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revision 1.9 by wakaba, Mon Oct 15 00:52:18 2007 UTC revision 1.26 by wakaba, Mon Nov 5 11:37:27 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>First Edition <!-- Working Draft -->
14    <time datetime=2007-11-05>5 November 2007</time></h2>
15    
16  <dl class="versions-uri">  <dl class="versions-uri">
17  <dt>This Version</dt>  <dt>This Version</dt>
18    <dd><code class="URI">&lt;<a href="http://suika.fam.cx/www/markup/selectors/ssft/ssft"    <dd><code class="URI">&lt;<a href="http://suika.fam.cx/www/markup/selectors/ssft/ssft-20071105"
19        >http://suika.fam.cx/www/markup/selectors/ssft/ssft</a>&gt;</code></dd>        >http://suika.fam.cx/www/markup/selectors/ssft/ssft-20071105</a>&gt;</code></dd>
20  <dt>Latest Version</dt>  <dt>Latest Version</dt>
21    <dd><code class="URI">&lt;<a href="http://suika.fam.cx/www/markup/selectors/ssft/ssft"    <dd><code class="URI">&lt;<a href="http://suika.fam.cx/www/markup/selectors/ssft/ssft"
22        >http://suika.fam.cx/www/markup/selectors/ssft/ssft</a>&gt;</code></dd>        >http://suika.fam.cx/www/markup/selectors/ssft/ssft</a>&gt;</code></dd>
 <!--  
23  <dt>Latest Working Draft</dt>  <dt>Latest Working Draft</dt>
24  -->    <dd><code class="URI">&lt;<a href="http://suika.fam.cx/www/markup/selectors/ssft/ssft-work"
25          >http://suika.fam.cx/www/markup/selectors/ssft/ssft-work</a>&gt;</code></dd>
26  <!-- <dt>Previous Version</dt> -->  <!-- <dt>Previous Version</dt> -->
27  <dt>Version History</dt>  <dt>Version History</dt>
28    <dd><code class=URI>&lt;<a href="http://suika.fam.cx/gate/cvs/markup/selectors/ssft/ssft.en.html">http://suika.fam.cx/gate/cvs/markup/selectors/ssft/ssft.en.html</a>&gt;</code></dd>    <dd><code class=URI>&lt;<a href="http://suika.fam.cx/gate/cvs/markup/selectors/ssft/ssft-work.en.html">http://suika.fam.cx/gate/cvs/markup/selectors/ssft/ssft-work.en.html</a>&gt;</code></dd>
29  </dl>  </dl>
30  <dl class="authors" id="author">  <dl class="authors" id="author">
31  <dt>Author</dt>  <dt>Author</dt>
# Line 52  available at <code class="URI">&lt;<a Line 53  available at <code class="URI">&lt;<a
53  <div id="abstract" class="section">  <div id="abstract" class="section">
54  <h2>Abstract</h2>  <h2>Abstract</h2>
55    
56  <div class="ed issue">...</div>  <p>This document defines
57    <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>,
58    a subset of Selectors language which is suitable for describing results
59    of Selectors parsing tests.</p>
60    
61  </div>  </div>
62    
# Line 63  available at <code class="URI">&lt;<a Line 67  available at <code class="URI">&lt;<a
67  at the time of its publication.  Other documents  at the time of its publication.  Other documents
68  might supersede this document.</em></p>  might supersede this document.</em></p>
69    
70  <p>This document is a working draft, produced as part  <p>This document is the specification
71    <!-- This document is a working draft -->
72    of <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>,
73    produced as part of the
74    <a href="http://suika.fam.cx/www/markup/html/whatpm/readme">Whatpm</a>
75    subproject
76  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>
77  project.  It might be updated, replaced, or obsoleted by  project.
78    <!-- It might be updated, replaced, or obsoleted by
79  other documents at any time.  It is inappropriate to  other documents at any time.  It is inappropriate to
80  cite this document as other than <q>work in progress</q>.</p>  cite this document as other than <q>work in progress</q>. --></p>
81    
82  <p>Comments on this document are welcome and  <p>Comments on this document are welcome and
83  may be sent to the <a href="#author">author</a>.</p>  may be sent to the <a href="#author">author</a>.</p>
# Line 96  in a tree structure and are used in Web Line 106  in a tree structure and are used in Web
106  <abbr>API</abbr></a>  <abbr>API</abbr></a>
107  <cite class="bibref informative">[<a href="#ref-SAPI">SAPI</a>]</cite>.</p>  <cite class="bibref informative">[<a href="#ref-SAPI">SAPI</a>]</cite>.</p>
108    
109  <div class="issue ed">...</div>  <p>It is so flexible language that a conceptually same pattern
110    can be represented in inifnite numbers of instances of selectors.
111    It might be convinient for e.g. validation of a test result to
112    define a subset of the language, in which no semantically equivalent
113    selectors are contained.</p>
114    
115  <p><a href="http://dev.w3.org/cvsweb/csswg/cssom/Overview.html">The  <p><a href="http://dev.w3.org/cvsweb/csswg/cssom/Overview.html">The
116  <abbr title="Cascading Style Sheets Object Model">CSSOM</abbr>  <abbr title="Cascading Style Sheets Object Model">CSSOM</abbr>
# Line 109  attribute.  However, the algorithm is in Line 123  attribute.  However, the algorithm is in
123  <time datetime=2007-09-25>at the time of the writing</time>.    <time datetime=2007-09-25>at the time of the writing</time>.  
124  Note that current Web browser implementations  Note that current Web browser implementations
125  of the <code>selectorText</code> attribute are consistently broken  of the <code>selectorText</code> attribute are consistently broken
126  in not escaping unsafe identifiers.</p>  in not escaping unsafe identifiers and therefore it is not wise
127    to deploy that format for testing.</p>
128    
129  </div>  </div>
130    
131  <div class="section" id="terminology">  <div class="section" id="terminology">
132  <h2>Terminology</h2>  <h2>Terminology</h2>
133    
134  <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>,
135  <q><em class="rfc2119">MUST NOT</em></q>,  <q><dfn id=must-not><em class="rfc2119">MUST NOT</em></dfn></q>,
136  <q><em class="rfc2119">SHOULD</em></q>,  <q><dfn id=should><em class="rfc2119">SHOULD</em></dfn></q>, and
137  <q><em class="rfc2119">SHOULD NOT</em></q>, and  <q><dfn id=may><em class=rfc2119>MAY</em></dfn></q> in this
 <q><em class=rfc2119>MAY</em></q> in this  
138  document are to be interpreted as described in  document are to be interpreted as described in
139  <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>
140  2119</a>  2119</a>
141  <cite class="bibref normative">[<a href="#ref-KEYWORDS">KEYWORDS</a>]</cite>.</p>  <cite class="bibref normative">[<a href="#ref-KEYWORDS">KEYWORDS</a>]</cite>.</p>
142    
143    <p>Requirements phrased in the imperative as part of algorithms are to be
144    interpreted with the meaning of the key word (<em class=rfc2119>MUST</em>)
145    used in introducing the algorithm.</p>
146    
147    <p>Conformance requirements phrased as algorithms or specific steps
148    <em class=rfc2119>MAY</em> be implemented in any manner, so long as the end
149    result is equivalent.</p>
150    
151  <!-- Strictly speaking the paragraph below is not part of terminology. -->  <!-- Strictly speaking the paragraph below is not part of terminology. -->
152  <p>All examples and notes in this specification are non$B!>(Bnormative,  <p>All examples and notes in this specification are non$B!>(Bnormative,
153  as are all sections explicitly marked non$B!>(Bnormative.  Everything  as are all sections explicitly marked non$B!>(Bnormative.  Everything
# Line 138  simple selector in a selector.</p> Line 160  simple selector in a selector.</p>
160  </div>  </div>
161    
162  <div class="section" id="serializing">  <div class="section" id="serializing">
163  <h2>Serializing Groups of Selectors</h2>  <h2>Serializing Selectors in
164    <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
165    Representation</h2>
166    
167  <div class="issue ed">  <p>Subsections of this section define algorithms
168  <p><a href="http://suika.fam.cx/gate/cvs/*checkout*/markup/html/whatpm/Whatpm/CSS/SelectorsSerializer.pm">See the reference implementation</a>  to <a href="#algorithm-serialize-a-simple-selector">serialize a simple
169  for now.</p>  selector</a> or <a href="#algorithm-serialize-a-group-of-selectors">serialize
170  </div>  a group of selectors</a>.</p>
   
 <p>No <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  
 representation is defined for an invalid group of selectors.</p>  
171    
172  <div class="note memo">  <div class="note memo">
173  <p>The serialized representation will not contain any comment.</p>  <p>The serialized representation will not contain any comment.</p>
174  </div>  </div>
175    
176  <!-- TODO: link terms to Selectors -->  <div class=section id=serializing-tokens>
177    <h3>Serializing Tokens</h3>
178    
179  <p>To  <p>To <dfn id=algorithm-normalize-an-ident title="normalize a string as an IDENT">normalize
180  <dfn id=algorithm-serialize-a-group-of-selectors title="serialize a group of selectors">serialize  a string (<dfn id=var-n><var>n</var></dfn>) as an <code>IDENT</code></dfn>,
181  a group of selectors (<dfn id=var-gs><var>gs</var></dfn>)</dfn>:</p>  the following algorithm <em class=rfc2119>MUST</em> be used:</p>
182  <ol>  <ol>
183  <li>Let <dfn id=var-result><var>result</var></dfn> an empty string.</li>  <li>If <var>n</var> is either an <code>IDENT</code> or a <code>HASH</code>,
184  <li>For each selector (<dfn id=var-selector><var>selector</var></dfn>) in  replace the escape sequences (<code>\</code> and following characters) in
185  <var>gs</var>:  <var>n</var> by characters represented by them respectively.</li>
186    <ol>  <li>If <var>n</var> is a <code>HASH</code>, remove the leading
187    <li>If <var>selector</var> is <em>not</em> the first selector  <code class=char>U+0023</code> <code class=charname>NUMBER SIGN</code>
188    in the group of selectors, then append a <code class=char>U+002C</code>  (<code class=char>#</code>) character from <var>n</var>.</li>
189    <code class=charname>COMMA</code> (<code class=char>,</code>) followed by a  <li>If there is any character that is <em>not</em> one of
190    <a href="#newline">newline</a> to <var>result</var>.</li>  <code class=char>U+002D</code> <code class=charname>HYPHEN-MINUS</code>
191    <li>Append four <code class=char>U+0020</code>  (<code class=char>-</code>), <code class=char>U+0030</code>
192    <code class=charname>SPACE</code> characters to <var>result</var>.</li>  <code class=charname>DIGIT ZERO</code>
193    <li>Process each sequence of simple selectors or  (<code class=char>0</code>) to <code class=char>U+0039</code>
194    combinator in <var>selector</var> by following algorithm:  <code class=charname>DIGIT NINE</code> (<code class=char>9</code>),
195      <dl class=switch>  <code class=char>U+0041</code> <code class=charname>LATIN CAPITAL LETTER
196      <dt>If it is a sequence of simle selector  A</code> (<code class=char>A</code>) to <code class=char>U+005A</code>
197      (<dfn id=var-sss><var>sss</var></dfn>)</dt>  <code class=charname>LATIN CAPITAL LETTER Z</code> (<code class=char>Z</code>),
198        <dd>  <code class=char>U+005F</code> <code class=charname>LOW LINE</code>
199          <ol>  (<code class=char>_</code>), <code class=char>U+0061</code>
200          <li class=ed><a href="#algorithm-serialize-a-simple-selector">Serialize  <code class=charname>LATIN SMALL LETTER A</code>
201          each simple selector</a> in <var>sss</var>.</li>  (<code class=char>a</code>) to <code class=char>U+006A</code>
202          <li class=ed>sort</li>  <code class=charname>LATIN SMALL LETTER Z</code> (<code class=char>z</code>),
203          <li>Append a <a href="#newline">newline</a> to <var>result</var>.</li>  <code class=char>U+0080</code> to <code class=char>U+D7FF</code>, or
204          </ol>  <code class=char>U+E000</code> to <code class=char>U+10FFFF</code> in
205        </dd>  <var>n</var>, then replace it by string <code>\<var>HHHHHH</var></code>, where
206      <dt>If it is a combinator (<dfn id=var-c><var>c</var></dfn>)</dt>  <dfn id=var-ident-HHHHHH><var>HHHHHH</var></dfn> is the uppercase
207        <dd>  zero$B!>(Bpadded hexadecimal representation of the character.  If the character
208          <ol>  is outside the range of <code>[<code class=char>U+0000</code>,
209          <li>Append two <code class=char>U+0020</code>  <code class=char>U+10FFFF</code>]</code>, <var>HHHHHH</var>
210          <code class=charname>SPACE</code> characters to <var>result</var>.</li>  <em class=rfc2119>MUST</em> be <code>FFFFFF</code>.</li>
211          <li>  <li>If the first character in <var>n</var> is one of
212            <dl class=switch>  <code class=char>U+0030</code> <code class=charname>DIGIT ZERO</code>
213            <dt>If <var>c</var> is descendant combinator (white space)</dt>  (<code class=char>0</code>) to <code class=char>U+0039</code>
214              <dd>Append a <code class=char>U+0020</code>  <code class=charname>DIGIT NINE</code> (<code class=char>9</code>),
215              <code class=charname>SPACE</code> character to  then prepend a string <code>\00003</code> at the beginning of
216              <var>result</var>.</dd>  <var>n</var>.</li>
217            <dt>If <var>c</var> is child combinator  <li>If the first character in <var>n</var> is <code class=char>U+002D</code>
218            (<code class=char>></code>)</dt>  <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>) and
219              <dd>Append a <code class=char>U+003E</code>  the second character, if any, is <em>not</em> one of
220              <code class=charname>GREATER-THAN SIGN</code>  <code class=char>U+0041</code> <code class=charname>LATIN CAPITAL LETTER
221              (<code class=char>></code>) character to <var>result</var>.</dd>  A</code> (<code class=char>A</code>) to <code class=char>U+005A</code>
222            <dt>If <var>c</var> is adjacent sibling combinator  <code class=charname>LATIN CAPITAL LETTER Z</code> (<code class=char>Z</code>),
223            (<code class=char>+</code>)</dt>  <code class=char>U+005F</code> <code class=charname>LOW LINE</code>
224              <dd>Append a <code class=char>U+002B</code>  (<code class=char>_</code>), <code class=char>U+0061</code>
225              <code class=charname>PLUS SIGN</code> (<code class=char>+</code>)  <code class=charname>LATIN SMALL LETTER A</code>
226              character to <var>result</var>.</dd>  (<code class=char>a</code>) to <code class=char>U+006A</code>
227            <dt>If <var>c</var> is general sibling combinator  <code class=charname>LATIN SMALL LETTER Z</code> (<code class=char>z</code>),
228            (<code class=char>~</code>)</dt>  <code>U+0080</code> to <code>U+D7FF</code>, or
229              <dd>Append a <code class=char>U+007E</code>  <code>U+E000</code> to <code>U+10FFFF</code>, or
230              <code class=charname>TILDE</code> (<code class=char>~</code>)  <var>n</var> is equal to <code class=char>U+002D</code>
231              character to <var>result</var>.</dd>  <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>), then
232            </dl>  replace the <code class=char>U+002D</code>
233          </li>  <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>)
234          <li>Append a <code class=char>U+0020</code>  character by string <code>\00002D</code>.</li>
235          <code class=charname>SPACE</code> character to  <li>Then, <var>n</var> is the result of the algorithm.</li>
236          <var>result</var>.</li>  </ol>
237          </ol>  
238        </dd>  <p>To <dfn id=algorithm-normalize-a-string title="normalize a string (STRING or IDENT) as a STRING">normalize
239      </dl>  a string (<dfn id=var-s><var>s</var></dfn>) as a <code>STRING</code></dfn>,
240    </ol>  the following algorithm <em class=rfc2119>MUST</em> be used:</p>
241  </li>  <ol>
242  <li>Then, <var>result</var> is the  <li>If <var>s</var> is either an <code>IDENT</code> or a
243    <code>STRING</code>, replace the escape sequences (<code>\</code> and
244    following characters) in <var>s</var> by characters represented by them
245    (or an empty string if <code>\</code> is immediately followed by
246    newline character(s)) respectively.</li>
247    <li>If <var>s</var> is a <code>STRING</code>, remove the quotation marks
248    enclosing <var>s</var>.</li>
249    <li><p>If there is any character that is <em>not</em> one of
250    <code class=char>U+0020</code> <code class=charname>SPACE</code>,
251    <code class=char>U+0021</code> <code class=charname>EXCLAMATION MARK</code>
252    (<code class=char>!</code>), <code class=char>U+0023</code>
253    <code class=charname>NUMBER SIGN</code> (<code class=char>#</code>) to
254    <code class=char>U+005B</code> <code class=charname>LEFT SQUARE
255    BRACKET</code>, <code class=char>U+005D</code> <code class=charname>RIGHT
256    SQUARE BRACKET</code> to <code class=char>U+D7FF</code>, or
257    <code class=char>U+E000</code> to <code class=char>U+10FFFF</code> in
258    <var>s</var>, then replace it by string <code>\<var>HHHHHH</var></code>, where
259    <dfn id=var-string-HHHHHH><var>HHHHHH</var></dfn> is the uppercase
260    zero$B!>(Bpadded hexadecimal representation of the character.  If the character
261    is outside the range of <code>[<code class=char>U+0000</code>,
262    <code class=char>U+10FFFF</code>]</code>, <var>HHHHHH</var>
263    <em class=rfc2119>MUST</em> be <code>FFFFFF</code>.</p></li>
264    <li><p>Insert a <code class=char>U+0022</code> <code class=charname>QUOTATION
265    MARK</code> (<code class=char>"</code>) at the beginning of
266    <var>s</var>.</p></li>
267    <li><p>Insert a <code class=char>U+0022</code> <code class=charname>QUOTATION
268    MARK</code> (<code class=char>"</code>) at the end of <var>s</var>.</p></li>
269    <li><p>Then, <var>s</var> is the result of the algorithm.</p></li>
270    </ol>
271    
272    <p>A <dfn id=newline title=newline>newline</dfn>
273    <em class=rfc2119>SHOULD</em> be represented as a
274    <code class=char>U+000A</code> <code class=charname>LINE FEED</code>
275    character.  However, depending on the context where
276    the <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
277    representation is in use, a sequence of
278    <code class=char>U+000D</code> <code class=charname>CARRIAGE RETURN</code>
279    followed by a <code class=char>U+000A</code>
280    <code class=charname>LINE FEED</code> (i.e. a
281    <code>CRLF</code> sequence) or a character
282    <code class=char>U+000D</code> <code class=charname>CARRIAGE RETURN</code>
283    <em class=rfc2119>MAY</em> be used as a <a href="#newline">newline</a> instead.
284    <a href="#newline">Newline</a> representations
285    <em class=rfc2119>SHOULD</em> be consistent in an
286  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
287  representation of <var>gs</var>.</li>  representation.</p>
288    
289    <div class="note memo">
290    <p>Therefore, newlines must be normalized before
291    <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
292    representations are literally compared.</p>
293    </div>
294    
295    <div class="issue ed">
296    <p>In a future version of the specification, we need to define
297    <dfn id=lowercase>lowercase</dfn> (maybe by referencing some version of
298    some module of <abbr>CSS</abbr>).  It is <code>tr/A-Z/a-z/</code> for now.</p>
299    </div>
300    
301    <p>To
302    <dfn id=algorithm-normalize-an-integer title="normalize an integer">normalize
303    an integer (<dfn id=var-int-i><var>i</var></dfn>)</dfn>, the following
304    algorithm <em class=rfc2119>MUST</em> be used:</p>
305    <ol class=algorithm>
306    <li>If <var>i</var> is equal to zero (0), return a string with only a
307    character: <code class=char>U+0030</code>
308    <code class=charname>DIGIT ZERO</code> (<code class=char>0</code>).
309    Stop the algorithm.</li>
310    <li>Let <dfn id=var-int-result><var>result</var></dfn> be an empty string.</li>
311    <li>If <var>i</var> is less than zero (0), append a
312    <code class=char>U+002D</code> <code class=charname>HYPHEN-MINUS</code>
313    (<code class=char>-</code>) character to <var>result</var>.</li>
314    <li>Append the decimal representation of the absolute value of
315    <var>i</var> to <var>result</var>.  The decimal (base$B!>(Bten) representation
316    <em class=rfc2119>MUST NOT</em> begin with a <code class=char>U+0030</code>
317    <code class=charname>DIGIT ZERO</code> (<code class=char>0</code>)
318    character.</li>
319    <li>Return <var>result</var>.</li>
320  </ol>  </ol>
321    
322    </div>
323    
324    
325    <div class=section id=serializing-simple-selectors>
326    <h3>Serializing Simple Selectors</h3>
327    
328    <p>No <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
329    representation is defined for an invalid <a href="#simple-selector">simple
330    selector</a>.</p>
331    
332  <p>To  <p>To
333  <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
334  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>,
335    the following algorithm <em class=rfc2119>MUST</em> be used:</p>
336    <ol>
337    <li>Let <dfn id=var-r><var>r</var></dfn> an empty string.</li>
338    <li>Process <var>ss</var> as following:
339    
340  <dl class=switch>  <dl class=switch>
341  <dt>If <var>ss</var> is a type or universal selector</dt>  <dt>If <var>ss</var> is a type or universal selector</dt>
342    <dd>    <dd>
343      <ol>      <ol>
344      <li>      <li>Append a namespace prefix as following:
345    
346        <dl class=switch>        <dl class=switch>
347        <dt>If a namespace URI is specified (via namespace prefix, or        <dt>If a namespace URI is specified (via namespace prefix, or
348        by omitting namespace prefix where a default namespace is specified)</dt>        by omitting namespace prefix where a default namespace is specified)</dt>
349          <dd class="ed">@@</dd>          <dd>Append the namespace URI as a
350            <a href="#algorithm-normalize-an-ident" title="normalize a string as an IDENT">normalized
351            <code>IDENT</code></a> to <var>r</var>.  Then, append a
352            <code class=char>U+007C</code>
353            <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
354            character to <var>r</var>.</dd>
355        <dt>If the null namespace is specified (by zero$B!>(Blength namespace        <dt>If the null namespace is specified (by zero$B!>(Blength namespace
356        prefix)</dt>        prefix)</dt>
357          <dd>Append a <code class=char>U+007C</code>          <dd>Append a <code class=char>U+007C</code>
358          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
359          character to <var>result</var>.</dd>          character to <var>r</var>.</dd>
360        <dt>If no namespace is specified (by namespace prefix <code>*</code>,        <dt>If no namespace is specified (by namespace prefix <code>*</code>,
361        or by omitting namespace prefix where no default namespace is        or by omitting namespace prefix where no default namespace is
362        specified)</dt>        specified)</dt>
# Line 246  a simple selector (<dfn><var id=var-ss>s Line 364  a simple selector (<dfn><var id=var-ss>s
364          <code class=charname>ASTERISK</code> (<code class=char>*</code>)          <code class=charname>ASTERISK</code> (<code class=char>*</code>)
365          character, followed by a <code class=char>U+007C</code>          character, followed by a <code class=char>U+007C</code>
366          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
367          character, to <var>result</var>.</dd>          character, to <var>r</var>.</dd>
368        </dl>        </dl>
369      </li>      </li>
370      <li>If <var>ss</var> is a type selector, append the      <li>If <var>ss</var> is a type selector, append the
371      <span class=ed>@@ normalized</span> local name to <var>result</var>.</li>      <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) an IDENT">normalized</a>
372        local name to <var>r</var>.</li>
373      <li>If <var>ss</var> is a universal selector, append      <li>If <var>ss</var> is a universal selector, append
374      a <code class=char>U+002A</code> <code class=charname>ASTERISK</code>      a <code class=char>U+002A</code> <code class=charname>ASTERISK</code>
375      (<code class=char>*</code>) character to <var>result</var>.</li>      (<code class=char>*</code>) character to <var>r</var>.</li>
376      </ol>      </ol>
377    </dd>    </dd>
378  <dt>If <var>ss</var> is an attribute selector</dt>  <dt>If <var>ss</var> is an attribute selector</dt>
# Line 261  a simple selector (<dfn><var id=var-ss>s Line 380  a simple selector (<dfn><var id=var-ss>s
380      <ol>      <ol>
381      <li>Append a <code class=char>U+005B</code> <code class=charname>LEFT      <li>Append a <code class=char>U+005B</code> <code class=charname>LEFT
382      SQUARE BRACKET</code> (<code class=char>[</code>) to      SQUARE BRACKET</code> (<code class=char>[</code>) to
383      <var>result</var>.</li>      <var>r</var>.</li>
384      <li>      <li>
385        Append a namespace prefix as following:        Append a namespace prefix as following:
386        <dl>        <dl>
387        <dt>If a namespace URI is specified</dt>        <dt>If a namespace URI is specified</dt>
388          <dd class=ed>@@</dd>          <dd>Append the namespace URI as a
389          <dd class=ed>@@ Current reference implementation is wrong,          <a href="#algorithm-normalize-an-ident" title="normalize a string as an IDENT">normalized
390          since its result of sorting depends on namespace prefix.</dd>          <code>IDENT</code></a> to <var>r</var>.  Then, append a
391            <code class=char>U+007C</code>
392            <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
393            character to <var>r</var>.</dd>
394        <dt>If the null namespace is specified</dt>        <dt>If the null namespace is specified</dt>
395          <dd>Append a <code class=char>U+007C</code>          <dd>Append a <code class=char>U+007C</code>
396          <code class=charname>VERTICAL BAR</code> character to          <code class=charname>VERTICAL BAR</code> character to
397          <var>result</var>.</dd>          <var>r</var>.</dd>
398        <dt>If no namespace is specified</dt>        <dt>If no namespace is specified</dt>
399          <dd>Append a <code class=char>U+002A</code>          <dd>Append a <code class=char>U+002A</code>
400          <code class=charname>ASTERISK</code> (<code class=char>*</code>)          <code class=charname>ASTERISK</code> (<code class=char>*</code>)
401          character, followed by a <code class=char>U+007C</code>          character, followed by a <code class=char>U+007C</code>
402          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)          <code class=charname>VERTICAL BAR</code> (<code class=char>|</code>)
403          character, to <var>result</var>.</dd>          character, to <var>r</var>.</dd>
404        </dl>        </dl>
405      </li>      </li>
406      <li>Append the <span class=ed>@@ normalized</span> local name to      <li>Append the
407      <var>result</var>.</li>      <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
408        local name to <var>r</var>.</li>
409      <li>If a value is specified in <var>ss</var>:      <li>If a value is specified in <var>ss</var>:
410        <ol>        <ol>
411        <li>Depending on the way to match, append <code>=</code>,        <li>Depending on the way to match, append <code>=</code>,
412        <code>~=</code>, <code>|=</code>, <code>^=</code>,        <code>~=</code>, <code>|=</code>, <code>^=</code>,
413        <code>$=</code>, or <code>*=</code> to <var>result</var>.</li>        <code>$=</code>, or <code>*=</code> to <var>r</var>.</li>
414        <li>Append the <span class=ed>@@ normalized</span> value to        <li>Append the
415        <var>result</var>.</li>        <a href="#algorithm-normalize-a-string" title="normalize a string">normalized</a>
416          value to <var>r</var>.</li>
417        </ol>        </ol>
418      </li>      </li>
419      <li>Append a <code class=char>U+005D</code> <code class=charname>RIGHT      <li>Append a <code class=char>U+005D</code> <code class=charname>RIGHT
420      SQUARE BRACKET</code> (<code class=char>]</code>) to      SQUARE BRACKET</code> (<code class=char>]</code>) to
421      <var>result</var>.</li>      <var>r</var>.</li>
422      </ol>      </ol>
423    </dd>    </dd>
424  <dt>If <var>ss</var> is a class selector</dt>  <dt>If <var>ss</var> is a class selector</dt>
425    <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
426    STOP</code> (<code class=char>.</code>) character, followed    STOP</code> (<code class=char>.</code>) character, followed
427    by <span class=ed>@@ normalized</span> class name,    by <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
428    <var>result</var>.</dd>    class name, to <var>r</var>.</dd>
429  <dt>If <var>ss</var> is an <abbr>ID</abbr> selector</dt>  <dt>If <var>ss</var> is an <abbr>ID</abbr> selector</dt>
430    <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
431    SIGN</code> (<code class=char>#</code>) character, followed    SIGN</code> (<code class=char>#</code>) character, followed
432    by <span class=ed>@@ normalized</span> <abbr>ID</abbr>,    by <a href="#algorithm-normalize-an-ident" title="normalize a string (HASH except for the leading #) as an IDENT">normalized</a>
433    to <var>result</var>.</dd>    <abbr>ID</abbr>, to <var>r</var>.</dd>
434  <dt>If <var>ss</var> is a pseudo$B!>(Bclass selector</dt>  <dt>If <var>ss</var> is a pseudo$B!>(Bclass selector</dt>
435    <dd>    <dd>
436      <ol>      <ol>
437      <li>Append a <code class=char>U+003A</code>      <li>Append a <code class=char>U+003A</code>
438      <code class=charname>COLON</code> (<code class=char>:</code>) character      <code class=charname>COLON</code> (<code class=char>:</code>) character
439      to <var>result</var>.</li>      to <var>r</var>.</li>
440      <li>Append the <span class=ed>@@ normalized</span> name of the      <li>Append the
441      pseudo$B!>(Bclass to <var>result</var>.</li>      <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
442        name (in <a href="#lowercase">lowercase</a>) of the pseudo$B!>(Bclass to
443        <var>r</var>.</li>
444      <li>Append any arguments as following:      <li>Append any arguments as following:
445        <dl class=switch>        <dl class=switch>
446        <dt>If the name of the pseudo$B!>(Bclass is <code>lang</code></dt>        <dt>If the name of the pseudo$B!>(Bclass is <code>lang</code></dt>
# Line 322  a simple selector (<dfn><var id=var-ss>s Line 448  a simple selector (<dfn><var id=var-ss>s
448            <ol>            <ol>
449            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT
450            PARENTHESIS</code> (<code class=char>(</code>) character            PARENTHESIS</code> (<code class=char>(</code>) character
451            to <var>result</var>.</li>            to <var>r</var>.</li>
452            <li>Append <span class=ed>@@ normalized</span>            <li>Append the
453            language tag (the argument) to <var>result</var>.</li>            <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
454              language tag (the argument) to <var>r</var>.
455              <span class="issue ed">Should we normalize cases?</span></li>
456            <li>Append a <code class=char>U+0029</code>            <li>Append a <code class=char>U+0029</code>
457            <code class=charname>RIGHT PARENTHESIS</code>            <code class=charname>RIGHT PARENTHESIS</code>
458            (<code class=char>)</code>) character            (<code class=char>)</code>) character
459            to <var>result</var>.</li>            to <var>r</var>.</li>
460            </ol>            </ol>
461          </dd>          </dd>
462        <dt>If the name of the pseudo$B!>(Bclass is        <dt>If the name of the pseudo$B!>(Bclass is
# Line 337  a simple selector (<dfn><var id=var-ss>s Line 465  a simple selector (<dfn><var id=var-ss>s
465            <ol>            <ol>
466            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT            <li>Append a <code class=char>U+0028</code> <code class=charname>LEFT
467            PARENTHESIS</code> (<code class=char>(</code>) character            PARENTHESIS</code> (<code class=char>(</code>) character
468            to <var>result</var>.</li>            to <var>r</var>.</li>
469            <li>Append <span class=ed>@@ normalized</span>            <li>Append the
470            string (the argument) to <var>result</var>.</li>            <a href="#algorithm-normalize-a-string" title="normalize a string">normalized</a>
471              string (the argument) to <var>r</var>.</li>
472            <li>Append a <code class=char>U+0029</code>            <li>Append a <code class=char>U+0029</code>
473            <code class=charname>RIGHT PARENTHESIS</code>            <code class=charname>RIGHT PARENTHESIS</code>
474            (<code class=char>)</code>) character            (<code class=char>)</code>) character
475            to <var>result</var>.</li>            to <var>r</var>.</li>
476            </ol>            </ol>
477          </dd>          </dd>
478        <dt>If name of the pseudo$B!>(Bclass is either <code>nth-child</code>,        <dt>If name of the pseudo$B!>(Bclass is either <code>nth-child</code>,
# Line 353  a simple selector (<dfn><var id=var-ss>s Line 482  a simple selector (<dfn><var id=var-ss>s
482            <ol>            <ol>
483            <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
484            PARENTHESIS</code> (<code class=char>(</code>) character            PARENTHESIS</code> (<code class=char>(</code>) character
485            to <var>result</var>.</li>            to <var>r</var>.</li>
486            <li>Append <span class=ed>@@ normalized</span>            <li>Let <dfn id=var-a><var>a</var></dfn> be the <var>a</var>
487            integer <var>a</var> to <var>result</var>.            part of the argument.  If the argument is a keyword <code>odd</code>
488            If the argument is a keyword <code>odd</code> or <code>even</code>,            or <code>even</code>, then let <var>a</var> be <code>2</code>.
489            <var>a</var> is <code>2</code>.  If <var>a</var> and            If the <var>a</var> part with following <code>n</code> character
490            <code>n</code> is omitted, <var>a</var> is assumed as            is omitted, then let <var>a</var> be <code>0</code>.
491            <code>0</code>.  Otherwise, if <var>a</var> is omitted,            Otherwise, if only the <var>a</var> part is omitted, then
492            it is assumed as <code>1</code> (or <code>-1</code>,            let <var>a</var> be <code>1</code>.  Otherwise, if the <var>a</var>
493            if there is a <code class=char>U+002D</code>            part is <code>-</code>, then let <var>a</var> be
494            <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>)            <code>-1</code>.</li>
495            character).</li>            <li>Let <var>a</var> be the
496              <a href="#algorithm-normalize-an-integer" title="normalize an integer">normalized
497              string representation</a> of integer <var>a</var>.</li>
498              <li>Append <var>a</var> to <var>r</var>.</li>
499            <li>Append a <code class=char>U+006E</code>            <li>Append a <code class=char>U+006E</code>
500            <code class=charname>LATIN SMALL LETTER N</code>            <code class=charname>LATIN SMALL LETTER N</code>
501            (<code class=char>n</code>) character to <var>result</var>.</li>            (<code class=char>n</code>) character to <var>r</var>.</li>
502            <li>Append <span class=ed>@@ normalized</span>            <li>Let <dfn id=var-b><var>b</var></dfn> be the <var>b</var>
503            integer <var>b</var> to <var>result</var>.            part of the argument.  If the argument is a keyword <code>odd</code>,
504            It <em class=rfc2119>MUST</em> be preceded by a sign,            then let <var>b</var> be <code>1</code>.  If the argument is a
505            either <code class=char>U+002B</code> <code class=charname>PLUS            keyword <code>even</code>, then let <var>b</var> be <code>0</code>.
506            SIGN</code> (<code class=char>+</code>) or            If the <var>b</var> part is omitted, then let <var>b</var> be
507            <code class=char>U+002D</code>            <code>0</code>.</li>
508              <li>Let <var>b</var> be the
509              <a href="#algorithm-normalize-an-integer" title="normalize an integer">normalized
510              string representation</a> of integer <var>b</var>.</li>
511              <li>If <var>b</var> does <em>not</em> start with a
512              <code class=char>U+002D</code>
513            <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>)            <code class=charname>HYPHEN-MINUS</code> (<code class=char>-</code>)
514            character.  If the argument is a keyword <code>odd</code>,            character, then append <code class=char>U+002B</code>
515            <var>b</var> is <code>1</code>.  If the argument            <code class=charname>PLUS SIGN</code>
516            is a keyword <code>even</code>, <var>b</var> is            (<code class=char>+</code>) to <var>r</var>.</li>
517            <code>0</code>.  If <var>b</var> is omitted, it is assumed as            <li>Append <var>b</var> to <var>r</var>.</li>
           <code>0</code>.  The sign of <code>0</code>  
           <em class=rfc2119>MUST</em> be <code class=char>U+002B</code>  
           <code class=charname>PLUS SIGN</code>  
           (<code class=char>+</code>).</li>  
518            <li>Append a <code class=char>U+0029</code>            <li>Append a <code class=char>U+0029</code>
519            <code class=charname>RIGHT PARENTHESIS</code>            <code class=charname>RIGHT PARENTHESIS</code>
520            (<code class=char>)</code>) character            (<code class=char>)</code>) character
521            to <var>result</var>.</li>            to <var>r</var>.</li>
522            </ol>            </ol>
523          </dd>          </dd>
524        <dt>If the name of the pseudo$B!>(Bclass is <code>not</code></dt>        <dt>If the name of the pseudo$B!>(Bclass is <code>not</code></dt>
# Line 399  a simple selector (<dfn><var id=var-ss>s Line 532  a simple selector (<dfn><var id=var-ss>s
532              <code class=charname>LATIN SMALL LETTER T</code>, and              <code class=charname>LATIN SMALL LETTER T</code>, and
533              <code class=char>U+0028</code> <code class=charname>LEFT              <code class=char>U+0028</code> <code class=charname>LEFT
534              PARENTHESIS</code> (<code>:not(</code>), followed by a              PARENTHESIS</code> (<code>:not(</code>), followed by a
535              <a href="#newline">newline</a>, to <var>result</var>.</li>              <a href="#newline">newline</a>, to <var>r</var>.</li>
536              <li>Append four <code class=char>U+0020</code>              <li>Append four <code class=char>U+0020</code>
537              <code class=charname>SPACE</code> characters to              <code class=charname>SPACE</code> characters to
538              <var>result</var>.</li>              <var>r</var>.</li>
539              <li>Append four <code class=char>U+0020</code>              <li>Append four <code class=char>U+0020</code>
540              <code class=charname>SPACE</code> characters to              <code class=charname>SPACE</code> characters to
541              <var>result</var> again.</li>              <var>r</var> again.</li>
542              <li><a href="#algorithm-serialize-a-simple-selector">Serialize              <li><a href="#algorithm-serialize-a-simple-selector">Serialize
543              the simple selector specified as the argument to the              the simple selector specified as the argument to the
544              <code>not</code> pseudo$B!>(Bclass</a>.</li>              <code>not</code> pseudo$B!>(Bclass</a>.</li>
545              <li>Append a <a href="#newline">newline</a> to              <li>Append a <a href="#newline">newline</a> to
546              <var>result</var>.</li>              <var>r</var>.</li>
547              <li>Append four <code class=char>U+0020</code>              <li>Append four <code class=char>U+0020</code>
548              <code class=charname>SPACE</code> characters to              <code class=charname>SPACE</code> characters to
549              <var>result</var>.</li>              <var>r</var>.</li>
550              <li>Append a <code class=char>U+0029</code>              <li>Append a <code class=char>U+0029</code>
551              <code class=charname>RIGHT PARENTHESIS</code>              <code class=charname>RIGHT PARENTHESIS</code>
552              (<code class=char>)</code>) character              (<code class=char>)</code>) character
553              to <var>result</var>.</li>              to <var>r</var>.</li>
554            </ol>            </ol>
555          </dd>          </dd>
556          <dt>Otherwise</dt>
557            <dd>The pseudo$B!>(Bclass is not supported by this version of
558            <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
559            and therefore no
560            <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
561            representation is defined for <var>ss</var>.  Stop the algorithm.</dd>
562        </dl>        </dl>
563      </li>      </li>
564      </ol>      </ol>
# Line 429  a simple selector (<dfn><var id=var-ss>s Line 568  a simple selector (<dfn><var id=var-ss>s
568      <ol>      <ol>
569      <li>Append two <code class=char>U+003A</code>      <li>Append two <code class=char>U+003A</code>
570      <code class=charname>COLON</code> characters (<code>::</code>)      <code class=charname>COLON</code> characters (<code>::</code>)
571      to <var>result</var>.</li>      to <var>r</var>.</li>
572      <li>Append the <span class=ed>@@ normalized</span> name of the      <li>Append the
573      pseudo$B!>(Belement to <var>result</var>.</li>      <a href="#algorithm-normalize-an-ident" title="normalize a string (IDENT) as an IDENT">normalized</a>
574      <!-- For future version: append "(", arguments, ")", if any. -->      name (in <a href="#lowercase">lowercase</a>) of the pseudo$B!>(Belement
575        to <var>r</var>.</li>
576        <li>If the pseudo$B!>(Belement has any arguments:
577            The pseudo$B!>(Belement is not supported by this version of
578            <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
579            and therefore no
580            <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
581            representation is defined for <var>ss</var>.  Stop the algorithm.
582        </li>
583      </ol>      </ol>
584    </dd>    </dd>
585  </dl>  </dl>
586    </li>
587    <li>Then, <var>r</var> is the
588    <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
589    representation of <var>ss</var>.</li>
590    </ol>
591    
592    </div>
593    
594  <p>A <dfn id=newline title=newline>newline</dfn>  <div class=section id=serializing-groups-of-selectors>
595  <em class=rfc2119>SHOULD</em> be represented as a  <h3>Serializing Groups of Selectors</h3>
 <code class=char>U+000A</code> <code class=charname>LINE FEED</code>  
 character.  However, depending on the context where  
 the <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  
 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> (i.e. a  
 <code>CRLF</code> sequence) or a character  
 <code class=char>U+000D</code> <code class=charname>CARRIAGE RETURN</code>  
 <em class=rfc2119>MAY</em> be used as a <a href="#newline">newline</a> instead.  
 <a href="#newline">Newline</a> representations  
 <em class=rfc2119>SHOULD</em> be consistent in an  
 <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  
 representation.</p>  
596    
597  <div class="note memo">  <p>No <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
598  <p>Therefore, newlines must be normalized before  representation is defined for an invalid
599    <a href="http://www.w3.org/TR/css3-selectors/#grouping">group of
600    selectors</a>.</p>
601    
602    <p>To
603    <dfn id=algorithm-serialize-a-group-of-selectors title="serialize a group of selectors">serialize
604    a group of selectors (<dfn id=var-gs><var>gs</var></dfn>)</dfn>,
605    the following algorithm <em class=rfc2119>MUST</em> be used:</p>
606    <ol>
607    <li>Let <dfn id=var-result><var>result</var></dfn> an empty string.</li>
608    <li>For each selector (<dfn id=var-selector><var>selector</var></dfn>) in
609    <var>gs</var>:
610      <ol>
611      <li>If <var>selector</var> is <em>not</em> the first selector
612      in the <var>gs</var>, then append a <code class=char>U+002C</code>
613      <code class=charname>COMMA</code> (<code class=char>,</code>) followed by a
614      <a href="#newline">newline</a> to <var>result</var>.</li>
615      <li>Append four <code class=char>U+0020</code>
616      <code class=charname>SPACE</code> characters to <var>result</var>.</li>
617      <li>Process each sequence of simple selectors or
618      combinator in <var>selector</var> as following:
619        <dl class=switch>
620        <dt>If it is a sequence of simle selector
621        (<dfn id=var-sss><var>sss</var></dfn>)</dt>
622          <dd>
623            <ol>
624            <li>If <var>sss</var> contains a universal or type selector, then
625            <a href="#algorithm-serialize-a-simple-selector" title="serialize a simple selector">serialize
626            that simple selector</a> and append the result to
627            <var>result</var>.</li>
628            <li>Otherwise, i.e. if <var>sss</var> does not contain a universal or
629            type selector, then
630            <a href="#algorithm-serialize-a-simple-selector" title="serialize a simple selector">serialize
631            a simple selector <code>*</code></a> and append the result to
632            <var>result</var>.</li>
633            <li><a href="#algorithm-serialize-a-simple-selector" title="serialize a simple selector">Serialize
634            any attribute selectors</a> in <var>sss</var>, sort the results,
635            then append them to <var>result</var> in order.</li>
636            <li><a href="#algorithm-serialize-a-simple-selector" title="serialize a simple selector">Serialize
637            any class selectors</a> in <var>sss</var>, sort the results,
638            then append them to <var>result</var> in order.</li>
639            <li><a href="#algorithm-serialize-a-simple-selector" title="serialize a simple selector">Serialize
640            any <abbr>ID</abbr> selectors</a> in <var>sss</var>, sort the results,
641            then append them to <var>result</var> in order.</li>
642            <li><a href="#algorithm-serialize-a-simple-selector" title="serialize a simple selector">Serialize
643            any pseudo$B!>(Bclass selectors</a> in <var>sss</var>, sort the results,
644            then append them to <var>result</var> in order.</li>
645            <li><a href="#algorithm-serialize-a-simple-selector" title="serialize a simple selector">Serialize
646            any pseudo elements</a> in <var>sss</var>, sort the results,
647            then append them to <var>result</var> in order.</li>
648            <li>Append a <a href="#newline">newline</a> to <var>result</var>.</li>
649            </ol>
650          </dd>
651        <dt>If it is a combinator (<dfn id=var-c><var>c</var></dfn>)</dt>
652          <dd>
653            <ol>
654            <li>Append two <code class=char>U+0020</code>
655            <code class=charname>SPACE</code> characters to <var>result</var>.</li>
656            <li>Process <var>c</var> as following:
657    
658              <dl class=switch>
659              <dt>If <var>c</var> is descendant combinator (white space)</dt>
660                <dd>Append a <code class=char>U+0020</code>
661                <code class=charname>SPACE</code> character to
662                <var>result</var>.</dd>
663              <dt>If <var>c</var> is child combinator
664              (<code class=char>></code>)</dt>
665                <dd>Append a <code class=char>U+003E</code>
666                <code class=charname>GREATER-THAN SIGN</code>
667                (<code class=char>></code>) character to <var>result</var>.</dd>
668              <dt>If <var>c</var> is adjacent sibling combinator
669              (<code class=char>+</code>)</dt>
670                <dd>Append a <code class=char>U+002B</code>
671                <code class=charname>PLUS SIGN</code> (<code class=char>+</code>)
672                character to <var>result</var>.</dd>
673              <dt>If <var>c</var> is general sibling combinator
674              (<code class=char>~</code>)</dt>
675                <dd>Append a <code class=char>U+007E</code>
676                <code class=charname>TILDE</code> (<code class=char>~</code>)
677                character to <var>result</var>.</dd>
678              </dl>
679            </li>
680            <li>Append a <code class=char>U+0020</code>
681            <code class=charname>SPACE</code> character to
682            <var>result</var>.</li>
683            </ol>
684          </dd>
685        </dl>
686      </ol>
687    </li>
688    <li>Then, <var>result</var> is the
689  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
690  representations are literally compared.</p>  representation of <var>gs</var>.</li>
691    </ol>
692    
693  </div>  </div>
694    
695  </div>  </div>
# Line 466  representations are literally compared.< Line 697  representations are literally compared.<
697  <div class="section" id="parsing">  <div class="section" id="parsing">
698  <h2>Parsing  <h2>Parsing
699  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
700  Groups of Selectors</h2>  Representations of Selectors</h2>
701    
702  <p>Since <a href="#serializing">the serializing algorithm</a> is  <p>Since <a href="#algorithm-serialize-a-group-of-selectors">the serializing
703  so designed that it always output a valid  algorithm for groups of selectors</a> is so designed that it always outputs a
704  <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
705  selectors</a>, no special parser for the  selectors</a>, no special parser for the
706  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
707  representation is necessary.  Any conforming parser for  representation is necessary.  Any conforming parser for
708  <a href="http://www.w3.org/TR/css3-selectors/#grouping">groups of  <a href="http://www.w3.org/TR/css3-selectors/#grouping">groups of
709  selectors</a> <em class=rfc2119>MAY</em> be used  selectors</a> <em class=rfc2119>MAY</em> be used
710  to parse <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>  to parse <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
711  representations of groups of selectors.</p>  representations of
712    <a href="http://www.w3.org/TR/css3-selectors/#grouping">groups of
713    selectors</a>.</p>
714    
715    <p>Likewise, <a href="#algorithm-serialize-a-simple-selector">the serializing
716    algorithm for simple selectors</a> always outputs a valid
717    <a href="#simple-selector">simple selector</a> and therefore any
718    conforming parser for <a href="#simple-selector">simple selector</a>
719    <em class=rfc2119>MAY</em> be used to parse
720    <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
721    representations of <a href="#simple-selector">simple selectors</a>.</p>
722  </div>  </div>
723    
724  <div class="section" id="examples">  <div class="section" id="examples">
# Line 485  representations of groups of selectors.< Line 726  representations of groups of selectors.<
726    
727  <p class=section-info>This section is <em>non$B!>(Bnormative</em>.</p>  <p class=section-info>This section is <em>non$B!>(Bnormative</em>.</p>
728    
 <div class="ed issue">  
 <p><a href="http://suika.fam.cx/gate/2007/css/parser-interface">Try demo</a>,  
 by choosing <q>Selectors</q> radio button.</p>  
   
729  <div class="example figure block">  <div class="example figure block">
730  <div class="caption">...</div>  <p>The <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
731    representation of a selector <code>p + q</code> is:</p>
732    
733    <pre><code>    *|p
734      + *|q
735    </code></pre>
736    </div>
737    
738  <pre><code>...</code></pre>  <div class="example figure block">
739    <p>The <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
740    representation of a selector <code>a#id.class1:n\ot(:Active)/*
741     comment
742    */.class2</code> is:</p>
743    
744    <pre><code>    *|a.class1.class2#id:not(
745            :active
746        )
747    </code></pre>
748  </div>  </div>
749    
750    <div class="example figure block">
751    <p>The <abbr title="Selectors Serialization Format for Testing">SSFT</abbr>
752    representation of a
753    <a href="http://www.w3.org/TR/css3-selectors/#grouping">group of selectors</a>
754    <code>a, #b, C[d^=e], .\31 23</code> is:</p>
755    
756    <pre><code>    *|a
757    ,
758        *|*#b
759    ,
760        *|C[|d^="e"]
761    ,
762        *|*.\00003123
763    </code></pre>
764  </div>  </div>
765    
766  </div>  </div>
# Line 513  by choosing <q>Selectors</q> radio butto Line 779  by choosing <q>Selectors</q> radio butto
779    <a href="urn:ietf:bcp:14"><abbr title="Best Current Practice">BCP</abbr>    <a href="urn:ietf:bcp:14"><abbr title="Best Current Practice">BCP</abbr>
780    14</a>, <abbr title="Request for Comments">RFC</abbr> 2119,    14</a>, <abbr title="Request for Comments">RFC</abbr> 2119,
781    <time datetime=1997-03>March 1997</time>.    <time datetime=1997-03>March 1997</time>.
782    This version of the specification is referenced</dd>    This version of the specification is referenced.</dd>
783  <dt id=ref-SELECTORS>SELECTORS</dt>  <dt id=ref-SELECTORS>SELECTORS</dt>
784    <dd><a href="http://www.w3.org/TR/2005/WD-css3-selectors-20051215"><cite>Selectors</cite></a>,    <dd><a href="http://www.w3.org/TR/2005/WD-css3-selectors-20051215"><cite>Selectors</cite></a>,
785    <abbr title="World Wide Web Consortium">W3C</abbr> Working Draft,    <abbr title="World Wide Web Consortium">W3C</abbr> Working Draft,
# Line 546  by choosing <q>Selectors</q> radio butto Line 812  by choosing <q>Selectors</q> radio butto
812  <dt id=ref-HTML5>HTML5</dt>  <dt id=ref-HTML5>HTML5</dt>
813    <dd><cite><a href="http://whatwg.org/html5"><abbr>HTML</abbr> 5</a></cite>,    <dd><cite><a href="http://whatwg.org/html5"><abbr>HTML</abbr> 5</a></cite>,
814    <abbr title="Web Hypertext Application Technology Working Group">WHATWG</abbr>    <abbr title="Web Hypertext Application Technology Working Group">WHATWG</abbr>
815    Working Draft.  Work in progress.</dd>    Working Draft, <time datetime="2007-11-03">3 November 2007</time>.
816      Work in progress.</dd>
817  <dt id=ref-SAPI>SAPI</dt>  <dt id=ref-SAPI>SAPI</dt>
818    <dd><cite><a href="http://dev.w3.org/cvsweb/~checkout~/2006/webapi/selectors-api/Overview.html?rev=1.28&amp;content-type=text/html;%20charset=utf-8">Selectors <abbr>API</abbr></a></cite>,    <dd><cite><a href="http://dev.w3.org/cvsweb/~checkout~/2006/webapi/selectors-api/Overview.html?rev=1.28&amp;content-type=text/html;%20charset=utf-8">Selectors <abbr>API</abbr></a></cite>,
819    <abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft,    <abbr title="World Wide Web Consortium">W3C</abbr> Editor's Draft,
# Line 555  by choosing <q>Selectors</q> radio butto Line 822  by choosing <q>Selectors</q> radio butto
822    <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>.
823    The latest published version of the specification is available at    The latest published version of the specification is available at
824    <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>
825  <dt id=XBL2>XBL2</dt>  <dt id=ref-XBL2>XBL2</dt>
826    <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>
827    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>.
828    Work in progress.  The latest    Work in progress.  The latest

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