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revision 1.10 by wakaba, Tue Nov 13 01:12:26 2007 UTC revision 1.16 by wakaba, Mon Nov 26 12:38:53 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=2007-11-13>13 November 2007</time></h2>  <h2>Working Draft <time datetime=2007-11-26>26 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" id=checking-dom>  
 <h2>Checking <abbr>DOM</abbr></h2>  
   
 <p>The following algorithms and definitions are applied to  
 <abbr>XML</abbr> documents; especially, they are not applied  
 to <abbr>HTML</abbr> documents.<!-- TODO: ref to HTML5 --></p>  
123    
124  <div class=section id=error-categories>  <div class=section id=error-categories>
125  <h3>Error Classification</h3>  <h2>Error Classification</h2>
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 159  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 179  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 196  can be easily serialized into a valid XM Line 210  can be easily serialized into a valid XM
210    
211  </div>  </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 there is an element type declaration whose <code>Name</code>
226    value is already declared, then raise an
227    <a href="#xml-validity-error" id=vc-edunique><code>xml-validity-error</code></a>.</li>
228    <li>If attribute definition whose <code>Name</code> is
229    <code>xml:space</code> has <span class=ed>declared type different from
230    (default|preserve), (default), or (preserve)</span>, then raise an
231    <a href="#xml-misc-error" id=xme-ad-xml-space><code>xml-misc-error</code></a>.
232    <span class=ed>@@ duplication with
233    <a href="#xml-at-xml-space">#xml-at-xml-space</a>.<!--
234    <!ATTLIST e xml:space CDATA #IMPLIED xml:space CDATA #IMPLIED> --></span></li>
235    <li>If an empty-element tag is used for an element which is <em>not</em>
236    declared <code>EMPTY</code>, then raise an
237    <a href="#xml-misc-recommentation" id=xmr-emptyelemtag-not-empty><code>xml-misc-recommendation</code></a>.</li>
238    <li>If an empty-element tag is <em>not</em> used for an element which is
239    declared <code>EMPTY</code>, then raise an
240    <a href="#xml-misc-recommentation" id=xmr-empty-not-emptyelemtag><code>xml-misc-recommendation</code></a>.</li>
241    <!--
242    
243    #vc-PEinMarkupDecl Validity constraint: Proper Declaration/PE Nesting
244    #wfc-PEinInternalSubset Well-formedness constraint: PEs in Internal Subset
245    #ExtSubset Well-formedness constraint: External Subset
246    #PE-between-Decls Well-formedness constraint: PE Between Declarations
247    #GIMatch Well-formedness constraint: Element Type Match
248    #uniqattspec Well-formedness constraint: Unique Att Spec
249    #NoExternalRefs Well-formedness constraint: No External Entity References
250    #CleanAttrVals Well-formedness constraint: No < in Attribute Values
251    #vc-PEinGroup Validity constraint: Proper Group/PE Nesting
252    "For interoperability, if a parameter-entity reference appears in a choice, seq, or Mixed construct, its replacement text SHOULD contain at least one non-blank character, and neither the first nor last non-blank character of the replacement text SHOULD be a connector (| or ,)."
253    "For interoperability, an XML processor MAY at user option issue a warning when more than one attribute-list declaration is provided for a given element type, or more than one attribute definition is provided for a given attribute, but this is not an error."
254    
255    @@ Need detailed review, but maybe should be in parsing phase
256    
257    #vc-check-rmd Validity constraint: Standalone Document Declaration
258    
259    -->
260    </ul>
261    </div>
262    
263    <div class="section" id=checking-dom>
264    <h2>Checking <abbr>DOM</abbr></h2>
265    
266    <p>The following algorithms and definitions are applied to
267    <abbr>XML</abbr> documents; especially, they are not applied
268    to <abbr>HTML</abbr> documents.<!-- TODO: ref to HTML5 --></p>
269    
270  <div class=section id=definitions>  <div class=section id=definitions>
271  <h3>Definitions</h3>  <h3>Definitions</h3>
272    
# Line 222  is that of the <code>Document</code> nod Line 293  is that of the <code>Document</code> nod
293  validate an <abbr>XML</abbr> character data  validate an <abbr>XML</abbr> character data
294  (<dfn id=var-s><var>s</var></dfn>)</dfn> is defined as following:</p>  (<dfn id=var-s><var>s</var></dfn>)</dfn> is defined as following:</p>
295  <ol>  <ol>
296  <li class=ed>@@</li>  <li>If <var>s</var> contains a character that is <em>not</em> in
297    the character class <a href="#class-Char10"><code>Char10</code></a>,
298    then raise an
299    <a href="#xml-well-formedness-error" id=wfe-illegal-char><code>xml-well-formedness-error</code></a>.</li>
300    <li>If <var>s</var> contains a character that is in the character
301    class <a href="#class-CompatChar10"><code>CompatChar10</code></a>,
302    then raise an
303    <a href="#xml-misc-warning" id=xmw-compat-char><code>xml-misc-warning</code></a>.</li>
304    <li>If <var>s</var> contains a character that is in the character
305    class <a href="#class-ControlChar10"><code>ControlChar10</code></a>,
306    then raise an
307    <a href="#xml-misc-warning" id=xmw-control-char><code>xml-misc-warning</code></a>.</li>
308    <li class=ed>@@ XML 1.1 support</li>
309    <li>If <var>s</var> contains a <code class=char>U+000D</code>
310    <code class=charname>CARRIAGE RETURN</code> character, then
311    raise a
312    <a href="#round-trip-error" id=rte-cr><code>round-trip-error</code></a>.
313    <span class=ed>@@ We should not raise duplicate errors for U+000D
314    in attribute values.  In addition, we should support a mode where
315    U+000D will be serialized as &#x000D; (so that no round-trip-error
316    will be raised).</span></li>
317  </ol>  </ol>
318    
319  <p>The algorithm  <p>The algorithm
320  <dfn id=algorithm-to-validate-a-name title="to validate a Name">to validate a  <dfn id=algorithm-to-validate-a-name title="to validate a Name">to validate a
321  <code>Name</code> (<dfn id=var-name><var>name</var></dfn>)</dfn> is defined  <code>Name</code> (<dfn id=var-name-s><var>s</var></dfn>)</dfn> is defined
322  as following:</p>  as following:</p>
323  <ol>  <ol>
324    <li>If <var>s</var> begins with the string <code>xml</code> (in any
325    case combination), then raise an
326    <a href="#xml-misc-warning" id=xmw-reserved-name><code>xml-misc-warning</code></a>.
327    <span class=ed>@@ except for attribute names <code>xml:lang</code>,
328    <code>xml:space</code>, <code>xml:base</code>, <code>xml:id</code>,
329    <code>xmlns</code>, <code>xmlns:<var>*</var></code>,
330    pi name <code>xml-stylesheet</code>.</span><!--
331    "names beginning with a match to (('X'|'x')('M'|'m')('L'|'l')) are reserved for standardization in this or future versions of this specification.":
332    xml:base and xml:id specifications violate to this sentense!
333    --></li>
334    <!-- COLON in Name is a lowercase "should not" in a Note of [XML10],
335    [XML11]. -->
336  <li class=ed>@@</li>  <li class=ed>@@</li>
337  </ol>  </ol>
338    
# Line 295  following:</p> Line 398  following:</p>
398        <a href="#algorithm-to-check-a-node" title="check a node">check        <a href="#algorithm-to-check-a-node" title="check a node">check
399        <var>n<sub><var>c</var></sub></var></a> recusrively.</li>        <var>n<sub><var>c</var></sub></var></a> recusrively.</li>
400        </ol></li>        </ol></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 <code>value</code> attribute of <var>n</var> is neither
404        <code>default</code> nor <code>preserve</code>, then it is an
405        <a href="#xml-misc-error" id=xme-attr-xml-space><code>xml-misc-error</code></a>.<!--
406        Note that <!ATTLIST e xml:space (default|preserve) "a">...
407        <e xml:space="default"/> is conforming and valid. --></li>
408        <li class=ed>@@ xml:lang value is not a language tag [RFC 3066 or its
409        successor] or an empty string, then xml-misc-warning
410        (a "fact"-level error; not an XML error).</li>
411      <li class=ed>@@ <code>specified</code>,      <li class=ed>@@ <code>specified</code>,
412      <code>manakaiAttributeType</code></li>      <code>manakaiAttributeType</code> (#ValueType Validity constraint: Attribute Value Type)</li>
413        <!-- xml:space MUST be declared to be valid. -->
414        <li>Let <dfn id=var-v><var>v</var></dfn> be the value of the
415        attribute <code>value</code> of <var>n</var>.</li>
416        <li>Validate the <var>n</var> against the <span class=ed>declared
417        type</span> as following:
418          <dl class=switch>
419          <dt class=ed><code>ID_ATTR</code></dt>
420            <dd>
421              <ol>
422              <li><span class=ed>Validate <var>v</var> as an
423              <code>Name</code>.</span>  If it fails, then raise an
424              <a href="#xml-validity-error" id=vc-id-name><code>xml-validity-error</code></a>.</li>
425              <li><span class=ed>If <code>ID</code> <var>v</var> is defined,</span>
426              then raise an  
427              <a href="#xml-validity-error" id=vc-id-duplication><code>xml-validity-error</code></a>.</li>
428              </ol>
429            </dd>
430          <dt class=ed>IDREF_ATTR</dt>
431            <dd>
432              <ol>
433              <li><span class=ed>Validate <var>v</var> as an
434              <code>Name</code>.</span>  If it fails, then raise an
435              <a href="#xml-validity-error" id=vc-idref-name><code>xml-validity-error</code></a>.</li>
436              <li><span class=ed>If <code>ID</code> <var>v</var> is NOT
437              defined,</span> then raise an  
438              <a href="#xml-validity-error" id=vc-idref-match><code>xml-validity-error</code></a>.</li>
439              </ol>
440            </dd>
441          <dt class=ed>IDREFS_ATTR</dt>
442            <dd class=ed>@@</dd>
443          <dt class=ed>ENTITY_ATTR</dt>
444            <dd>
445              <ol>
446              <li><span class=ed>Validate <var>v</var> as an
447              <code>Name</code>.</span>  If it fails, then raise an
448              <a href="#xml-validity-error" id=vc-entname-name><code>xml-validity-error</code></a>.</li>
449              <li><span class=ed>If <code>Entity</code> <var>v</var> is NOT
450              defined,</span> then raise an  
451              <a href="#xml-validity-error" id=vc-entname-match><code>xml-validity-error</code></a>.</li>
452              </ol>
453            </dd>
454          <dt class=ed>ENTITIES_ATTR</dt>
455            <dd class=ed>@@</dd>
456          <dt class=ed>NMTOKEN_ATTR</dt>
457            <dd>
458              <ol>
459              <li><span class=ed>Validate <var>v</var> as an
460              <code>Nmtoken</code>.</span>  If it fails, then raise an
461              <a href="#xml-validity-error" id=vc-nmtok-name><code>xml-validity-error</code></a>.</li>
462              </ol>
463            </dd>
464          <dt class=ed>NMTOKENS_ATTR</dt>
465            <dd class=ed>@@</dd>
466          <dt class=ed>NOTATION_ATTR</dt>
467            <dd class=ed><var>v</var> must be one of enumerated values.
468            If not, then raise an
469            <a href="#xml-validity-error" id=vc-notatn-match><code>xml-validity-error</code></a>.</dd>
470          <dt class=ed>ENUMERATED_ATTR</dt>
471            <dd class=ed><var>v</var> must be one of enumerated values.
472            If not, then raise an
473            <a href="#xml-validity-error" id=vc-enum><code>xml-validity-error</code></a>.</dd>
474          <dt class=ed>@@</dt>
475          </dl>
476        </li>
477        <li>If <span class=ed>default is NOT #IMPLIED or #REQUIRED</span>, then
478        raise an
479        <a href="#xml-validity-error" id=vc-id-default><code>xml-validity-error</code></a>.</li>
480      </ol>      </ol>
481    </dd>    </dd>
482  <dt>If <var>n</var> is an <code>AttributeDefinition</code> node</dt>  <dt>If <var>n</var> is an <code>AttributeDefinition</code> node</dt>
483    <dd>    <dd>
484      <ol>      <ol>
485      <li class=ed></li>      <li class=ed></li>
486        <li>If <code>nodeName</code> attribute of <var>n</var> is
487        <code>xml:space</code> <span class=ed>@@ or {xml namespace}:space ?</span>
488        and <span class=ed>its declared type is different from (default|preserve),
489        (default), or (preserve)</span>, then raise an
490        <a href="#xml-misc-error" id=xme-at-xml-space><code>xml-misc-error</code></a>.</li>
491      <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
492      <code>childNodes</code> list of <var>n</var>,      <code>childNodes</code> list of <var>n</var>,
493        <ol>        <ol>
# Line 316  following:</p> Line 501  following:</p>
501        <a href="#algorithm-to-check-a-node" title="check a node">check        <a href="#algorithm-to-check-a-node" title="check a node">check
502        <var>n<sub><var>c</var></sub></var></a> recusrively.</li>        <var>n<sub><var>c</var></sub></var></a> recusrively.</li>
503        </ol></li>        </ol></li>
504        <li class=ed>If <code>NOTATION_ATTR</code>, enumerated values MUST
505        be declared.  If not, then raise an
506        <a href="#xml-validity-error" id=vc-notatn-declared><code>xml-validity-error</code></a>.</li>
507        <li class=ed>If <code>NOTATION_ATTR</code> or <code>ENUMERATED_ATTR</code>,
508        values MUST all be distinct.  If not, then raise an
509        <a href="#xml-validity-error" id=vc-no-duplicate-tokens><code>xml-validity-error</code></a>.</li>
510        <li class=ed>If <code>NOTATION_ATTR</code> on an <code>EMPTY</code>
511        element, then raise an
512        <a href="#xml-validity-error" id=vc-no-notation-empty><code>xml-validity-error</code></a>.</li>
513      </ol>      </ol>
514    </dd>    </dd>
515  <dt>If <var>n</var> is a <code>CDATASection</code> node</dt>  <dt>If <var>n</var> is a <code>CDATASection</code> node</dt>
# Line 325  following:</p> Line 519  following:</p>
519      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>data</code> attribute value as an <abbr>XML</abbr> character
520      data</a>.</li>      data</a>.</li>
521      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains
522      a string <code>]]></code>, then it is an      a string <code>]]></code>, then raise an
523      <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>
524      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
525      any nodes, they are in      any nodes, they are in
526      <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 335  following:</p> Line 529  following:</p>
529  <dt>If <var>n</var> is a <code>Comment</code> node</dt>  <dt>If <var>n</var> is a <code>Comment</code> node</dt>
530    <dd>    <dd>
531      <ol>      <ol>
532        <li>Raise an
533        <a href="#round-trip-warning" id=rtw-comment><code>round-trip-warning</code></a>.</li>
534      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the
535      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>data</code> attribute value as an <abbr>XML</abbr> character
536      data</a>.</li>      data</a>.</li>
537      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains
538      a string <code>--</code>, or if it ends with a character      a string <code>--</code>, or if it ends with a character
539      <code>-</code>, then it is an      <code>-</code>, then raise an
540      <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>.<!--
541        "for compatibility" --></li>
542      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
543      any nodes, they are in      any nodes, they are in
544      <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 403  following:</p> Line 600  following:</p>
600      <ol>      <ol>
601      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li><a href="#algorithm-to-validate-a-ncname">Validate the
602      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>
603        <li>Follow the following substeps:
604          <ol>
605          <li>If <code>ownerDocument</code> attribute of <var>n</var> is
606          <code>null</code>, then abort these substeps.</li>
607          <li>If <code>documentElement</code> attribute of the node
608          set to <code>ownerDocument</code> attribute of <var>n</var> is
609          <code>null</code>, then abort these substeps.</li>
610          <li>If <code>nodeName</code> attribute of the node set to
611          <code>documentElement</code> attribute of the node set to
612          <code>ownerDocument</code> attribute of <var>n</var> is
613          different from <code>nodeName</code> of <var>n</var>,
614          then raise an
615          <a href="#xml-validity-error" id=vc-roottype><code>xml-validity-error</code></a>.</li></li>
616          </ol>
617        </li>
618      <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
619      the <code>publicId</code> attribute value as a public identifier</a>.</li>      the <code>publicId</code> attribute value as a public identifier</a>.</li>
620      <li>If the <code>systemId</code> attribute value contains      <li>If the <code>systemId</code> attribute value contains
# Line 448  following:</p> Line 660  following:</p>
660        <a href="#algorithm-to-check-a-node" title="check a node">check        <a href="#algorithm-to-check-a-node" title="check a node">check
661        <var>n<sub><var>c</var></sub></var></a> recursively.</li>        <var>n<sub><var>c</var></sub></var></a> recursively.</li>
662        </ol></li>        </ol></li>
663        <li class=ed>@@ #elementvalid Validity constraint: Element Valid</li>
664        <li class=ed>@@ #uniqattspec Well-formedness constraint: Unique Att Spec</li>
665      </ol>      </ol>
666    </dd>    </dd>
667  <dt>If <var>n</var> is an <code>ElementTypeDefinition</code> node</dt>  <dt>If <var>n</var> is an <code>ElementTypeDefinition</code> node</dt>
# Line 457  following:</p> Line 671  following:</p>
671      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
672      any nodes, they are in      any nodes, they are in
673      <a href="#xml-well-formedness-error" id=wfe-et-child><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-et-child><code>xml-well-formedness-error</code></a>.</li>
674        <li class=ed>@@ <q cite="http://www.w3.org/TR/2006/REC-xml-20060816/#elemdecls">At user option, an XML processor MAY issue a warning when a declaration mentions an element type for which no declaration is provided, but this is not an error.</q></li>
675        <li class=ed>@@ <q cite="http://www.w3.org/TR/2006/REC-xml-20060816/#sec-element-content">For compatibility, it is an error if the content model allows an element to match more than one occurrence of an element type in the content model. </q></li>
676        <li class=ed>@@ #vc-MixedChildrenUnique
677        Validity constraint: No Duplicate Types</li>
678        <li class=ed>@@ <q cite="http://www.w3.org/TR/2006/REC-xml-20060816/#attdecls">At user option, an XML processor MAY issue a warning if attributes are declared for an element type not itself declared, but this is not an error.</q></li>
679        <li>If there is more than one <code>AttributeDefinition</code> node
680        with <span class=ed>attribute type <code>ID</code></span> in the
681        <code>NamedNodeMap</code> list contained in the
682        <code>attributeDefinitions</code> attribute of <var>n</var>, then raise an
683        <a href="#xml-validity-error" id=vc-one-id-per-el><code>xml-validity-error</code></a>.</li>
684        <li>If there is more than one <code>AttributeDefinition</code> node
685        with <span class=ed>attribute type <code>NOTATION</code></span> in the
686        <code>NamedNodeMap</code> list contained in the
687        <code>attributeDefinitions</code> attribute of <var>n</var>, then raise an
688        <a href="#xml-validity-error" id=vc-one-notation-per><code>xml-validity-error</code></a>.</li>
689        <li class=ed>"For interoperability, the same Nmtoken  SHOULD NOT occur more than once in the enumerated attribute types of a single element type."</li>
690      </ol>      </ol>
691    </dd>    </dd>
692  <dt>If <var>n</var> is an <code>Entity</code> node</dt>  <dt>If <var>n</var> is an <code>Entity</code> node</dt>
# Line 532  following:</p> Line 762  following:</p>
762  <dt>If <var>n</var> is a <code>ProcessingInstruction</code> node</dt>  <dt>If <var>n</var> is a <code>ProcessingInstruction</code> node</dt>
763    <dd>    <dd>
764      <ol>      <ol>
765      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li>If the <code>target</code> attribute value matches to the string
766      <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  
767      <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>
768      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li>Otherwise, <a href="#algorithm-to-validate-a-ncname">validate the
769      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>target</code> attribute value as an <code>NCName</code></a>.</li>
770        <li>Then,
771        <a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML character data">validate
772        the <code>data</code> attribute value as an <abbr>XML</abbr> character
773      data</a>.</li>      data</a>.</li>
774      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains a string
775      a string <code>?></code>, or starts with either      <code>?></code>, then raise a
776      <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>
777      <code class=char>U+000D</code>, or <code class=char>U+0020</code>      <li>If the <code>data</code> attribute value starts with either
778      character, then it is a      <code class=char>U+0009</code> <code class=charname>CHARACTER
779      <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
780        FEED</code>, <code class=char>U+000D</code> <code class=charname>CARRIAGE
781        RETURN</code>, or <code class=char>U+0020</code>
782        <code class=charname>SPACE</code> character, then raise a
783        <a href="#round-trip-error" id=rte-pi-s><code>round-trip-error</code></a>.</li>
784      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
785      any nodes, they are in      any nodes, then raise an
786      <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>
787      </ol>      </ol>
788    </dd>    </dd>
# Line 569  following:</p> Line 804  following:</p>
804  </div>  </div>
805    
806  </div>  </div>
807    
808    <div id=classes class=section>
809    <h2>Character Classes</h2>
810    
811    <p>This section defines a couple of character classes.
812    These classes are referred to by algorithms specified above.</p>
813    
814    <p>Character class <dfn id=class-Char10><code>Char10</code></dfn>
815    contains the following characters:</p>
816    <ul>
817    <li><code class=char>U+0009</code> <code class=charname>CHARACTER
818    TABULATION</code></li>
819    <li><code class=char>U+000A</code> <code class=charname>LINE FEED</code></li>
820    <li><code class=char>U+000D</code> <code class=charname>CARRIAGE
821    RETURN</code></li>
822    <li><code class=char>U+0020</code> <code class=charname>SPACE</code>
823    .. <code class=char>U+D7FF</code></li>
824    <li><code class=char>U+E000</code> .. <code class=char>U+FFFD</code>
825    <code class=charname>REPLACEMENT CHARACTER</code></li>
826    <li><code class=char>U+10000</code> .. <code class=char>U+10FFFF</code></li>
827    </ul>
828    <div class="note memo">
829    <p>This character class contains all characters allowed in the production rule
830    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-Char"><code>Char</code></a>
831    of <abbr>XML</abbr> 1.0
832    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
833    </div>
834    
835    <p>Character class <dfn id=class-CompatChar10><code>CompatChar10</code></dfn>
836    contains the following characters:</p>
837    <ul>
838    <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>
839    </ul>
840    
841    <p>Character class <dfn id=class-ControlChar10><code>ControlChar10</code></dfn>
842    contains the following characters:</p>
843    <ul>
844    <li><code class=char>U+007F</code> <code class=charname>DELETE</code> ..
845    <code class=char>U+0084</code> <code class=charname>INDEX</code></li>
846    <li><code class=char>U+0086</code> <code class=charname>START OF SELECTED
847    AREA</code> .. <code class=char>U+009F</code> <code class=charname>APPLICATION
848    PROGRAM COMMAND</code></li>
849    <li><code class=char>U+FDD0</code> .. <code class=char>U+FDEF</code></li>
850    <li><code class=char>U+1FFFE</code> .. <code class=char>U+1FFFF</code></li>
851    <li><code class=char>U+2FFFE</code> .. <code class=char>U+2FFFF</code></li>
852    <li><code class=char>U+3FFFE</code> .. <code class=char>U+3FFFF</code></li>
853    <li><code class=char>U+4FFFE</code> .. <code class=char>U+4FFFF</code></li>
854    <li><code class=char>U+5FFFE</code> .. <code class=char>U+5FFFF</code></li>
855    <li><code class=char>U+6FFFE</code> .. <code class=char>U+6FFFF</code></li>
856    <li><code class=char>U+7FFFE</code> .. <code class=char>U+7FFFF</code></li>
857    <li><code class=char>U+8FFFE</code> .. <code class=char>U+8FFFF</code></li>
858    <li><code class=char>U+9FFFE</code> .. <code class=char>U+9FFFF</code></li>
859    <li><code class=char>U+AFFFE</code> .. <code class=char>U+AFFFF</code></li>
860    <li><code class=char>U+BFFFE</code> .. <code class=char>U+BFFFF</code></li>
861    <li><code class=char>U+CFFFE</code> .. <code class=char>U+CFFFF</code></li>
862    <li><code class=char>U+DFFFE</code> .. <code class=char>U+DFFFF</code></li>
863    <li><code class=char>U+EFFFE</code> .. <code class=char>U+EFFFF</code></li>
864    <li><code class=char>U+FFFFE</code> .. <code class=char>U+FFFFF</code></li>
865    <li><code class=char>U+10FFFE</code> .. <code class=char>U+10FFFF</code></li>
866    </ul>
867    <div class="note memo">
868    <p>This character class contains the characters listed in the Note in
869    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#charsets">Section 2.2</a>
870    of <abbr>XML</abbr> 1.0
871    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>,
872    as amended by
873    <a href="http://www.w3.org/XML/xml-V10-4e-errata#E02">errata</a>.</p>
874    </div>
875    
876    </div>
877    
878  <div id="references" class="section reference">  <div id="references" class="section reference">
879  <h2>References</h2>  <h2>References</h2>
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