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revision 1.8 by wakaba, Mon Nov 12 13:54:44 2007 UTC revision 1.14 by wakaba, Wed Nov 14 12:30:06 2007 UTC
# Line 17  Line 17 
17  <body class="has-abstract">  <body class="has-abstract">
18    
19  <div class="header">  <div class="header">
20  <h1>manakai's XML Conformance Checking</h1>  <h1>manakai's <abbr>XML</abbr> Conformance Checking</h1>
21  <h2>Working Draft <time datetime=2007-11-12>12 November 2007</time></h2>  <h2>Working Draft <time datetime=2007-11-14>14 November 2007</time></h2>
22    
23  <dl class="versions-uri">  <dl class="versions-uri">
24  <dt>This Version</dt>  <dt>This Version</dt>
# Line 120  In addition, the order in which <a href= Line 120  In addition, the order in which <a href=
120  raised is undefined.</p>  raised is undefined.</p>
121  </div>  </div>
122    
 <div class="section">  
 <h2 class=ed>Algorithms</h2>  
123    
124  <p>The following algorithms and definitions are applied to  <div class=section id=error-categories>
125  <abbr>XML</abbr> documents; especially, they are not applied  <h2>Error Classification</h2>
 to <abbr>HTML</abbr> documents.<!-- TODO: ref to HTML5 --></p>  
126    
127  <p class=ed>If a <code>Document</code> node has no  <p class=ed>If a <code>Document</code> node has no
128  xml-well-formedness-error, entity-error, and unknown-error,  xml-well-formedness-error, entity-error, and unknown-error,
# Line 156  can be easily serialized into a valid XM Line 153  can be easily serialized into a valid XM
153    </dd>    </dd>
154  <dt><dfn id=round-trip-error><code>round-trip-error</code></dfn></dt>  <dt><dfn id=round-trip-error><code>round-trip-error</code></dfn></dt>
155    <dd class=ed>@@</dd>    <dd class=ed>@@</dd>
156    <dt><dfn id=round-trip-warning><code>round-trip-warning</code></dfn></dt>
157      <dd>
158        <p>A <a href="#round-trip-warning"><code>round-trip-warning</code></a>
159        will be raised when a construct, which might not be restored to the same
160        construct when it is serialized and then re-parsed by a conforming
161        processor, is encountered.</p>
162        <div class="example memo">
163          <p>For a <code>Comment</code> node a
164          <a href="#round-trip-warning"><code>round-trip-warning</code></a> will
165          be raised, since <abbr>XML</abbr> processors are not required to
166          report texts of comments for applications.</p>
167        </div>
168      </dd>
169  <dt class=ed><dfn id=unknown-error><code>unknown-error</code></dfn>?</dt>  <dt class=ed><dfn id=unknown-error><code>unknown-error</code></dfn>?</dt>
170    <dd class=ed>@@</dd>    <dd class=ed>@@</dd>
171  <dt><dfn id=xml-misc-error><code>xml-misc-error</code></dt>  <dt><dfn id=xml-misc-error><code>xml-misc-error</code></dt>
# Line 176  can be easily serialized into a valid XM Line 186  can be easily serialized into a valid XM
186    <a href="@@/#dt-fatal">fatal error</a>)    <a href="@@/#dt-fatal">fatal error</a>)
187    that is not classified to any other <a href="#error-category">error    that is not classified to any other <a href="#error-category">error
188    category</a>. <span class=ed>@@ What errors fall into this category?</span></dd>    category</a>. <span class=ed>@@ What errors fall into this category?</span></dd>
189    <dt><dfn id=xml-misc-recommendation><code>xml-misc-recommendation</code></dfn></dt>
190      <dd>
191        <p>An
192        <a href="#xml-misc-recommendation"><code>xml-misc-recommendation</code></a>
193        will be raised if a <em class=rfc2119>SHOULD</em>$B!>(Blevel requirement
194        in <abbr>XML</abbr> specification is not met.</p>
195      </dd>
196  <dt><dfn id=xml-validity-error><code>xml-validity-error</code></dfn></dt>  <dt><dfn id=xml-validity-error><code>xml-validity-error</code></dfn></dt>
197    <dd>A violation of validity constraint in XML document.</dd>    <dd>A violation of validity constraint in XML document.</dd>
198  <dt><dfn id=xml-well-formedness-error><code>xml-well-formedness-error</code></dfn></dt>  <dt><dfn id=xml-well-formedness-error><code>xml-well-formedness-error</code></dfn></dt>
# Line 191  can be easily serialized into a valid XM Line 208  can be easily serialized into a valid XM
208  (MAY or MUST), #dt-compat for compatibility,  (MAY or MUST), #dt-compat for compatibility,
209  #dt-interop for interoperability</p></div>  #dt-interop for interoperability</p></div>
210    
211    </div>
212    
213    <div class=section id=parsing-xml>
214    <h2>Parsing <abbr>XML</abbr> Document</h2>
215    
216    <ul>
217    <li>If the <abbr>XML</abbr> document does not begin with an
218    <abbr>XML</abbr> declaration, then raise an
219    <a href="#xml-misc-recommentation" id=xmr-xml-decl><code>xml-misc-recommendation</code></a>.</li>
220    <li>If the replacement text of an entity declaration is
221    <code>&lt;</code>, then raise an
222    <a href="#xml-misc-warning" id=xmw-entity-value-lt><code>xml-misc-warning</code></a>.<!--
223    "strongly advised to avoid" in a Note in Section 2.3 of [XML10], [XML11].
224    --></li>
225    <li>If attribute definition whose <code>Name</code> is
226    <code>xml:space</code> has <span class=ed>declared type different from
227    (default|preserve), (default), or (preserve)</span>, then raise an
228    <a href="#xml-misc-error" id=xme-ad-xml-space><code>xml-misc-error</code></a>.
229    <span class=ed>@@ duplication with
230    <a href="#xml-at-xml-space">#xml-at-xml-space</a>.<!--
231    <!ATTLIST e xml:space CDATA #IMPLIED xml:space CDATA #IMPLIED> --></span></li>
232    <!--
233    
234    #vc-PEinMarkupDecl Validity constraint: Proper Declaration/PE Nesting
235    #wfc-PEinInternalSubset Well-formedness constraint: PEs in Internal Subset
236    #ExtSubset Well-formedness constraint: External Subset
237    #PE-between-Decls Well-formedness constraint: PE Between Declarations
238    
239    @@ Need detailed review, but maybe should be in parsing phase
240    
241    #vc-check-rmd Validity constraint: Standalone Document Declaration
242    
243    -->
244    </ul>
245    </div>
246    
247    <div class="section" id=checking-dom>
248    <h2>Checking <abbr>DOM</abbr></h2>
249    
250    <p>The following algorithms and definitions are applied to
251    <abbr>XML</abbr> documents; especially, they are not applied
252    to <abbr>HTML</abbr> documents.<!-- TODO: ref to HTML5 --></p>
253    
254    <div class=section id=definitions>
255    <h3>Definitions</h3>
256    
257  <p>The <dfn id=xml-version><abbr>XML</abbr> version</dfn> of a node is  <p>The <dfn id=xml-version><abbr>XML</abbr> version</dfn> of a node is
258  the <abbr>XML</abbr> version of the document to which the node belongs.  the <abbr>XML</abbr> version of the document to which the node belongs.
259  For a <code>Documemt</code> node, the <abbr>XML</abbr> version  For a <code>Documemt</code> node, the <abbr>XML</abbr> version
260  of the document is the value of the <code>xmlVersion</code>  of the document is the value of the <code>xmlVersion</code>
261  attribute.  For a <code>DocumentType</code> node whose  attribute of the node.  For a <code>DocumentType</code> node whose
262  <code>ownerDocument</code> is set to <code>null</code>,  <code>ownerDocument</code> attribute is set to <code>null</code>,
263  the <abbr>XML</abbr> version of the document is <code>1.0</code>.  the <abbr>XML</abbr> version of the document is <code>1.0</code><!--
264    since createDocumentType [DOM3CORE] assumes XML 1.0 [XML10TE] -->.
265  For any other node, the <abbr>XML</abbr> version of the document  For any other node, the <abbr>XML</abbr> version of the document
266  is that of the <code>Document</code> node contained in the  is that of the <code>Document</code> node contained in the
267  <code>ownerDocument</code> attribute of the node.</p>  <code>ownerDocument</code> attribute of the node.</p>
268    
269    </div>
270    
271    
272    <div class=section id=checking-components>
273    <h3>Checking Components</h3>
274    
275    <p>The algorithm
276    <dfn id=algorithm-to-validate-an-xml-character-data title-"to validate an XML character data">to
277    validate an <abbr>XML</abbr> character data
278    (<dfn id=var-s><var>s</var></dfn>)</dfn> is defined as following:</p>
279    <ol>
280    <li>If <var>s</var> contains a character that is <em>not</em> in
281    the character class <a href="#class-Char10"><code>Char10</code></a>,
282    then raise an
283    <a href="#xml-well-formedness-error" id=wfe-illegal-char><code>xml-well-formedness-error</code></a>.</li>
284    <li>If <var>s</var> contains a character that is in the character
285    class <a href="#class-CompatChar10"><code>CompatChar10</code></a>,
286    then raise an
287    <a href="#xml-misc-warning" id=xmw-compat-char><code>xml-misc-warning</code></a>.</li>
288    <li>If <var>s</var> contains a character that is in the character
289    class <a href="#class-ControlChar10"><code>ControlChar10</code></a>,
290    then raise an
291    <a href="#xml-misc-warning" id=xmw-control-char><code>xml-misc-warning</code></a>.</li>
292    <li class=ed>@@ XML 1.1 support</li>
293    <li>If <var>s</var> contains a <code class=char>U+000D</code>
294    <code class=charname>CARRIAGE RETURN</code> character, then
295    raise a
296    <a href="#round-trip-error" id=rte-cr><code>round-trip-error</code></a>.
297    <span class=ed>@@ We should not raise duplicate errors for U+000D
298    in attribute values.  In addition, we should support a mode where
299    U+000D will be serialized as &#x000D; (so that no round-trip-error
300    will be raised).</span></li>
301    </ol>
302    
303    <p>The algorithm
304    <dfn id=algorithm-to-validate-a-name title="to validate a Name">to validate a
305    <code>Name</code> (<dfn id=var-name-s><var>s</var></dfn>)</dfn> is defined
306    as following:</p>
307    <ol>
308    <li>If <var>s</var> begins with the string <code>xml</code> (in any
309    case combination), then raise an
310    <a href="#xml-misc-warning" id=xmw-reserved-name><code>xml-misc-warning</code></a>.
311    <span class=ed>@@ except for attribute names <code>xml:lang</code>,
312    <code>xml:space</code>, <code>xml:base</code>, <code>xml:id</code>,
313    <code>xmlns</code>, <code>xmlns:<var>*</var></code>,
314    pi name <code>xml-stylesheet</code>.</span></li>
315    <!-- COLON in Name is a lowercase "should not" in a Note of [XML10],
316    [XML11]. -->
317    <li class=ed>@@</li>
318    </ol>
319    
320    <p>The algorithm
321    <dfn id=algorithm-to-validate-a-ncname title="to validate an NCName">to
322    validate an <code>NCName</code> (<dfn id=var-name><var>name</var></dfn>)</dfn>
323    is defined as following:</p>
324    <ol>
325    <li class=ed>@@</li>
326    </ol>
327    
328    <p>To <dfn id=algorithm-to-validate-a-public-identifier title="validate a public identifier">validate
329    a public identifier (<dfn id=var-pid><var>pid</var></dfn>)</dfn>, the
330    algorithm below <em class=rfc2119>MUST</em> be used:</p>
331    <ol>
332      <li>If <var>pid</var> contains any character
333      that is outside of the range of <code>#x20 | #xD | #xA |
334      [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%]</code><!-- @@ TODO: formal def -->,
335      then it is an
336      <a href="#xml-well-formedness-error" id=wfe-pubid-char><code>xml-well-formedness-error</code></a>.</li>
337      <li>If <var>pid</var> contains one of <code class=char>U+0009</code>
338      <code class=charname>CHARACTER TABULATION</code>,
339      <code class=char>U+000A</code> <code class=charname>CARRIAGE RETURN</code>,
340      and <code class=char>U+000D</code> <code class=charname>LINE FEED</code>
341      characters, if the first character of <var>pid</var> is
342      <code class=char>U+0020</code> <code class=charname>SPACE</code> character,
343      if the last character of <var>pid</var> is <code class=char>U+0020</code>
344      <code class=charname>SPACE</code> character, or if there is a
345      <code class=char>U+0020</code> <code class=charname>SPACE</code> character
346      immediately followed by another <code class=char>U+0020</code>
347      <code class=charname>SPACE</code> character in <var>pid</var>, then it is a
348      <a href="#round-trip-error" id=rte-pubid-space><code>round-trip-error</code></a>.</li>
349      <li class=ed>@@ Should we check formal-public-identifierness?</li>
350    </ol>
351    
352    </div>
353    
354    <div class=section id=checking-node>
355    <h3>Checking <code>Node</code></h3>
356    
357  <p>The algorithm <dfn title="to check a node" id=algorithm-to-check-a-node>to  <p>The algorithm <dfn title="to check a node" id=algorithm-to-check-a-node>to
358  check a node (<dfn id=var-n><var>n</var></dfn>)</dfn> is defined as  check a node (<dfn id=var-n><var>n</var></dfn>)</dfn> is defined as
359  following:</p>  following:</p>
# Line 227  following:</p> Line 379  following:</p>
379        <a href="#algorithm-to-check-a-node" title="check a node">check        <a href="#algorithm-to-check-a-node" title="check a node">check
380        <var>n<sub><var>c</var></sub></var></a> recusrively.</li>        <var>n<sub><var>c</var></sub></var></a> recusrively.</li>
381        </ol></li>        </ol></li>
382        <li>If <code>nodeName</code> attribute of <var>n</var> is
383        <code>xml:space</code> <span class=ed>@@ or {xml namespace}:space ?</span>
384        and <code>value</code> attribute of <var>n</var> is neither
385        <code>default</code> nor <code>preserve</code>, then it is an
386        <a href="#xml-misc-error" id=xme-attr-xml-space><code>xml-misc-error</code></a>.<!--
387        Note that <!ATTLIST e xml:space (default|preserve) "a">...
388        <e xml:space="default"/> is conforming and valid. --></li>
389        <li class=ed>@@ xml:lang value is not a language tag [RFC 3066 or its
390        successor] or an empty string, then xml-misc-warning
391        (a "fact"-level error; not an XML error).</li>
392      <li class=ed>@@ <code>specified</code>,      <li class=ed>@@ <code>specified</code>,
393      <code>manakaiAttributeType</code></li>      <code>manakaiAttributeType</code></li>
394        <!-- xml:space MUST be declared to be valid. -->
395      </ol>      </ol>
396    </dd>    </dd>
397  <dt>If <var>n</var> is an <code>AttributeDefinition</code> node</dt>  <dt>If <var>n</var> is an <code>AttributeDefinition</code> node</dt>
398    <dd>    <dd>
399      <ol>      <ol>
400      <li class=ed></li>      <li class=ed></li>
401        <li>If <code>nodeName</code> attribute of <var>n</var> is
402        <code>xml:space</code> <span class=ed>@@ or {xml namespace}:space ?</span>
403        and <span class=ed>its declared type is different from (default|preserve),
404        (default), or (preserve)</span>, then raise an
405        <a href="#xml-misc-error" id=xme-at-xml-space><code>xml-misc-error</code></a>.</li>
406      <li>For each node <dfn id=var-ad-nc><var>n<sub><var>c</var></sub></var></dfn> in the      <li>For each node <dfn id=var-ad-nc><var>n<sub><var>c</var></sub></var></dfn> in the
407      <code>childNodes</code> list of <var>n</var>,      <code>childNodes</code> list of <var>n</var>,
408        <ol>        <ol>
# Line 257  following:</p> Line 425  following:</p>
425      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>data</code> attribute value as an <abbr>XML</abbr> character
426      data</a>.</li>      data</a>.</li>
427      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains
428      a string <code>]]></code>, then it is an      a string <code>]]></code>, then raise an
429      <a href="#xml-well-formedness-error" id=wfe-cs-mse><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-cs-mse><code>xml-well-formedness-error</code></a>.<!-- "for compatibility" --></li>
430      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
431      any nodes, they are in      any nodes, they are in
432      <a href="#xml-well-formedness-error" id=wfe-cs-child><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-cs-child><code>xml-well-formedness-error</code></a>.</li>
# Line 267  following:</p> Line 435  following:</p>
435  <dt>If <var>n</var> is a <code>Comment</code> node</dt>  <dt>If <var>n</var> is a <code>Comment</code> node</dt>
436    <dd>    <dd>
437      <ol>      <ol>
438        <li>Raise an
439        <a href="#round-trip-warning" id=rtw-comment><code>round-trip-warning</code></a>.</li>
440      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the
441      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>data</code> attribute value as an <abbr>XML</abbr> character
442      data</a>.</li>      data</a>.</li>
443      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains
444      a string <code>--</code>, or if it ends with a character      a string <code>--</code>, or if it ends with a character
445      <code>-</code>, then it is an      <code>-</code>, then raise an
446      <a href="#xml-well-formedness-error" id=wfe-comment-com><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-comment-com><code>xml-well-formedness-error</code></a>.<!--
447        "for compatibility" --></li>
448      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
449      any nodes, they are in      any nodes, they are in
450      <a href="#xml-well-formedness-error" id=wfe-comment-child><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-comment-child><code>xml-well-formedness-error</code></a>.</li>
# Line 335  following:</p> Line 506  following:</p>
506      <ol>      <ol>
507      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li><a href="#algorithm-to-validate-a-ncname">Validate the
508      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>
509        <li>Follow the following substeps:
510          <ol>
511          <li>If <code>ownerDocument</code> attribute of <var>n</var> is
512          <code>null</code>, then abort these substeps.</li>
513          <li>If <code>documentElement</code> attribute of the node
514          set to <code>ownerDocument</code> attribute of <var>n</var> is
515          <code>null</code>, then abort these substeps.</li>
516          <li>If <code>nodeName</code> attribute of the node set to
517          <code>documentElement</code> attribute of the node set to
518          <code>ownerDocument</code> attribute of <var>n</var> is
519          different from <code>nodeName</code> of <var>n</var>,
520          then raise an
521          <a href="#xml-validity-error" id=vc-roottype><code>xml-validity-error</code></a>.</li></li>
522          </ol>
523        </li>
524      <li><a href="#algorithm-to-validate-a-public-identifier" title="validate a public identifier">Validate      <li><a href="#algorithm-to-validate-a-public-identifier" title="validate a public identifier">Validate
525      the <code>publicId</code> attribute value as a public identifier</a>.</li>      the <code>publicId</code> attribute value as a public identifier</a>.</li>
526      <li>If the <code>systemId</code> attribute value contains      <li>If the <code>systemId</code> attribute value contains
# Line 464  following:</p> Line 650  following:</p>
650  <dt>If <var>n</var> is a <code>ProcessingInstruction</code> node</dt>  <dt>If <var>n</var> is a <code>ProcessingInstruction</code> node</dt>
651    <dd>    <dd>
652      <ol>      <ol>
653      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li>If the <code>target</code> attribute value matches to the string
654      <code>target</code> attribute value as an <code>NCName</code></a>.</li>      <code>xml</code> in any case combination, then raise a
     <li>If the <code>target</code> attribute value matches to  
     <code>XML</code> case-insensitively, then it is a  
655      <a href="#xml-well-formedness-error" id=wfe-pi-xml><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-pi-xml><code>xml-well-formedness-error</code></a>.</li>
656      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li>Otherwise, <a href="#algorithm-to-validate-a-ncname">validate the
657      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>target</code> attribute value as an <code>NCName</code></a>.</li>
658        <li>Then,
659        <a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML character data">validate
660        the <code>data</code> attribute value as an <abbr>XML</abbr> character
661      data</a>.</li>      data</a>.</li>
662      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains a string
663      a string <code>?></code>, or starts with either      <code>?></code>, then raise a
664      <code class=char>U+0009</code>, <code class=char>U+000A</code>,      <a href="#xml-well-formedness-error" id=wfe-pi-pic><code>xml-well-formedness-error</code></a>.</li>
665      <code class=char>U+000D</code>, or <code class=char>U+0020</code>      <li>If the <code>data</code> attribute value starts with either
666      character, then it is a      <code class=char>U+0009</code> <code class=charname>CHARACTER
667      <a href="#round-trip-error" id=rte-pi-data><code>round-trip-error</code></a>.</li>      TABULATION</code>, <code class=char>U+000A</code> <code class=charname>LINE
668        FEED</code>, <code class=char>U+000D</code> <code class=charname>CARRIAGE
669        RETURN</code>, or <code class=char>U+0020</code>
670        <code class=charname>SPACE</code> character, then raise a
671        <a href="#round-trip-error" id=rte-pi-s><code>round-trip-error</code></a>.</li>
672      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
673      any nodes, they are in      any nodes, then raise an
674      <a href="#xml-well-formedness-error" id=wfe-pi-child><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-pi-child><code>xml-well-formedness-error</code></a>.</li>
675      </ol>      </ol>
676    </dd>    </dd>
# Line 498  following:</p> Line 689  following:</p>
689    <dd><span class=ed>xml-well-formedness-error?  unknown-error?</span></dd>    <dd><span class=ed>xml-well-formedness-error?  unknown-error?</span></dd>
690  </dl>  </dl>
691    
 <p>The algorithm  
 <dfn id=algorithm-to-validate-an-xml-character-data title-"to validate an XML character data">to  
 validate an <abbr>XML</abbr> character data  
 (<dfn id=var-s><var>s</var></dfn>)</dfn> is defined as following:</p>  
 <ol>  
 <li class=ed>@@</li>  
 </ol>  
   
 <p>The algorithm  
 <dfn id=algorithm-to-validate-a-name title="to validate a Name">to validate a  
 <code>Name</code> (<dfn id=var-name><var>name</var></dfn>)</dfn> is defined  
 as following:</p>  
 <ol>  
 <li class=ed>@@</li>  
 </ol>  
   
 <p>The algorithm  
 <dfn id=algorithm-to-validate-a-ncname title="to validate an NCName">to  
 validate an <code>NCName</code> (<dfn id=var-name><var>name</var></dfn>)</dfn>  
 is defined as following:</p>  
 <ol>  
 <li class=ed>@@</li>  
 </ol>  
   
 <p>To <dfn id=algorithm-to-validate-a-public-identifier title="validate a public identifier">validate  
 a public identifier (<dfn id=var-pid><var>pid</var></dfn>)</dfn>, the  
 algorithm below <em class=rfc2119>MUST</em> be used:</p>  
 <ol>  
   <li>If <var>pid</var> contains any character  
   that is outside of the range of <code>#x20 | #xD | #xA |  
   [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%]</code><!-- @@ TODO: formal def -->,  
   then it is an  
   <a href="#xml-well-formedness-error" id=wfe-pubid-char><code>xml-well-formedness-error</code></a>.</li>  
   <li>If <var>pid</var> contains one of <code class=char>U+0009</code>  
   <code class=charname>CHARACTER TABULATION</code>,  
   <code class=char>U+000A</code> <code class=charname>CARRIAGE RETURN</code>,  
   and <code class=char>U+000D</code> <code class=charname>LINE FEED</code>  
   characters, if the first character of <var>pid</var> is  
   <code class=char>U+0020</code> <code class=charname>SPACE</code> character,  
   if the last character of <var>pid</var> is <code class=char>U+0020</code>  
   <code class=charname>SPACE</code> character, or if there is a  
   <code class=char>U+0020</code> <code class=charname>SPACE</code> character  
   immediately followed by another <code class=char>U+0020</code>  
   <code class=charname>SPACE</code> character in <var>pid</var>, then it is a  
   <a href="#round-trip-error" id=rte-pubid-space><code>round-trip-error</code></a>.</li>  
   <li class=ed>@@ Should we check formal-public-identifierness?</li>  
 </ol>  
   
692  </div>  </div>
693    
694  <div class="section" id="examples">  </div>
 <h2>Examples</h2>  
   
 <p class=section-info>This section is <em>non$B!>(Bnormative</em>.</p>  
695    
696  <div class="ed issue">  <div id=classes class=section>
697    <h2>Character Classes</h2>
698    
699  <div class="example figure block">  <p>This section defines a couple of character classes.
700  <div class="caption">...</div>  These classes are referred to by algorithms specified above.</p>
701    
702  <pre><code>...</code></pre>  <p>Character class <dfn id=class-Char10><code>Char10</code></dfn>
703    contains the following characters:</p>
704    <ul>
705    <li><code class=char>U+0009</code> <code class=charname>CHARACTER
706    TABULATION</code></li>
707    <li><code class=char>U+000A</code> <code class=charname>LINE FEED</code></li>
708    <li><code class=char>U+000D</code> <code class=charname>CARRIAGE
709    RETURN</code></li>
710    <li><code class=char>U+0020</code> <code class=charname>SPACE</code>
711    .. <code class=char>U+D7FF</code></li>
712    <li><code class=char>U+E000</code> .. <code class=char>U+FFFD</code>
713    <code class=charname>REPLACEMENT CHARACTER</code></li>
714    <li><code class=char>U+10000</code> .. <code class=char>U+10FFFF</code></li>
715    </ul>
716    <div class="note memo">
717    <p>This character class contains all characters allowed in the production rule
718    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-Char"><code>Char</code></a>
719    of <abbr>XML</abbr> 1.0
720    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
721  </div>  </div>
722    
723    <p>Character class <dfn id=class-CompatChar10><code>CompatChar10</code></dfn>
724    contains the following characters:</p>
725    <ul>
726    <li class=ed>@@ <q>Document authors are encouraged to avoid "compatibility characters", as defined in section 6.8 of [Unicode @@ Unicode 2.0 @@] (see also D21 in section 3.6 of [Unicode3]).</q></li>
727    </ul>
728    
729    <p>Character class <dfn id=class-ControlChar10><code>ControlChar10</code></dfn>
730    contains the following characters:</p>
731    <ul>
732    <li><code class=char>U+007F</code> <code class=charname>DELETE</code> ..
733    <code class=char>U+0084</code> <code class=charname>INDEX</code></li>
734    <li><code class=char>U+0086</code> <code class=charname>START OF SELECTED
735    AREA</code> .. <code class=char>U+009F</code> <code class=charname>APPLICATION
736    PROGRAM COMMAND</code></li>
737    <li><code class=char>U+FDD0</code> .. <code class=char>U+FDEF</code></li>
738    <li><code class=char>U+1FFFE</code> .. <code class=char>U+1FFFF</code></li>
739    <li><code class=char>U+2FFFE</code> .. <code class=char>U+2FFFF</code></li>
740    <li><code class=char>U+3FFFE</code> .. <code class=char>U+3FFFF</code></li>
741    <li><code class=char>U+4FFFE</code> .. <code class=char>U+4FFFF</code></li>
742    <li><code class=char>U+5FFFE</code> .. <code class=char>U+5FFFF</code></li>
743    <li><code class=char>U+6FFFE</code> .. <code class=char>U+6FFFF</code></li>
744    <li><code class=char>U+7FFFE</code> .. <code class=char>U+7FFFF</code></li>
745    <li><code class=char>U+8FFFE</code> .. <code class=char>U+8FFFF</code></li>
746    <li><code class=char>U+9FFFE</code> .. <code class=char>U+9FFFF</code></li>
747    <li><code class=char>U+AFFFE</code> .. <code class=char>U+AFFFF</code></li>
748    <li><code class=char>U+BFFFE</code> .. <code class=char>U+BFFFF</code></li>
749    <li><code class=char>U+CFFFE</code> .. <code class=char>U+CFFFF</code></li>
750    <li><code class=char>U+DFFFE</code> .. <code class=char>U+DFFFF</code></li>
751    <li><code class=char>U+EFFFE</code> .. <code class=char>U+EFFFF</code></li>
752    <li><code class=char>U+FFFFE</code> .. <code class=char>U+FFFFF</code></li>
753    <li><code class=char>U+10FFFE</code> .. <code class=char>U+10FFFF</code></li>
754    </ul>
755    <div class="note memo">
756    <p>This character class contains the characters listed in the Note in
757    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#charsets">Section 2.2</a>
758    of <abbr>XML</abbr> 1.0
759    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>,
760    as amended by
761    <a href="http://www.w3.org/XML/xml-V10-4e-errata#E02">errata</a>.</p>
762  </div>  </div>
763    
764  </div>  </div>

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