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revision 1.8 by wakaba, Mon Oct 15 00:32:05 2007 UTC revision 1.14 by wakaba, Mon Oct 22 10:46:10 2007 UTC
# Line 10  Line 10 
10  <div class="header">  <div class="header">
11  <h1>Selectors Serialization Format for Testing (<abbr>SSFT</abbr>)  <h1>Selectors Serialization Format for Testing (<abbr>SSFT</abbr>)
12  Specification</h1>  Specification</h1>
13  <h2>Working Draft <time datetime=2007-10-15>15 October 2007</time></h2>  <h2>Working Draft <time datetime=2007-10-22>22 October 2007</time></h2>
14    
15  <dl class="versions-uri">  <dl class="versions-uri">
16  <dt>This Version</dt>  <dt>This Version</dt>
# Line 63  available at <code class="URI">&lt;<a Line 63  available at <code class="URI">&lt;<a
63  at the time of its publication.  Other documents  at the time of its publication.  Other documents
64  might supersede this document.</em></p>  might supersede this document.</em></p>
65    
66  <p>This document is a working draft, produced as part  <p>This document is a working draft, produced as part of the
67    <a href="http://suika.fam.cx/www/markup/html/whatpm/readme">Whatpm</a>
68    subproject
69  of the <a href="http://suika.fam.cx/www/manakai-core/doc/web/">manakai</a>  of the <a href="http://suika.fam.cx/www/manakai-core/doc/web/">manakai</a>
70  project.  It might be updated, replaced, or obsoleted by  project.  It might be updated, replaced, or obsoleted by
71  other documents at any time.  It is inappropriate to  other documents at any time.  It is inappropriate to
# Line 116  in not escaping unsafe identifiers.</p> Line 118  in not escaping unsafe identifiers.</p>
118  <div class="section" id="terminology">  <div class="section" id="terminology">
119  <h2>Terminology</h2>  <h2>Terminology</h2>
120    
121  <p>The key words <q><em class="rfc2119">MUST</em></q>,  <p>The key words <q><dfn id=must><em class="rfc2119">MUST</em></dfn></q>,
122  <q><em class="rfc2119">MUST NOT</em></q>,  <q><dfn id=must-not><em class="rfc2119">MUST NOT</em></dfn></q>,
123  <q><em class="rfc2119">SHOULD</em></q>,  <q><dfn id=should><em class="rfc2119">SHOULD</em></dfn></q>,
124  <q><em class="rfc2119">SHOULD NOT</em></q>, and  <q><dfn id=should-not><em class="rfc2119">SHOULD NOT</em></dfn></q>, and
125  <q><em class=rfc2119>MAY</em></q> in this  <q><dfn id=may><em class=rfc2119>MAY</em></dfn></q> in this
126  document are to be interpreted as described in  document are to be interpreted as described in
127  <a href="urn:ietf:rfc:2119"><abbr title="Request for Comments">RFC</abbr>  <a href="urn:ietf:rfc:2119"><abbr title="Request for Comments">RFC</abbr>
128  2119</a>  2119</a>
# Line 138  simple selector in a selector.</p> Line 140  simple selector in a selector.</p>
140  </div>  </div>
141    
142  <div class="section" id="serializing">  <div class="section" id="serializing">
143  <h2>Serializing Groups of Selectors</h2>  <h2>Serializing Selectors as
144    <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
145    Representation</h2>
146    
147  <div class="issue ed">  <div class="issue ed">
148  <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 the reference implementation</a>
149  for now.</p>  for now.</p>
150  </div>  </div>
151    
152  <p>No <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  <div class=section id=serializing-tokens>
153  representation is defined for an invalid group of selectors.</p>  <h3>Serializing Tokens</h3>
154    
155    <p>To <dfn id=algorithm-normalize-an-ident title="normalize an IDENT">normalize
156    an <code>IDENT</code> (<dfn id=var-n><var>n</var></dfn>)</dfn>:</p>
157    <ol>
158    <li>Replace the escape sequences (<code>\</code> and following
159    characters) in <var>n</var> by characters represented by them
160    respectively.</li>
161    <li>If there is any character that is <em>not</em> one of
162    <code class=char>U+002D</code> <code class=charname>HYPHEN-MINUS</code>
163    (<code class=char>-</code>), <code class=char>U+0030</code>
164    <code class=charname>DIGIT ZERO</code>
165    (<code class=char>0</code>) to <code class=char>U+0039</code>
166    <code class=charname>DIGIT NINE</code> (<code class=char>9</code>),
167    <code class=char>U+0041</code> <code class=charname>LATIN CAPITAL LETTER
168    A</code> (<code class=char>A</code>) to <code class=char>U+005A</code>
169    <code class=charname>LATIN CAPITAL LETTER Z</code> (<code class=char>Z</code>),
170    <code class=char>U+005F</code> <code class=charname>LOW LINE</code>
171    (<code class=char>_</code>), <code class=char>U+0061</code>
172    <code class=charname>LATIN SMALL LETTER A</code>
173    (<code class=char>a</code>) to <code class=char>U+006A</code>
174    <code class=charname>LATIN SMALL LETTER Z</code> (<code class=char>z</code>),
175    <code class=char>U+0080</code> to <code class=char>U+D7FF</code>, or
176    <code class=char>U+E000</code> to <code class=char>U+10FFFF</code> in
177    <var>n</var>, then replace it by string <code>\<var>HHHHHH</var></code>, where
178    <dfn id=var-HHHHHH><var>HHHHHH</var></dfn> is the upper$B!>(Bcase zero$B!>(Bpadded
179    hexadecimal representation of the character.  If the character
180    is outside the range of <code>[<code class=char>U+0000</code>,
181    <code class=char>U+10FFFF</code>]</code>, <var>HHHHHH</var>
182    <em class=rfc2119>MUST</em> be <code>FFFFFF</code>.</li>
183    <li>If the first character in <var>n</var> is one of
184    <code class=char>U+0030</code> <code class=charname>DIGIT ZERO</code>
185    (<code class=char>0</code>) to <code class=char>U+0039</code>
186    <code class=charname>DIGIT NINE</code> (<code class=char>9</code>),
187    then prepend a string <code>\00003</code> at the beginning of
188    <var>n</var>.</li>
189    <li>If the first character in <var>n</var> is <code class=char>U+002D</code>
190    <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>) and
191    the second character, if any, is <em>not</em> one of
192    <code class=char>U+0041</code> <code class=charname>LATIN CAPITAL LETTER
193    A</code> (<code class=char>A</code>) to <code class=char>U+005A</code>
194    <code class=charname>LATIN CAPITAL LETTER Z</code> (<code class=char>Z</code>),
195    <code class=char>U+005F</code> <code class=charname>LOW LINE</code>
196    (<code class=char>_</code>), <code class=char>U+0061</code>
197    <code class=charname>LATIN SMALL LETTER A</code>
198    (<code class=char>a</code>) to <code class=char>U+006A</code>
199    <code class=charname>LATIN SMALL LETTER Z</code> (<code class=char>z</code>),
200    <code>U+0080</code> to <code>U+D7FF</code>, or
201    <code>U+E000</code> to <code>U+10FFFF</code>, or
202    <var>n</var> is equal to <code class=char>U+002D</code>
203    <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>), then
204    replace the <code class=char>U+002D</code>
205    <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>)
206    character by string <code>\00002D</code>.</li>
207    <li>Then, <var>n</var> is the result of the algorithm.</li>
208    </ol>
209    
210    <p>To <dfn id=algorithm-normalize-a-string title="normalize a STRING">normalize
211    a <code>STRING</code> (<dfn id=var-s><var>s</var></dfn>)</dfn>:</p>
212    <ol>
213    <li><p>Replace the escape sequences (<code>\</code> and following
214    characters) in <var>s</var> by characters represented by them
215    (or an empty string if <code>\</code> is immediately followed by
216    newline character(s)) respectively.</p></li>
217    <li><p>Remove the quotation characters in <var>s</var>
218    if <var>s</var> is a <code>STRING</code>.</p>
219    
220  <div class="note memo">  <div class="note memo">
221  <p>The serialized representation will not contain any comment.</p>  <p>The input <var>s</var> to this algorithm may be an
222  </div>  <code>IDENT</code>.</p>
223    </div></li>
224    <li><p>If there is any character that is <em>not</em> one of
225    <code class=char>U+0020</code> <code class=charname>SPACE</code>,
226    <code class=char>U+0021</code> <code class=charname>EXCLAMATION MARK</code>
227    (<code class=char>!</code>), <code class=char>U+0023</code>
228    <code class=charname>NUMBER SIGN</code> (<code class=char>#</code>) to
229    <code class=char>U+005B</code> <code class=charname>LEFT SQUARE
230    BRACKET</code>, <code class=char>U+005D</code> <code class=charname>RIGHT
231    SQUARE BRACKET</code> to <code class=char>U+D7FF</code>, or
232    <code class=char>U+E000</code> to <code class=char>U+10FFFF</code> in
233    <var>s</var>, then replace it by string <code>\<var>HHHHHH</var></code>, where
234    <dfn id=var-HHHHHH><var>HHHHHH</var></dfn> is the upper$B!>(Bcase zero$B!>(Bpadded
235    hexadecimal representation of the character.  If the character
236    is outside the range of <code>[<code class=char>U+0000</code>,
237    <code class=char>U+10FFFF</code>]</code>, <var>HHHHHH</var>
238    <em class=rfc2119>MUST</em> be <code>FFFFFF</code>.</p></li>
239    <li><p>Insert a <code class=char>U+0022</code> <code class=charname>QUOTATION
240    MARK</code> (<code class=char>"</code>) at the beginning of
241    <var>s</var>.</p></li>
242    <li><p>Insert a <code class=char>U+0022</code> <code class=charname>QUOTATION
243    MARK</code> (<code class=char>"</code>) at the end of <var>s</var>.</p></li>
244    <li><p>Then, <var>s</var> is the result of the algorithm.</p></li>
245    </ol>
246    
247  <!-- TODO: link terms to Selectors -->  <p>A <dfn id=newline title=newline>newline</dfn>
248    <em class=rfc2119>SHOULD</em> be represented as a
249    <code class=char>U+000A</code> <code class=charname>LINE FEED</code>
250    character.  However, depending on the context where
251    the <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
252    representation is in use, a sequence of
253    <code class=char>U+000D</code> <code class=charname>CARRIAGE RETURN</code>
254    followed by a <code class=char>U+000A</code>
255    <code class=charname>LINE FEED</code> (i.e. a
256    <code>CRLF</code> sequence) or a character
257    <code class=char>U+000D</code> <code class=charname>CARRIAGE RETURN</code>
258    <em class=rfc2119>MAY</em> be used as a <a href="#newline">newline</a> instead.
259    <a href="#newline">Newline</a> representations
260    <em class=rfc2119>SHOULD</em> be consistent in an
261    <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
262    representation.</p>
263    
264  <p>To  <div class="note memo">
265  <dfn id=algorithm-serialize-a-group-of-selectors title="serialize a group of selectors">serialize  <p>Therefore, newlines must be normalized before
 a group of selectors (<dfn id=var-gs><var>gs</var></dfn>)</dfn>:</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>  
   <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:  
     <dl class=switch>  
     <dt>If it is a sequence of simle selector  
     (<dfn id=var-sss><var>sss</var></dfn>)</dt>  
       <dd class=ed>@@</dd>  
     <dt>If it is a combinator (<dfn id=var-c><var>c</var></dfn>)</dt>  
       <dd>  
         <ol>  
         <li>Append two <code class=char>U+0020</code>  
         <code class=charname>SPACE</code> characters to <var>result</var>.</li>  
         <li>  
           <dl class=switch>  
           <dt>If <var>c</var> is descendant combinator (white space)</dt>  
             <dd>Append a <code class=char>U+0020</code>  
             <code class=charname>SPACE</code> character to  
             <var>result</var>.</dd>  
           <dt>If <var>c</var> is child combinator  
           (<code class=char>></code>)</dt>  
             <dd>Append a <code class=char>U+003E</code>  
             <code class=charname>GREATER-THAN SIGN</code>  
             (<code class=char>></code>) character to <var>result</var>.</dd>  
           <dt>If <var>c</var> is adjacent sibling combinator  
           (<code class=char>+</code>)</dt>  
             <dd>Append a <code class=char>U+002B</code>  
             <code class=charname>PLUS SIGN</code> (<code class=char>+</code>)  
             character to <var>result</var>.</dd>  
           <dt>If <var>c</var> is general sibling combinator  
           (<code class=char>~</code>)</dt>  
             <dd>Append a <code class=char>U+007E</code>  
             <code class=charname>TILDE</code> (<code class=char>~</code>)  
             character to <var>result</var>.</dd>  
           </dl>  
         </li>  
         <li>Append a <code class=char>U+0020</code>  
         <code class=charname>SPACE</code> character to  
         <var>result</var>.</li>  
         </ol>  
       </dd>  
     </dl>  
   </ol>  
 </li>  
 <li>Then, <var>result</var> is the  
266  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
267  representation of <var>gs</var>.</li>  representations are literally compared.</p>
268  </ol>  </div>
269    
270    </div>
271    
272    
273    <div class=section id=serializing-simple-selectors>
274    <h3>Serializing Simple Selectors</h3>
275    
276  <p>To  <p>To
277  <dfn id=algorithm-serialize-a-simple-selector title="serialize a simple selector">serialize  <dfn id=algorithm-serialize-a-simple-selector title="serialize a simple selector">serialize
# Line 243  a simple selector (<dfn><var id=var-ss>s Line 301  a simple selector (<dfn><var id=var-ss>s
301        </dl>        </dl>
302      </li>      </li>
303      <li>If <var>ss</var> is a type selector, append the      <li>If <var>ss</var> is a type selector, append the
304      <span class=ed>@@ normalized</span> local name to <var>result</var>.</li>      <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
305        local name to <var>result</var>.</li>
306      <li>If <var>ss</var> is a universal selector, append      <li>If <var>ss</var> is a universal selector, append
307      a <code class=char>U+002A</code> <code class=charname>ASTERISK</code>      a <code class=char>U+002A</code> <code class=charname>ASTERISK</code>
308      (<code class=char>*</code>) character to <var>result</var>.</li>      (<code class=char>*</code>) character to <var>result</var>.</li>
309      </ol>      </ol>
310    </dd>    </dd>
311  <dt>If <var>ss</var> is an attribute selector</dt>  <dt>If <var>ss</var> is an attribute selector</dt>
312    <dd class=ed>@@</dd>    <dd>
313        <ol>
314        <li>Append a <code class=char>U+005B</code> <code class=charname>LEFT
315        SQUARE BRACKET</code> (<code class=char>[</code>) to
316        <var>result</var>.</li>
317        <li>
318          Append a namespace prefix as following:
319          <dl>
320          <dt>If a namespace URI is specified</dt>
321            <dd class=ed>@@</dd>
322            <dd class=ed>@@ Current reference implementation is wrong,
323            since its result of sorting depends on namespace prefix.</dd>
324          <dt>If the null namespace is specified</dt>
325            <dd>Append a <code class=char>U+007C</code>
326            <code class=charname>VERTICAL BAR</code> character to
327            <var>result</var>.</dd>
328          <dt>If no namespace is specified</dt>
329            <dd>Append a <code class=char>U+002A</code>
330            <code class=charname>ASTERISK</code> (<code class=char>*</code>)
331            character, followed by a <code class=char>U+007C</code>
332            <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
333            character, to <var>result</var>.</dd>
334          </dl>
335        </li>
336        <li>Append the
337        <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
338        local name to <var>result</var>.</li>
339        <li>If a value is specified in <var>ss</var>:
340          <ol>
341          <li>Depending on the way to match, append <code>=</code>,
342          <code>~=</code>, <code>|=</code>, <code>^=</code>,
343          <code>$=</code>, or <code>*=</code> to <var>result</var>.</li>
344          <li>Append the
345          <a href="#algorithm-normalize-a-string" title="normalize a string">normalized</a>
346          value to <var>result</var>.</li>
347          </ol>
348        </li>
349        <li>Append a <code class=char>U+005D</code> <code class=charname>RIGHT
350        SQUARE BRACKET</code> (<code class=char>]</code>) to
351        <var>result</var>.</li>
352        </ol>
353      </dd>
354  <dt>If <var>ss</var> is a class selector</dt>  <dt>If <var>ss</var> is a class selector</dt>
355    <dd>Append a <code class=char>U+002E</code> <code class=charname>FULL    <dd>Append a <code class=char>U+002E</code> <code class=charname>FULL
356    STOP</code> (<code class=char>.</code>) character, followed    STOP</code> (<code class=char>.</code>) character, followed
357    by <span class=ed>@@ normalized</span> class name,    by <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
358    <var>result</var>.</dd>    class name, <var>result</var>.</dd>
359  <dt>If <var>ss</var> is an <abbr>ID</abbr> selector</dt>  <dt>If <var>ss</var> is an <abbr>ID</abbr> selector</dt>
360    <dd>Append a <code class=char>U+0023</code> <code class=charname>NUMBER    <dd>Append a <code class=char>U+0023</code> <code class=charname>NUMBER
361    SIGN</code> (<code class=char>#</code>) character, followed    SIGN</code> (<code class=char>#</code>) character, followed
362    by <span class=ed>@@ normalized</span> <abbr>ID</abbr>,    by <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
363    to <var>result</var>.</dd>    <abbr>ID</abbr>, to <var>result</var>.</dd>
364  <dt>If <var>ss</var> is a pseudo$B!>(Bclass selector</dt>  <dt>If <var>ss</var> is a pseudo$B!>(Bclass selector</dt>
365    <dd>    <dd>
366      <ol>      <ol>
367      <li>Append a <code class=char>U+003A</code>      <li>Append a <code class=char>U+003A</code>
368      <code class=charname>COLON</code> (<code class=char>:</code>) character      <code class=charname>COLON</code> (<code class=char>:</code>) character
369      to <var>result</var>.</li>      to <var>result</var>.</li>
370      <li>Append the <span class=ed>@@ normalized</span> name of the      <li>Append the
371      pseudo$B!>(Bclass to <var>result</var>.</li>      <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
372        name of the pseudo$B!>(Bclass to <var>result</var>.</li>
373      <li>Append any arguments as following:      <li>Append any arguments as following:
374        <dl class=switch>        <dl class=switch>
375        <dt>If the name of the pseudo$B!>(Bclass is <code>lang</code></dt>        <dt>If the name of the pseudo$B!>(Bclass is <code>lang</code></dt>
# Line 277  a simple selector (<dfn><var id=var-ss>s Line 378  a simple selector (<dfn><var id=var-ss>s
378            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT
379            PARENTHESIS</code> (<code class=char>(</code>) character            PARENTHESIS</code> (<code class=char>(</code>) character
380            to <var>result</var>.</li>            to <var>result</var>.</li>
381            <li>Append <span class=ed>@@ normalized</span>            <li>Append the
382              <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
383            language tag (the argument) to <var>result</var>.</li>            language tag (the argument) to <var>result</var>.</li>
384            <li>Append a <code class=char>U+0029</code>            <li>Append a <code class=char>U+0029</code>
385            <code class=charname>RIGHT PARENTHESIS</code>            <code class=charname>RIGHT PARENTHESIS</code>
# Line 292  a simple selector (<dfn><var id=var-ss>s Line 394  a simple selector (<dfn><var id=var-ss>s
394            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT
395            PARENTHESIS</code> (<code class=char>(</code>) character            PARENTHESIS</code> (<code class=char>(</code>) character
396            to <var>result</var>.</li>            to <var>result</var>.</li>
397            <li>Append <span class=ed>@@ normalized</span>            <li>Append the
398              <a href="#algorithm-normalize-a-string" title="normalize a string">normalized</a>
399            string (the argument) to <var>result</var>.</li>            string (the argument) to <var>result</var>.</li>
400            <li>Append a <code class=char>U+0029</code>            <li>Append a <code class=char>U+0029</code>
401            <code class=charname>RIGHT PARENTHESIS</code>            <code class=charname>RIGHT PARENTHESIS</code>
# Line 384  a simple selector (<dfn><var id=var-ss>s Line 487  a simple selector (<dfn><var id=var-ss>s
487      <li>Append two <code class=char>U+003A</code>      <li>Append two <code class=char>U+003A</code>
488      <code class=charname>COLON</code> characters (<code>::</code>)      <code class=charname>COLON</code> characters (<code>::</code>)
489      to <var>result</var>.</li>      to <var>result</var>.</li>
490      <li>Append the <span class=ed>@@ normalized</span> name of the      <li>Append the
491      pseudo$B!>(Belement to <var>result</var>.</li>      <a href="#algorithm-normalize-an-ident" title="normalize an IDENT">normalized</a>
492        name of the pseudo$B!>(Belement to <var>result</var>.</li>
493      <!-- For future version: append "(", arguments, ")", if any. -->      <!-- For future version: append "(", arguments, ")", if any. -->
494      </ol>      </ol>
495    </dd>    </dd>
496  </dl>  </dl>
497    
498    </div>
499    
500  <p>A <dfn id=newline title=newline>newline</dfn>  <div class=section id=serializing-groups-of-selectors>
501  <em class=rfc2119>SHOULD</em> be represented as a  <h3>Serializing Groups of Selectors</h3>
502  <code class=char>U+000A</code> <code class=charname>LINE FEED</code>  
503  character.  However, depending on the context where  <p>No <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
504  the <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  representation is defined for an invalid group of selectors.</p>
 representation is in use, a sequence of  
 <code class=char>U+000D</code> <code class=charname>CARRIAGE RETURN</code>  
 followed by a <code class=char>U+000A</code>  
 <code class=charname>LINE FEED</code> or a character  
 <code class=char>U+000D</code> <code class=charname>CARRIAGE RETURN</code>  
 <em class=rfc2119>MAY</em> be used as a newline instead.</p>  
505    
506  <div class="note memo">  <div class="note memo">
507  <p>Therefore, when  <p>The serialized representation will not contain any comment.</p>
508    </div>
509    
510    <!-- TODO: link terms to Selectors -->
511    
512    <p>To
513    <dfn id=algorithm-serialize-a-group-of-selectors title="serialize a group of selectors">serialize
514    a group of selectors (<dfn id=var-gs><var>gs</var></dfn>)</dfn>:</p>
515    <ol>
516    <li>Let <dfn id=var-result><var>result</var></dfn> an empty string.</li>
517    <li>For each selector (<dfn id=var-selector><var>selector</var></dfn>) in
518    <var>gs</var>:
519      <ol>
520      <li>If <var>selector</var> is <em>not</em> the first selector
521      in the group of selectors, then append a <code class=char>U+002C</code>
522      <code class=charname>COMMA</code> (<code class=char>,</code>) followed by a
523      <a href="#newline">newline</a> to <var>result</var>.</li>
524      <li>Append four <code class=char>U+0020</code>
525      <code class=charname>SPACE</code> characters to <var>result</var>.</li>
526      <li>Process each sequence of simple selectors or
527      combinator in <var>selector</var> by following algorithm:
528        <dl class=switch>
529        <dt>If it is a sequence of simle selector
530        (<dfn id=var-sss><var>sss</var></dfn>)</dt>
531          <dd>
532            <ol>
533            <li class=ed><a href="#algorithm-serialize-a-simple-selector">Serialize
534            each simple selector</a> in <var>sss</var>.</li>
535            <li class=ed>sort</li>
536            <li>Append a <a href="#newline">newline</a> to <var>result</var>.</li>
537            </ol>
538          </dd>
539        <dt>If it is a combinator (<dfn id=var-c><var>c</var></dfn>)</dt>
540          <dd>
541            <ol>
542            <li>Append two <code class=char>U+0020</code>
543            <code class=charname>SPACE</code> characters to <var>result</var>.</li>
544            <li>
545              <dl class=switch>
546              <dt>If <var>c</var> is descendant combinator (white space)</dt>
547                <dd>Append a <code class=char>U+0020</code>
548                <code class=charname>SPACE</code> character to
549                <var>result</var>.</dd>
550              <dt>If <var>c</var> is child combinator
551              (<code class=char>></code>)</dt>
552                <dd>Append a <code class=char>U+003E</code>
553                <code class=charname>GREATER-THAN SIGN</code>
554                (<code class=char>></code>) character to <var>result</var>.</dd>
555              <dt>If <var>c</var> is adjacent sibling combinator
556              (<code class=char>+</code>)</dt>
557                <dd>Append a <code class=char>U+002B</code>
558                <code class=charname>PLUS SIGN</code> (<code class=char>+</code>)
559                character to <var>result</var>.</dd>
560              <dt>If <var>c</var> is general sibling combinator
561              (<code class=char>~</code>)</dt>
562                <dd>Append a <code class=char>U+007E</code>
563                <code class=charname>TILDE</code> (<code class=char>~</code>)
564                character to <var>result</var>.</dd>
565              </dl>
566            </li>
567            <li>Append a <code class=char>U+0020</code>
568            <code class=charname>SPACE</code> character to
569            <var>result</var>.</li>
570            </ol>
571          </dd>
572        </dl>
573      </ol>
574    </li>
575    <li>Then, <var>result</var> is the
576  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
577  representations are literally compared, newlines must be normalized.</p>  representation of <var>gs</var>.</li>
578    </ol>
579    
580  </div>  </div>
581    
582  </div>  </div>
# Line 504  by choosing <q>Selectors</q> radio butto Line 673  by choosing <q>Selectors</q> radio butto
673    <code class=URI>&lt;<a href="http://dev.w3.org/2006/webapi/selectors-api/Overview.html">http://dev.w3.org/2006/webapi/selectors-api/Overview.html</a>></code>.    <code class=URI>&lt;<a href="http://dev.w3.org/2006/webapi/selectors-api/Overview.html">http://dev.w3.org/2006/webapi/selectors-api/Overview.html</a>></code>.
674    The latest published version of the specification is available at    The latest published version of the specification is available at
675    <code class=URI>&lt;<a href="http://www.w3.org/TR/selectors-api/">http://www.w3.org/TR/selectors-api/</a>></code>.</dd>    <code class=URI>&lt;<a href="http://www.w3.org/TR/selectors-api/">http://www.w3.org/TR/selectors-api/</a>></code>.</dd>
676  <dt id=XBL2>XBL2</dt>  <dt id=ref-XBL2>XBL2</dt>
677    <dd><cite><a href="http://www.mozilla.org/projects/xbl/xbl2.html"><abbr>XBL</abbr>    <dd><cite><a href="http://www.mozilla.org/projects/xbl/xbl2.html"><abbr>XBL</abbr>
678    2.0</a></cite>, Mozilla.org, <time datetime=2007-03-15>15 Mar 2007</time>.    2.0</a></cite>, Mozilla.org, <time datetime=2007-03-15>15 Mar 2007</time>.
679    Work in progress.  The latest    Work in progress.  The latest
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