, append a
+         <code class=char>U+007C</code>
+         <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
+         character to <var>r</var>.</dd>
        <dt>If the null namespace is specified</dt>
          <dd>Append a <code class=char>U+007C</code>
          <code class=charname>VERTICAL BAR</code> character to
-         <var>result</var>.</dd>
+         <var>r</var>.</dd>
        <dt>If no namespace is specified</dt>
          <dd>Append a <code class=char>U+002A</code>
          <code class=charname>ASTERISK</code> (<code class=char>*</code>)
          character, followed by a <code class=char>U+007C</code>
          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
-         character, to <var>result</var>.</dd>
+         character, to <var>r</var>.</dd>
        </dl>
      </li>
      <li>Append the
-     <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
+     <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
-     local name to <var>result</var>.</li>
+     local name to <var>r</var>.</li>
      <li>If a value is specified in <var>ss</var>:
        <ol>
        <li>Depending on the way to match, append <code>=</code>,
        <code>~=</code>, <code>|=</code>, <code>^=</code>,
-       <code>$=</code>, or <code>*=</code> to <var>result</var>.</li>
+       <code>$=</code>, or <code>*=</code> to <var>r</var>.</li>
        <li>Append the
        <a href="#algorithm-normalize-a-string" title="normalize a string">normalized</a>
-       value to <var>result</var>.</li>
+       value to <var>r</var>.</li>
        </ol>
      </li>
      <li>Append a <code class=char>U+005D</code> <code class=charname>RIGHT
      SQUARE BRACKET</code> (<code class=char>]</code>) to
-     <var>result</var>.</li>
+     <var>r</var>.</li>
      </ol>
    </dd>
  <dt>If <var>ss</var> is a class selector</dt>
    <dd>Append a <code class=char>U+002E</code> <code class=charname>FULL
    STOP</code> (<code class=char>.</code>) character, followed
-   by <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
+   by <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
-   class name, <var>result</var>.</dd>
+   class name, to <var>r</var>.</dd>
  <dt>If <var>ss</var> is an <abbr>ID</abbr> selector</dt>
    <dd>Append a <code class=char>U+0023</code> <code class=charname>NUMBER
    SIGN</code> (<code class=char>#</code>) character, followed
-   by <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
+   by <a href="#algorithm-normalize-an-ident" title="normalize a string (HASH except for the leading #) as an IDENT">normalized</a>
-   <abbr>ID</abbr>, to <var>result</var>.</dd>
+   <abbr>ID</abbr>, to <var>r</var>.</dd>
  <dt>If <var>ss</var> is a pseudo$B!>(Bclass selector</dt>
    <dd>
      <ol>
      <li>Append a <code class=char>U+003A</code>
      <code class=charname>COLON</code> (<code class=char>:</code>) character
-     to <var>result</var>.</li>
+     to <var>r</var>.</li>
      <li>Append the
-     <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
+     <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
-     name of the pseudo$B!>(Bclass to <var>result</var>.</li>
+     name (in <a href="#lower-case">lower$B!>(Bcase</a>) of the pseudo$B!>(Bclass to
+     <var>r</var>.</li>
      <li>Append any arguments as following:
        <dl class=switch>
        <dt>If the name of the pseudo$B!>(Bclass is <code>lang</code></dt>
-Line 377 
 a simple selector (<dfn><var id=var-ss>s
+Line 425 
 a simple selector (<dfn><var id=var-ss>s
            <ol>
            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT
            PARENTHESIS</code> (<code class=char>(</code>) character
-           to <var>result</var>.</li>
+           to <var>r</var>.</li>
            <li>Append the
-           <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
+           <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
-           language tag (the argument) to <var>result</var>.</li>
+           language tag (the argument) to <var>r</var>.
+           <span class="issue ed">Should we normalize cases?</span></li>
            <li>Append a <code class=char>U+0029</code>
            <code class=charname>RIGHT PARENTHESIS</code>
            (<code class=char>)</code>) character
-           to <var>result</var>.</li>
+           to <var>r</var>.</li>
            </ol>
          </dd>
        <dt>If the name of the pseudo$B!>(Bclass is
-Line 393 
 a simple selector (<dfn><var id=var-ss>s
+Line 442 
 a simple selector (<dfn><var id=var-ss>s
            <ol>
            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT
            PARENTHESIS</code> (<code class=char>(</code>) character
-           to <var>result</var>.</li>
+           to <var>r</var>.</li>
            <li>Append the
            <a href="#algorithm-normalize-a-string" title="normalize a string">normalized</a>
-           string (the argument) to <var>result</var>.</li>
+           string (the argument) to <var>r</var>.</li>
            <li>Append a <code class=char>U+0029</code>
            <code class=charname>RIGHT PARENTHESIS</code>
            (<code class=char>)</code>) character
-           to <var>result</var>.</li>
+           to <var>r</var>.</li>
            </ol>
          </dd>
        <dt>If name of the pseudo$B!>(Bclass is either <code>nth-child</code>,
-Line 410 
 a simple selector (<dfn><var id=var-ss>s
+Line 459 
 a simple selector (<dfn><var id=var-ss>s
            <ol>
            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT
            PARENTHESIS</code> (<code class=char>(</code>) character
-           to <var>result</var>.</li>
+           to <var>r</var>.</li>
            <li>Append <span class=ed>@@ normalized</span>
-           integer <var>a</var> to <var>result</var>.
+           integer <var>a</var> to <var>r</var>.
            If the argument is a keyword <code>odd</code> or <code>even</code>,
            <var>a</var> is <code>2</code>.  If <var>a</var> and
            <code>n</code> is omitted, <var>a</var> is assumed as
-Line 423 
 a simple selector (<dfn><var id=var-ss>s
+Line 472 
 a simple selector (<dfn><var id=var-ss>s
            character).</li>
            <li>Append a <code class=char>U+006E</code>
            <code class=charname>LATIN SMALL LETTER N</code>
-           (<code class=char>n</code>) character to <var>result</var>.</li>
+           (<code class=char>n</code>) character to <var>r</var>.</li>
            <li>Append <span class=ed>@@ normalized</span>
-           integer <var>b</var> to <var>result</var>.
+           integer <var>b</var> to <var>r</var>.
            It <em class=rfc2119>MUST</em> be preceded by a sign,
            either <code class=char>U+002B</code> <code class=charname>PLUS
            SIGN</code> (<code class=char>+</code>) or
-Line 442 
 a simple selector (<dfn><var id=var-ss>s
+Line 491 
 a simple selector (<dfn><var id=var-ss>s
            <li>Append a <code class=char>U+0029</code>
            <code class=charname>RIGHT PARENTHESIS</code>
            (<code class=char>)</code>) character
-           to <var>result</var>.</li>
+           to <var>r</var>.</li>
            </ol>
          </dd>
        <dt>If the name of the pseudo$B!>(Bclass is <code>not</code></dt>
-Line 456 
 a simple selector (<dfn><var id=var-ss>s
+Line 505 
 a simple selector (<dfn><var id=var-ss>s
              <code class=charname>LATIN SMALL LETTER T</code>, and
              <code class=char>U+0028</code> <code class=charname>LEFT
              PARENTHESIS</code> (<code>:not(</code>), followed by a
-             <a href="#newline">newline</a>, to <var>result</var>.</li>
+             <a href="#newline">newline</a>, to <var>r</var>.</li>
              <li>Append four <code class=char>U+0020</code>
              <code class=charname>SPACE</code> characters to
-             <var>result</var>.</li>
+             <var>r</var>.</li>
              <li>Append four <code class=char>U+0020</code>
              <code class=charname>SPACE</code> characters to
-             <var>result</var> again.</li>
+             <var>r</var> again.</li>
              <li><a href="#algorithm-serialize-a-simple-selector">Serialize
              the simple selector specified as the argument to the
              <code>not</code> pseudo$B!>(Bclass</a>.</li>
              <li>Append a <a href="#newline">newline</a> to
-             <var>result</var>.</li>
+             <var>r</var>.</li>
              <li>Append four <code class=char>U+0020</code>
              <code class=charname>SPACE</code> characters to
-             <var>result</var>.</li>
+             <var>r</var>.</li>
              <li>Append a <code class=char>U+0029</code>
              <code class=charname>RIGHT PARENTHESIS</code>
              (<code class=char>)</code>) character
-             to <var>result</var>.</li>
+             to <var>r</var>.</li>
            </ol>
          </dd>
+       <dt>Otherwise</dt>
+         <dd>The pseudo$B!>(Bclass is not supported by this version of
+         <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
+         and therefore no
+         <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
+         representation is defined for <var>ss</var>.  Stop the algorithm.</dd>
        </dl>
      </li>
      </ol>
-Line 486 
 a simple selector (<dfn><var id=var-ss>s
+Line 541 
 a simple selector (<dfn><var id=var-ss>s
      <ol>
      <li>Append two <code class=char>U+003A</code>
      <code class=charname>COLON</code> characters (<code>::</code>)
-     to <var>result</var>.</li>
+     to <var>r</var>.</li>
      <li>Append the
-     <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
+     <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
-     name of the pseudo$B!>(Belement to <var>result</var>.</li>
+     name (in <a href="#lower-case">lower$B!>(Bcase</a>) of the pseudo$B!>(Belement
-     <!-- For future version: append "(", arguments, ")", if any. -->
+     to <var>r</var>.</li>
+     <li>If the pseudo$B!>(Belement has any arguments:
+         The pseudo$B!>(Belement is not supported by this version of
+         <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
+         and therefore no
+         <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
+         representation is defined for <var>ss</var>.  Stop the algorithm.
+     </li>
      </ol>
    </dd>
  </dl>
+ </li>
+ <li>Then, <var>r</var> is the
+ <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
+ representation of <var>ss</var>.</li>
+ </ol>
  </div>
-Line 501 
 a simple selector (<dfn><var id=var-ss>s
+Line 568 
 a simple selector (<dfn><var id=var-ss>s
  <h3>Serializing Groups of Selectors</h3>
  <p>No <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
- representation is defined for an invalid group of selectors.</p>
+ representation is defined for an invalid
+ <a href="http://www.w3.org/TR/css3-selectors/#grouping">group of
- <div class="note memo">
+ selectors</a>.</p>
- <p>The serialized representation will not contain any comment.</p>
- </div>
- <!-- TODO: link terms to Selectors -->
  <p>To
  <dfn id=algorithm-serialize-a-group-of-selectors title="serialize a group of selectors">serialize
- a group of selectors (<dfn id=var-gs><var>gs</var></dfn>)</dfn>:</p>
+ a group of selectors (<dfn id=var-gs><var>gs</var></dfn>)</dfn>,
+ the following algorithm <em class=rfc2119>MUST</em> be used:</p>
  <ol>
  <li>Let <dfn id=var-result><var>result</var></dfn> an empty string.</li>
  <li>For each selector (<dfn id=var-selector><var>selector</var></dfn>) in
  <var>gs</var>:
    <ol>
    <li>If <var>selector</var> is <em>not</em> the first selector
-   in the group of selectors, then append a <code class=char>U+002C</code>
+   in the <var>gs</var>, then append a <code class=char>U+002C</code>
    <code class=charname>COMMA</code> (<code class=char>,</code>) followed by a
    <a href="#newline">newline</a> to <var>result</var>.</li>
    <li>Append four <code class=char>U+0020</code>
    <code class=charname>SPACE</code> characters to <var>result</var>.</li>
    <li>Process each sequence of simple selectors or
-   combinator in <var>selector</var> by following algorithm:
+   combinator in <var>selector</var> as following:
      <dl class=switch>
      <dt>If it is a sequence of simle selector
      (<dfn id=var-sss><var>sss</var></dfn>)</dt>
-Line 541 
 a group of selectors (<dfn id=var-gs><va
+Line 605 
 a group of selectors (<dfn id=var-gs><va
          <ol>
          <li>Append two <code class=char>U+0020</code>
          <code class=charname>SPACE</code> characters to <var>result</var>.</li>
-         <li>
+         <li>Process <var>c</var> as following:
            <dl class=switch>
            <dt>If <var>c</var> is descendant combinator (white space)</dt>
              <dd>Append a <code class=char>U+0020</code>
-Line 584 
 representation of <var>gs</var>.</li>
+Line 649 
 representation of <var>gs</var>.</li>
  <div class="section" id="parsing">
  <h2>Parsing
  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
- Groups of Selectors</h2>
+ Representations of Selectors</h2>
- <p>Since <a href="#serializing">the serializing algorithm</a> is
+ <p>Since <a href="#algorithm-serialize-a-group-of-selectors">the serializing
- so designed that it always output a valid
+ algorithm for groups of selectors</a> is so designed that it always outputs a
- <a href="http://www.w3.org/TR/css3-selectors/#grouping">group of
+ valid <a href="http://www.w3.org/TR/css3-selectors/#grouping">group of
  selectors</a>, no special parser for the
  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
  representation is necessary.  Any conforming parser for
  <a href="http://www.w3.org/TR/css3-selectors/#grouping">groups of
  selectors</a> <em class=rfc2119>MAY</em> be used
  to parse <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
- representations of groups of selectors.</p>
+ representations of
+ <a href="http://www.w3.org/TR/css3-selectors/#grouping">groups of
+ selectors</a>.</p>
+ <p>Likewise, <a href="#algorithm-serialize-a-simple-selector">the serializing
+ algorithm for simple selectors</a> always outputs a valid
+ <a href="#simple-selector">simple selector</a> and therefore any
+ conforming parser for <a href="#simple-selector">simple selector</a>
+ <em class=rfc2119>MAY</em> be used to parse
+ <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
+ representations of <a href="#simple-selector">simple selectors</a>.</p>
  </div>
  <div class="section" id="examples">
-Line 631 
 by choosing <q>Selectors</q> radio butto
+Line 706 
 by choosing <q>Selectors</q> radio butto
    <a href="urn:ietf:bcp:14"><abbr title="Best Current Practice">BCP</abbr>
 </a>, <abbr title="Request for Comments">RFC</abbr> 2119,
    <time datetime=1997-03>March 1997</time>.
-   This version of the specification is referenced</dd>
+   This version of the specification is referenced.</dd>
  <dt id=ref-SELECTORS>SELECTORS</dt>
    <dd><a href="http://www.w3.org/TR/2005/WD-css3-selectors-20051215"><cite>Selectors</cite></a>,
    <abbr title="World Wide Web Consortium">W3C</abbr> Working Draft,

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