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revision 1.3 by wakaba, Sun Dec 2 04:46:21 2007 UTC revision 1.15 by wakaba, Tue Dec 4 10:43:12 2007 UTC
# Line 3  Line 3 
3  <head>  <head>
4  <title>DOM Document Type Definition Module</title>  <title>DOM Document Type Definition Module</title>
5  <link rel="stylesheet" href="http://suika.fam.cx/www/style/html/spec">  <link rel="stylesheet" href="http://suika.fam.cx/www/style/html/spec">
6    <link rel="stylesheet" href="http://suika.fam.cx/www/style/def/dom">
7  <link rel="license" href="http://suika.fam.cx/c/gnu/fdl">  <link rel="license" href="http://suika.fam.cx/c/gnu/fdl">
8  </head>  </head>
9  <body class="has-abstract">  <body class="has-abstract">
10    
11  <div class="header">  <div class="header">
12  <h1>DOM Document Type Definition Module</h1>  <h1>DOM Document Type Definition Module</h1>
13  <h2>Working Draft <time datetime=2007-12-01>1 December 2007</time></h2>  <h2>Working Draft <time datetime=2007-12-03>3 December 2007</time></h2>
14    
15  <dl class="versions-uri">  <dl class="versions-uri">
16  <dt>This Version</dt>  <dt>This Version</dt>
# Line 124  raised is undefined.</p> Line 125  raised is undefined.</p>
125  interface.</p>  interface.</p>
126    
127  <p class=ed>@@ ref to DOM Binding Spec</p>  <p class=ed>@@ ref to DOM Binding Spec</p>
128    
129    <p>If the <code>strictErrorChecking</code> attribute of the
130    <code>Document</code> node is <code>false</code>, the methods are
131    not required to raise exceptions <span class=ed>[DOM3]</span>.</p>
132  </div>  </div>
133    
134  <div class=section id=dom-dtdef>  <div class=section id=dom-dtdef>
# Line 138  consists of three interfaces:</p> Line 143  consists of three interfaces:</p>
143  <li><a href="#AttributeDefinition"><code>AttributeDefinition</code></a></li>  <li><a href="#AttributeDefinition"><code>AttributeDefinition</code></a></li>
144  </ul>  </ul>
145    
146  <p>In addition, it adds methods, attributes, and/or constants to interfaces  <p>In addition, it modifies interfaces
147  <a href="#Node"><code>Node</code></a>,  <a href="#Node"><code>Node</code></a>,
148    <a href="#DocumentType"><code>DocumentType</code></a>,
149  <a href="#Entity"><code>Entity</code></a>,  <a href="#Entity"><code>Entity</code></a>,
150  <a href="#EntityReference"><code>EntityReference</code></a>, and  <a href="#EntityReference"><code>EntityReference</code></a>,
151  <a href="#Notation"><code>Notation</code></a>.  <a href="#Notation"><code>Notation</code></a>, and
152  It modifies semantics of some of methods and attributes in  <a href="#ProcessingInstruction"><code>ProcessingInstruction</code></a>.</p>
 <a href="#Node"><code>Node</code></a> and  
 <a href="#ProcessingInstruction"><code>ProcessingInstruction</code></a>  
 interfaces, for the support of new interfaces.</p>  
153    
154  <div class=section id=features>  <div class=section id=features>
155  <h3>Feature Name</h3>  <h3>Feature Name</h3>
# Line 171  feature names with or without version nu Line 174  feature names with or without version nu
174  aforementioned cases.</p>  aforementioned cases.</p>
175  </div>  </div>
176    
177    <div class=section id=section-node>
178    <h3>Modifications to the <code id=Node>Node</code> Interface</h3>
179    
180    <p>The implementation of the
181    <a href="#Node"><code>Node</code></a> interface
182    <em class=rfc2119>MUST</em> be modified as following:</p>
183    <pre class=idl><code>// Additions to the Node interface
184    
185    // Additions to the NodeType definition group
186    const unsigned short <a href="#ELEMENT_TYPE_DEFINITION_NODE">ELEMENT_TYPE_DEFINITION_NODE</a> = 81001;
187    const unsigned short <a href="#ATTRIBUTE_DEFINITION_NODE">ATTRIBUTE_DEFINITION_NODE</a> = 81002;
188    </pre>
189    
190    <p>This specification adds two new types (subinterfaces) of
191    <a href="#Node"><code>Node</code></a>: element type definition (node type
192    <a href="#ELEMENT_TYPE_DEFINITION_NODE"><code>ELEMENT_TYPE_DEFINITION_NODE</code></a>,
193    interface
194    <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>) and
195    attribute definition (node type
196    <a href="#ATTRIBUTE_DEFINITION_NODE"><code>ATTRIBUTE_DEFINITION_NODE</code></a>,
197    interface
198    <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>).  For
199    these kinds of nodes, methods and attributes in the
200    <a href="#Node"><code>Node</code></a> interface must behave as following:</p>
201    
202    <dl>
203    <dt><code id=attributes>attributes</code></dt>
204      <dd>
205        <p>On getting, the attribute <em class=rfc2119>MUST</em> return
206        <code>null</code>.</p>
207      </dd>
208    <dt><code id=baseURI>baseURI</code></dt>
209      <dd>
210        <p>On getting, the attribute <em class=rfc2119>MUST</em> return the
211        value of the <a href="#baseURI"><code>baseURI</code></a> attribute
212        of the node in the <code>ownerDocument</code> attribute of the node.
213        Note that the value might be <code>null</code>.</p>
214      </dd>
215    <dt><code id=nodeName>nodeName</code></dt>
216      <dd>
217        <p>If the node is an
218        <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>:
219        On getting, the attribute <em class=rfc2119>MUST</em> return the
220        name of the element type definition represented by the node.</p>
221    
222        <p>If the node is an
223        <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>:
224        On getting, the attribute <em class=rfc2119>MUST</em> return the
225        name of the attribute definition represented by the node.</p>
226      </dd>
227    <dt><code id=nodeType>nodeType</code></dt>
228      <dd>
229        <p>On getting, the attribute <em class=rfc2119>MUST</em> return
230        <a href="#ELEMENT_TYPE_DEFINITION_NODE"><code>ELEMENT_TYPE_DEFINITION_NODE</code></a>
231        (if the node is an
232        <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>) or
233        <a href="#ATTRIBUTE_DEFINITION_NODE"><code>ATTRIBUTE_DEFINITION_NODE</code></a>
234        (if the node is an
235        <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>).</p>
236    
237        <!-- NodeType -->
238    <p>Two constants are added to the <code id=NodeType>NodeType</code>
239    definition group of the <a href="#Node"><code>Node</code></a> interface as
240    following:</p>
241    <table>
242    <thead>
243    <tr><th scope=col>Name<th scope=col>Value<th scope=col>Description</tr>
244    </thead>
245    <tbody>
246    <tr>
247    <th scope=row><dfn id=ELEMENT_TYPE_DEFINITION_NODE class=dom-const><code>ELEMENT_TYPE_DEFINITION_NODE</code></dfn>
248    <td><code>81001</code><td>The node is an
249    <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>.</tr>
250    <tr>
251    <th scope=row><dfn id=ATTRIBUTE_DEFINITION_NODE class=dom-const><code>ATTRIBUTE_DEFINITION_NODE</code></dfn>
252    <td><code>81002</code><td>The node is an
253    <a href="#ElementTypeDefinition"><code>AttributeDefinition</code></a>.</tr>
254    </tbody>
255    </table>
256      </dd>
257    <dt><code id=nodeValue>nodeValue</code> and
258    <code id=textContent>textContent</code></dt>
259      <dd>
260        <p>If the node is an
261        <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>:
262        On getting, the attributes <em class=rfc2119>MUST</em> return the
263        name of the element type.</p>
264    
265        <div class="note memo">
266          <p>Thus, on setting the attributes does nothing
267          <span class=ed>[DOM3]</span>.</p>
268        </div>
269    
270        <p>On setting, the <a href="#textContent"><code>textContent</code></a>
271        attribute <em class=rfc2119>MUST NOT</em> raise a
272        <code>NO_MODIFICATION_ALLOWED_ERR</code> <span class=ed>@@ ref</span>.
273        <span class=ed>@@ I forgot why this requirement is necessary.</span></p>
274    
275        <p>If the node is an
276        <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>:</p>
277    
278        <pre class=ed>
279    The getter of the [CODE(DOMa)@en[[[nodeValue]]]] attribute
280    of an [CODE(DOMi)@en[[[AttributeDefinition]]]] object
281    [['''MUST''']] return the normalized default value
282    of the attribute.
283    
284    @@
285    
286    [4] The getter of the [CODE(DOMa)@en[[[textContent]]]]
287    attribute of an [CODE(DOMi)@en[[[AttributeDefinition]]]]
288    object [['''MUST''']] behave as if it were an
289    [CODE(DOMi)@en[[[Attr]]]] object.
290    
291    The setter of the [CODE(DOMa)@en[[[textContent]]]] attribute
292    of an [CODE(DOMi)@en[[[AttributeDefinition]]]] object
293    [['''MUST''']] behave as if the following algorithm
294    is performed:
295    = If the [CODE(DOMi)@en[[[AttributeDefinition]]]]
296    object is read-only, then throw an
297    [CODE(DOMc)@en[[[NO_MODIFICATION_ALLOWED_ERR]]]].
298    = Remove any child node the node has.
299    = If the new value is not empty and not [CODE(IDL)@en[[[null]]]],
300    then create a [CODE(DOMi)@en[[[Text]]]] node
301    whose [CODE(DOMa)@en[[[data]]]] is the new value
302    and append it to the [CODE(DOMi)@en[[[AttributeDefinition]]]].
303    </pre>
304      </dd>
305    <dt class=ed>@@ ...</dt>
306    </dl>
307    
308    </div>
309    
310    <div class=section id=section-documentxdoctype>
311    <h3>The <code>DocumentXDoctype</code> Interface</h3>
312    
313    <p>The <a href="#DocumentXDoctype"><code>DocumentXDoctype</code></a> interface
314    <em class=rfc2119>MUST</em> be implemented as following:</p>
315    <pre class=idl><code>interface <dfn id=DocumentXDoctype><code>DocumentXDoctype</code></dfn> {
316      DocumentType <a href="#createDocumentTypeDefinition">createDocumentTypeDefinition</a>
317        (in DOMString <a href="#createDocumentTypeDefinition-name"><var>name</var></a>)
318        raises (DOMException);
319      <a href="#ElementTypeDefinition">ElementTypeDefinition</a> <a href="#createElementTypeDefinition">createElementTypeDefinition</a>
320        (in DOMString <a href="#createElementTypeDefinition-name"><var>name</var></a>)
321        raises (DOMException);
322      <a href="#AttributeDefinition">AttributeDefinition</a> <a href="#createAttributeDefinition">createAttributeDefinition</a>
323        (in DOMString <a href="#createAttributeDefinition-name"><var>name</var></a>)
324        raises (DOMException);
325      <a href="#Entity">Entity</a> <a href="#createGeneralEntity">createGeneralEntityDefinition</a>
326        (in DOMString <a href="#createGeneralEntity-name"><var>name</var></a>)
327        raises (DOMException);
328      <a href="#Notation">Notation</a> <a href="#createNotation">createNotation</a>
329        (in DOMString <a href="#createNotation-name"><var>name</var></a>)
330        raises (DOMException);
331    }</code></pre>
332    
333    <div class=ed>@@ cast definition</div>
334    
335    <dl>
336    <dt><dfn id=createDocumentTypeDefinition class=dom-method><code>createDocumentTypeDefinition</code></dfn>,
337    method</dt>
338      <dd>
339        <p>This method creates a <code>DocumentType</code> node with the specified
340        name, belonging to the document.</p>
341        <p>The <dfn id=createDocumentTypeDefinition-name class=dom-param><var>name</var></dfn>
342        parameter is the name of the document type.</p>
343    
344        <p>When invoked, the method <em class=rfc2119>MUST</em> create and
345        return a <code>DocumentType</code> node with the following attributes:</p>
346        <dl>
347        <dt><code>attributes</code>, <code>parentNode</code></dt>
348          <dd><code>null</code>.</dd>
349        <dt><code>elementTypes</code>, <code>generalEntities</code>, and
350        <code>notations</code></dt>
351          <dd>Empty <code>NamedNodeMap</code> objects.</dd>
352        <dt><code>entities</code></dt>
353          <dd>The same value as the <code>generalEntities</code> attribute.</dd>
354        <dt><code>childNodes</code></dt>
355          <dd>An empty <code>NodeList</code> object.</dd>
356        <dt><code>internalSubset</code>, <code>publicId</code>, and
357        <code>systemId</code></dt>
358          <dd>Empty strings.</dd>
359        <dt><code>manakaiReadOnly</code> <span class=ed>[manakai]</span></dt>
360          <dd><code>false</code>.</dd>
361        <dt><code>nodeName</code></dt>
362          <dd><a href="#createDocumentTypeDefinition-name"><var>name</var></a>.</dd>
363        <dt><code>ownerDocument</code></dt>
364          <dd>The <code>Document</code> over which the method is invoked.</dd>
365        </dl>
366        <p>In addition, the method <em class=rfc2119>MUST</em> be marked as
367        containing five general entity declarations: <code>amp</code>,
368        <code>lt</code>, <code>gt</code>, <code>quot</code>, and
369        <code>apos</code>.</p>
370      </dd>
371    <dt><dfn id=createElementTypeDefinition class=dom-method><code>createElementTypeDefinition</code></dfn>,
372    method</dt>
373      <dd>
374        <p>This method creates a <code>ElementTypeDefinition</code> node with the
375        specified name, belonging to the document.</p>
376        <p>The <dfn id=createElementTypeDefinition-name class=dom-param><var>name</var></dfn>
377        parameter is the name of the element type defined by the element
378        type definition.</p>
379    
380        <p>When invoked, the method <em class=rfc2119>MUST</em> create and
381        return an
382        <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>
383        node with the following attributes:</p>
384        <dl>
385        <dt><a href="#attributeDefinitions"><code>attributeDefinitions</code></a></dt>
386          <dd>An empty <code>NamedNodeMap</code> object.</dd>
387        <dt><code>attributes</code>, <code>parentNode</code></dt>
388          <dd><code>null</code>.</dd>
389        <dt><code>childNodes</code></dt>
390          <dd>An empty <code>NodeList</code> object.</dd>
391        <dt><code>manakaiReadOnly</code> <span class=ed>[manakai]</span></dt>
392          <dd><code>false</code>.</dd>
393        <dt><code>nodeName</code></dt>
394          <dd><a href="#createElementTypeDefinition-name"><var>name</var></a>.</dd>
395        <dt><code>ownerDocument</code></dt>
396          <dd>The <code>Document</code> node over which the method is invoked.</dd>
397        <dt><a href="#ownerDocumentTypeDefinition"><code>ownerDocumentTypeDefinition</code></a></dt>
398          <dd><code>null</code>.</dd>
399        <dt class=ed>@@ Ensure all attributes are defined</dt>
400        </dl>
401      </dd>
402    <dt><dfn id=createAttributeDefinition class=dom-method><code>createAttributeDefinition</code></dfn>,
403    method</dt>
404      <dd>
405        <p>This method creates a <code>AttributeDefinition</code> node with the
406        specified name, belonging to the document.</p>
407        <p>The <dfn id=createAttributeDefinition-name class=dom-param><var>name</var></dfn>
408        parameter is the name of the attribute defined by the attribute
409        definition.</p>
410    
411        <p>When invoked, the method <em class=rfc2119>MUST</em> create and
412        return an
413        <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>
414        node with the following attributes:</p>
415        <dl>
416        <dt><code>allowedTokens</code></dt>
417          <dd>An empty <code>DOMStringList</code> object.</dd>
418        <dt><code>attributes</code>,
419        <a href="#ownerElementTypeDefinition"><code>ownerElementTypeDefinition</code></a>,
420        and <code>parentNode</code></dt>
421          <dd><code>null</code>.</dd>
422        <dt><code>childNodes</code></dt>
423          <dd>An empty <code>NodeList</code> object.</dd>
424        <dt><code>declaredType</code></dt>
425          <dd><a href="#NO_TYPE_ATTR"><code>NO_TYPE_ATTR</code></a>.</dd>
426        <dt><code>defaultType</code></dt>
427          <dd><a href="#UNKNOWN_DEFAULT"><code>UNKNOWN_DEFAULT</code></a>.</dd>
428        <dt><code>manakaiReadOnly</code> <span class=ed>[manakai]</span></dt>
429          <dd><code>false</code>.</dd>
430        <dt><code>nodeName</code></dt>
431          <dd><a href="#createAttributeDefinition-name"><var>name</var></a>.</dd>
432        <dt><code>ownerDocument</code></dt>
433          <dd>The <code>Document</code> node over which the method is invoked.</dd>
434        <dt class=ed>@@ Ensure all attributes are defined</dt>
435        </dl>
436    
437        <div class=ed>
438        <p>@@ Should we keep these statements?:
439    However, if the &lt;cfg::cfg|xml-id> configuration
440    parameter is set to <code>true</code> and the <var>name</var>
441    is <code>xml:id</code>, then the [CODE(DOMa)@en[[[declaredType]]]]
442    attribute is set to <code>ID_ATTR</code>.
443    [CODE(DOMa)@en[[[defaultType]]]]?</p>
444        </div>
445      </dd>
446    <dt><dfn id=createGeneralEntity class=dom-method><code>createGeneralEntity</code></dfn>,
447    method</dt>
448      <dd>
449        <p>This method creates a <a href="#Entity"><code>Entity</code></a> node
450        with the specified name, which represents a general entity, belonging to
451        the document.</p>
452        <p>The <dfn id=createGeneralEntity-name class=dom-param><var>name</var></dfn>
453        parameter is the name of the general entity.</p>
454    
455        <p>When invoked, the method <em class=rfc2119>MUST</em> create and return
456        an <a href="#Entity"><code>Entity</code></a> node with the following
457        attributes:</p>
458        <dl>
459        <dt><code>attributes</code>, <code>notationName</code>,
460        <a href="#ownerDocumentTypeDefinition"><code>ownerDocumentTypeDefinition</code></a>,
461        and <code>parentNode</code></dt>
462          <dd><code>null</code>.</dd>
463        <dt><code>childNodes</code></dt>
464          <dd>An empty <code>NodeList</code> object.</dd>
465        <dt><code>manakaiDeclarationBaseURI</code>,
466        <code>manakaiEntityBaseURI</code>, and
467        <code>manakaiEntityURI</code> <span class=ed>@@ ref</span></dt>
468          <dd>No explicit value is set.</dd>
469        <dt><code>manakaiHasReplacementTree</code> and
470        <code>manakaiReadOnly</code> <span class=ed>[manakai]</span></dt>
471          <dd><code>false</code>.</dd>
472        <dt><code>nodeName</code></dt>
473          <dd><a href="#createGeneralEntity-name"><var>name</var></a>.</dd>
474          <dd>
475            <div class="note memo">
476              <p>It is not an error for
477              <a href="#createGeneralEntity-name"><var>name</var></a> matching
478              to the name of one of predefined general parsed entities in
479              <abbr>XML</abbr> or <abbr>HTML</abbr>.  For example,
480              <a href="#createGeneralEntity-name"><var>name</var></a> might be
481              <code>amp</code>, resulting in an
482              <a href="#Entity"><code>Entity</code></a> node
483              with its <code>nodeName</code> attribute set to <code>amp</code>.</p>
484            </div>
485          </dd>
486        <dt><code>ownerDocument</code></dt>
487          <dd>The <code>Document</code> node over which the method is invoked.</dd>
488        <dt><code>publicId</code>, and <code>systemId</code></dt>
489          <dd><code>null</code>.</dd>
490          <dd class=ed>@@ publicId and systemId should be empty string?</dd>
491        <dt class=ed>@@ Ensure all attributes are defined</dd>
492        </dl>
493      </dd>
494    <dt><dfn id=createNotation class=dom-method><code>createNotation</code></dfn>,
495    method</dt>
496      <dd>
497        <p>This method creates a <code>Notation</code> node with the
498        specified name, belonging to the document.</p>
499        <p>The <dfn id=createNotation-name class=dom-param><var>name</var></dfn>
500        parameter is the name of the notation.</p>
501    
502        <p>When invoked, the method <em class=rfc2119>MUST</em> create and return
503        a <code>Notation</code> node with the following attributes:</p>
504        <dl>
505        <dt><code>attributes</code>,
506        <a href="#ownerDocumentTypeDefinition"><code>ownerDocumentTypeDefinition</code></a>,
507        and <code>parentNode</code></dt>
508          <dd><code>null</code>.</dd>
509        <dt><code>childNodes</code></dt>
510          <dd>An empty <code>NodeList</code> object.</dd>
511        <dt><code>manakaiDeclarationBaseURI</code></dt>
512          <dd>No explicit value is set.</dd>
513        <dt><code>manakaiReadOnly</code> <span class=ed>[manakai]</span></dt>
514          <dd><code>false</code>.</dd>
515        <dt><code>nodeName</code></dt>
516          <dd><a href="#createNotation-name"><var>name</var></a>.</dd>
517        <dt><code>ownerDocument</code></dt>
518          <dd>The <code>Document</code> node over which the method is invoked.</dd>
519        <dt><code>publicId</code> and <code>systemId</code></dt>
520          <dd><code>null</code>.</dd>
521          <dd class=ed>@@ publicId and systemId should be empty string?</dd>
522        <dt class=ed>@@ Ensure all attributes are defined</dt>
523        </dl>
524      </dd>
525    </dl>
526    
527    <p>These methods <em class=rfc2119>MUST</em> raise an
528    <code>INVALID_CHARACTER_ERR</code> exception <span class=ed>@@ ref</span>
529    if <var>name</var> is <em>not</em> a legal <code>Name</code> according to
530    the <abbr>XML</abbr> version in use, as specified in the
531    <code>xmlVersion</code> attribute of the <code>Document</code> node.</p>
532    
533    <div class="note memo">
534    <p>Non$B!>(B<abbr>XML</abbr> case is intentionally left unspecified for now,
535    since <abbr>DOM3</abbr> specification <span class=ed>@@ ref</span> does not
536    define it for <code>Document</code> methods.</p>
537    
538    <p><var>name</var> does not have to be a namespace qualified name.</p>
539    </div>
540    
541    </div>
542    
543    <div class=section id=section-documenttypedefinition>
544    <h3>The <code>DocumentTypeDefinition</code> Interface</h3>
545    
546    <p>The
547    <a href="#DocumentTypeDefinition"><code>DocumentTypeDefinition</code></a>
548    interface <em class=rfc2119>MUST</em> be implemented as following:</p>
549    <pre class=idl><code>interface <dfn id=DocumentTypeDefinition><code>DocumentTypeDefinition</code></dfn> {
550      readonly attribute NamedNodeMap <a href="#elementTypes">elementTypes</a>;
551      readonly attribute NamedNodeMap <a href="#generalEntities">generalEntities</a>;
552      readonly attribute NamedNodeMap <a href="#notations">notations</a>;
553    
554      <a href="#ElementTypeDefinition">ElementTypeDefinition</a> <a href="#getElementTypeDefinitionNode">getElementTypeDefinitionNode</a>
555        (in DOMString <a href="#getElementTypeDefinitionNode-name"><var>name</var></a>);
556      <a href="#Entity">Entity</a> <a href="#getGeneralEntityNode">getGeneralEntityNode</a>
557        (in DOMString <a href="#getGeneralEntityNode-name"><var>name</var></a>);
558      <a href="#Notation">Notation</a> <a href="#getNotationNode">getNotationNode</a>
559        (in DOMString <a href="#getNotationNode-name"><var>name</var></a>);
560    
561      void <a href="#setElementTypeDefinitionNode">setElementTypeDefinitionNode</a>
562        (in DOMString <a href="#setElementTypeDefinitionNode-node"><var>node</var></a>)
563        raises (DOMException);
564      void <a href="#setGeneralEntityNode">setGeneralEntityNode</a>
565        (in DOMString <a href="#setGeneralEntityNode-node"><var>node</var></a>)
566        raises (DOMException);
567      void <a href="#setNotationNode">setNotationNode</a>
568        (in DOMString <a href="#setNotationNode-node"><var>node</var></a>)
569        raises (DOMException);
570    }</code></pre>
571    
572    <pre class=ed>
573    [1] In an implementation that supports the
574    [CODE(URI)@en[[[http://suika.fam.cx/www/2006/feature/XDoctype]]]]
575    feature, a [CODE(DOMi)@en[[[DocumentType]]]] node
576    must implement the [CODE(DOMi)@en[[[DocumentTypeDefinition]]]]
577    interface.  See [[DOM XML Document Type Definition]>>3] for
578    details.
579    </pre>
580    
581    <dl>
582    <dt><dfn id=elementTypes class=dom-attr><code>elementTypes</code></dfn> of
583    type <code>NamedNodeMap</code>, read$B!>(Bonly</dt>
584      <dd><p>A live <code>NamedNodeMap</code> object that contains all the element
585      type definitions belonging to the <code>DocumentType</code> node.</p>
586    
587      <p>On getting, the attribute <em class=rfc2119>MUST</em> return the
588      <code>NamedNodeMap</code> object that contains all the
589      <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>
590      nodes belonging to the <code>DocumentType</code> node.  The
591      <code>NamedNodeMap</code> object <em class=rfc2119>MUST</em> be read$B!>(Bonly
592      if and only if the node is read$B!>(Bonly.  The <code>NamedNodeMap</code>
593      object <em class=rfc2119>MUST</em> be live and the same object
594      <em class=rfc2119>MUST</em> be returned for any invocation.</p>
595    
596      <p>If the <code>DocumentType</code> node is created during the process
597      to create a <abbr>DOM</abbr> from an <abbr>XML</abbr> document, the following
598      requirements are applied:  The <code>NamedNodeMap</code> object in the
599      <a href="#elementTypes"><code>elementType</code></a> attribute
600      <em class=rfc2119>MUST</em> be so transformed that the object contains
601      the <code>ElementTypeDefinition</code> nodes for the element types
602      whose name is presented as the <code>Name</code> of the element type or
603      attribute definition list declarations processed by the <abbr>XML</abbr>
604      processor.  If there is more than one element type declarations for an
605      element type, then the declarations other than the first one
606      <em class=rfc2119>MUST</em> be ignored for the purpose of constructing the
607      <code>NamedNodeMap</code> object.</p></dd>
608    <dt><dfn id=generalEntities class=dom-attr><code>generalEntities</code></dfn>
609    of type <code>NamedNodeMap</code>, read$B!>(Bonly</dt>
610      <dd><p>A live <code>NamedNodeMap</code> object that contains all the general
611      entities belonging to the <code>DocumentType</code> node.</p>
612      
613      <p>On getting, the attribute <em class=rfc2119>MUST</em> return the
614      same value as the <code>entities</code> attribute (defined in the
615      <code>DocumentType</code> interface) of the same node.</p>
616    
617      <div class="note memo">
618        <p>This attribute is part of the interface for historical reason.</p>
619      </div></dd>
620    <!--
621    All entities declared in the document type definition
622    contained in or referenced from the document entity
623    might not be exposed through this collection, depending
624    on the information provided by the XML processor for
625    the DOM implementation.  In particular, it might not
626    contain any entity if entity references are expanded
627    at the parse time.  An implementation [['''MUST NOT''']]
628    expose an [CODE(DOMi)@en[[[Entity]]]] node whose [CODE(DOMa)@en[[[nodeName]]]]
629    is equal to the name of one of five predefined general entities in
630    XML through the collection as the result of parsing of an XML
631    document that has no error.  Duplicate entity declarations are also discarded.
632    
633    The attribute [['''MUST''']] return the [CODE(DOMi)@en[[[NamedNodeMap]]]]
634    object that contains all the [CODE(DOMi)@en[[[Entity]]]] nodes
635    representing general entities belong to the node.  The returned
636    [CODE(DOMi)@en[[[NamedNodeMap]]]] object [['''MUST''']] be read-only if and only if
637    the node is read-only. Note that the [CODE(DOMi)@en[[[NamedNodeMap]]]] object is live
638    and therefore any change of read-only flag on the node is immediately
639    reflected by that of the object.
640    -->
641    <dt><dfn id=notations class=dom-attr><code>notations</code></dfn> of type
642    <code>notations</code>, read$B!>(Bonly</code>
643      <dd><p>A live <code>NamedNodeMap</code> object that contains all the
644      notations belonging to the <code>DocumentType</code> node.</p>
645      
646      <p>On getting, the attribute <em class=rfc2119>MUST</em> return the
647      same value as the <code>notations</code> attribute (defined in the
648      <code>DocumentType</code> interface) of the same node.</p>
649    
650      <div class="note memo">
651        <p>This attribute is part of the interface for historical reason.</p>
652        <p>Implementations are not required to implement the
653        <code>notations</code> attribute twice (for <code>DocumentType</code>
654        and <code>DocumentTypeDefinition</code> interfaces); they share exactly
655        same definition.</p>
656      </div></dd>
657    <!--
658    If the [CODE(DOMi)@en[[[DocumentTypeDefinition]]]] node is
659    created from an XML document, duplicate notation declarations, if any, in DTD
660    [['''MUST NOT''']] result in a node in the [CODE(DOMi)@en[[[NamedNodeMap]]]]
661    object and only the first declaration [['''MUST''']] be
662    made available as a [CODE(DOMi)@en[[[Notation]]]] node.
663    
664    ;; This definition is based on one for the
665    [CODE(DOMa)@en[[[notations]]]] attribute of the
666    [CODE(DOMi)@en[[[DocumentType]]]] interface in DOM XML module.
667    Since duplication is violation to the Validity Constraint,
668    XML parsers might vary on how notations are notified to
669    the application.  In particular, [CODE(InfoProp)@en[[[notations]]]]
670    property of the document information item in XML Information Set
671    is so defined that in case ''any'' notation is declared for
672    multiple times then the property has no value.
673    
674    The attribute [['''MUST''']] return the [CODE(DOMi)@en[[[NamedNodeMap]]]]
675    object that contains all the [CODE(DOMi)@en[[[Notation]]]] nodes
676    representing notations belong to the node.  The returned
677    [CODE(DOMi)@en[[[NamedNodeMap]]]] object [['''MUST''']] be read-only if and only if
678    the node is read-only. Note that the [CODE(DOMi)@en[[[NamedNodeMap]]]] object is live
679    and therefore any change of read-only flag on the node is immediately
680    reflected by that of the object.
681    -->
682    
683    <dt class=ed>@@ other members...
684    </dl>
685    
686    <div class=ed>
687    <p>A future version of this interface might define the
688    <code>parameterEntities</code> and getter/setter for parameter entities.
689    </div>
690    
691    </div>
692    
693    <div class=section id=section-elementtypedefinition>
694    <h3>The <code>ElementTypeDefinition</code> Interface</h3>
695    
696    <p>The <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>
697    interface <em class=rfc2119>MUST</em> be implemented as following:</p>
698    <pre class=idl><code>interface <dfn id=ElementTypeDefinition><code>ElementTypeDefinition</code></dfn> : <a href="#Node">Node</a> {
699      readonly attribute <a href="#ownerDocumentTypeDefinition">ownerDocumentTypeDefinition</a>;
700    
701      <span class=ed>@@ more</span>
702    }</code></pre>
703    
704    <pre class=ed>
705    [DFN@en[[CODE(DOMa)@en[[[ownerDocumentTypeDefinition]]]] attribute]]
706    of the [CODE(DOMi)@en[[[ElementTypeDefinition]]]]
707    interface is defined in [[manakai//DOM Extensions]>>50].</pre>
708    </div>
709    
710    <div class=section id=section-attributedefinition>
711    <h3>The <code>AttributeDefinition</code> Interface</h3>
712    
713    <p>The <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>
714    interface <em class=rfc2119>MUST</em> be implemented as following:</p>
715    <pre class=idl><code>interface <dfn id=AttributeDefinition><code>AttributeDefinition</code></dfn> : <a href="#Node">Node</a> {
716      <span class=comment>// <a href="#DeclaredValueType">DeclaredValueType</a></span>
717      const unsigned short <a href="#NO_TYPE_ATTR">NO_TYPE_ATTR</a> = 0;
718      const unsigned short <a href="#CDATA_ATTR">CDATA_ATTR</a> = 1;
719      const unsigned short <a href="#ID_ATTR">ID_ATTR</a> = 2;
720      const unsigned short <a href="#IDREF_ATTR">IDREF_ATTR</a> = 3;
721      const unsigned short <a href="#IDREFS_ATTR">IDREFS_ATTR</a> = 4;
722      const unsigned short <a href="#ENTITY_ATTR">ENTITY_ATTR</a> = 5;
723      const unsigned short <a href="#ENTITIES_ATTR">ENTITIES_ATTR</a> = 6;
724      const unsigned short <a href="#NMTOKEN_ATTR">NMTOKEN_ATTR</a> = 7;
725      const unsigned short <a href="#NMTOKENS_ATTR">NMTOKENS_ATTR</a> = 8;
726      const unsigned short <a href="#NOTATION_ATTR">NOTATION_ATTR</a> = 9;
727      const unsigned short <a href="#ENUMERATION_ATTR">ENUMERATION_ATTR</a> = 10;
728      const unsigned short <a href="#UNKNOWN_ATTR">UNKNOWN_ATTR</a> = 11;
729      
730      readonly attribute <a href="#ElementTypeDefinition">ElementTypeDefinition</a> <a href="#ownerElementTypeDefinition">ownerElementTypeDefinition</a>;
731    
732      readonly attribute unsigned short <a href="#declaredType">declaredType</a>;
733      readonly attribute unsigned short <a href="#defaultType">defaultType</a>;
734    
735      <span class=ed>...</span>
736    }</code></pre>
737    
738    <dl>
739    <dt><dfn id=ownerElementTypeDefinition class=dom-attr><code>ownerElementTypeDefinition</code></dfn>
740    of type
741    <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a>,
742    read$B!>(Bonly</dt>
743      <dd><p>The
744      <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a> to
745      which the <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>
746      node belongs.</p>
747    
748      <p>On getting, the attribute <em class=rfc2119>MUST</em> return an
749      <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a> node.
750      It <em class=rfc2119>MUST</em> be such a node that whose
751      <a href="#attributeDefinitons"><code>attributeDefinitions</code></a>
752      attribute contains the <code>NamedNodeMap</code> object that contains
753      the <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>
754      node.  If there is no such an
755      <a href="#ElementTypeDefinition"><code>ElementTypeDefinition</code></a> node,
756      then <code>null</code> <em class=rfc2119>MUST</em> be returned.</p>
757    <dt><dfn id=declaredType class=dom-attr><code>declaredType</code></dfn> of type
758    <code>unsigned short</code></dt>
759      <dd><p>The declared type <span class=ed>@@ ref</span> of the attribute.
760      It is expected that this attribute contains a value from the definition group
761      <a href="#DeclaredValueType"><code>DeclaredValueType</code></a>.</p>
762    
763      <p>On getting, the attribute <em class=rfc2119>MUST</em> return the
764      value associated to this attribute.</p>
765    
766      <p>On setting, the attribute <em class=rfc2119>MUST</em> raise a
767      <code>NO_MODIFICATION_ALLOWED_ERR</code> <span class=ed>@@ ref</span>
768      exception if the
769      <a href="#AttributeDefinition"><code>AttributeDefinition</code></a> node
770      is read$B!>(Bonly <span class=ed>@@ ref</span>.  Otherwise, it
771      <em class=rfc2119>MUST</em> set the specified value as the value
772      associated to this attribute.</p>
773    
774      <p>If the <code>AttributeDefinition</code> node is created during the process
775      to create a <abbr>DOM</abbr> from an <abbr>XML</abbr> document, an
776      appropriate value from the
777      <a href="#DeclaredValueType"><code>DeclaredValueType</code></a> constant
778      group <em class=rfc2119>MUST</em> be set to the attribute.</p>
779    
780      <!-- DeclaredValueType -->
781    <p>The definition group
782    <dfn id=DeclaredValueType><code>DeclaredValueType</code></dfn> contains
783    integers indicating the declared type of attributes.  The definition
784    group contains the following constants:</p>
785    
786    <table>
787    <thead>
788    <tr><th scope=col>Name<th scope=col>Value<th scope=col>Description</tr>
789    </thead>
790    <tbody>
791    <tr>
792    <th scope=row><dfn id=NO_TYPE_ATTR class=dom-const><code>NO_TYPE_ATTR</code>
793    <td><code>0</code><td>No value <span class=ed>[INFOSET]</span>.</tr>
794    <tr>
795    <th scope=row><dfn id=CDATA_ATTR class=dom-const><code>CDATA_ATTR</code>
796    <td><code>1</code><td><code>CDATA</code> <span class=ed>[XML]</span>.</tr>
797    <tr>
798    <th scope=row><dfn id=ID_ATTR class=dom-const><code>ID_ATTR</code>
799    <td><code>2</code><td><code>ID</code> <span class=ed>[XML]</span>.</tr>
800    <tr>
801    <th scope=row><dfn id=IDREF_ATTR class=dom-const><code>IDREF_ATTR</code>
802    <td><code>3</code><td><code>IDREF</code> <span class=ed>[XML]</span>.</tr>
803    <tr>
804    <th scope=row><dfn id=IDREFS_ATTR class=dom-const><code>IDREFS_ATTR</code>
805    <td><code>4</code><td><code>IDREFS</code> <span class=ed>[XML]</span>.</tr>
806    <tr>
807    <th scope=row><dfn id=ENTITY_ATTR class=dom-const><code>ENTITY_ATTR</code>
808    <td><code>5</code><td><code>ENTITY</code> <span class=ed>[XML]</span>.</tr>
809    <tr>
810    <th scope=row><dfn id=ENTITIES_ATTR class=dom-const><code>ENTITIES_ATTR</code>
811    <td><code>6</code><td><code>ENTITIES</code> <span class=ed>[XML]</span>.</tr>
812    <tr>
813    <th scope=row><dfn id=NMTOKEN_ATTR class=dom-const><code>NMTOKEN_ATTR</code>
814    <td><code>7</code><td><code>NMTOKEN</code> <span class=ed>[XML]</span>.</tr>
815    <tr>
816    <th scope=row><dfn id=NMTOKENS_ATTR class=dom-const><code>NMTOKENS_ATTR</code>
817    <td><code>8</code><td><code>NMTOKENS</code> <span class=ed>[XML]</span>.</tr>
818    <tr>
819    <th scope=row><dfn id=NOTATION_ATTR class=dom-const><code>NOTATION_ATTR</code>
820    <td><code>9</code><td><code>NOTATION</code> <span class=ed>[XML]</span>.</tr>
821    <tr>
822    <th scope=row><dfn id=ENUMERATION_ATTR class=dom-const><code>ENUMERATION_ATTR</code>
823    <td><code>10</code><td>Enumeration <span class=ed>[XML]</span>.</tr>
824    <tr>
825    <th scope=row><dfn id=UNKNOWN_ATTR class=dom-const><code>UNKNOWN_ATTR</code>
826    <td><code>11</code><td>Unknown, because no declaration for the attribute
827    has been read but the [all declaration processed] property
828    <span class=ed>[INFOSET]</span> would be false.</tr>
829    </tbody>
830    </table>
831    
832    <p>If no attribute type information is available, or if the source
833    of the information does not distinguish <q>no value</q> and <q>unknown</q>
834    <span class=ed>[INFOSET]</span>, then the value
835    <a href="#NO_TYPE_ATTR"><code>NO_TYPE_ATTR</code></a>
836    <em class=rfc2119>MUST</em> be used.</p>
837    
838    <div class="note memo">
839    <p>An <a href="#AttributeDefinition"><code>AttributeDefinition</code></a> node
840    created by the
841    <a href="#createAttributeDefinition"><code>createAttributeDefinition</code></a>
842    method has its <a href="#declaredType"><code>declaredType</code></a> attribute
843    set to <a href="#NO_TYPE_ATTR"><code>NO_TYPE_ATTR</code></a>.</p>
844    </div>
845    
846    <p>If the source of the information does not distinguish <q>no value</q>
847    and/or <q>unknown</q> <span class=ed>[INFOSET]</span> and
848    <code>CDATA</code> <span class=ed>[XML]</span>, then the value
849    <a href="#CDATA_ATTR"><code>CDATA_ATTR</code></a> <em class=rfc2119>MUST</em>
850    be used.</p>
851    
852    <p>In Perl binding <span class=ed>[PERLBINDING]</span>, the
853    <code>Attr</code> nodes <em class=rfc2119>MUST</em> implement the
854    <a href="#DeclaredValueType"><code>DeclaredValueType</code></a>
855    definition group.</p>
856    
857      </dd>
858    <dt><dfn id=defaultType class=dom-attr><code>defaultType</code></dfn> of
859    type <code>unsigned short</code></dt>
860      <dd><p>The type of the default for the attribute.  It is expected that this
861      attribute contains a value from the definition group
862      <a href="#DefaultValueType"><code>DefaultValueType</code></a>.</p>
863    
864      <p>On getting, the attribute <em class=rfc2119>MUST</em> return
865      the value associated to this attribute.</p>
866    
867      <p>On setting, the attribute <em class=rfc2119>MUST</em> raise a
868      <code>NO_MODIFICATION_ALLOWED_ERR</code> <span class=ed>@@ ref</span>
869      exception if the
870      <a href="#AttributeDefinition"><code>AttributeDefinition</code></a> node
871      is read$B!>(Bonly <span class=ed>@@ ref</span>.  Otherwise, it
872      <em class=rfc2119>MUST</em> set the specified value as the value
873      associated to this attribute.</p>
874    
875      <p>If the
876      <a href="#AttributeDefinition"><code>AttributeDefinition</code></a> node is
877      created during the process to create a <abbr>DOM</abbr> from an
878      <abbr>XML</abbr> document, an appropriate value from the
879      <a href="#DefaultValueType"><code>DefaultValueType</code></a> definition
880      group <em class=rfc2119>MUST</em> be set to the attribute.</p>
881    
882      <!-- DefaultValueType -->
883      <p>The definition group
884      <dfn id=DefaultValueType><code>DefaultValueType</code></dfn>
885      contains integers indicating the type of the default for the attribute.
886      The definition group contains the following constans:</p>
887    
888      <table>
889      <thead>
890      <tr><th scope=col>Name<th scope=col>Value<th scope=col>Description</tr>
891      </thead>
892      <tbody>
893      <tr>
894      <th scope=row><dfn id=UNKNOWN_DEFAULT class=dom-const><code>UNKNOWN_DEFAULT</code></dfn>
895      <td><code>0</code><td>Unknown.</tr>
896      <tr>
897      <th scope=row><dfn id=FIXED_DEFAULT class=dom-const><code>FIXED_DEFAULT</code></dfn>
898      <td><code>1</code><td>Provided explicitly and fixed
899      <span class=ed>@@ ref</span> to that value.</tr>
900      <tr>
901      <th scope=row><dfn id=REQUIRED_DEFAULT class=dom-const><code>REQUIRED_DEFAULT</code></dfn>
902      <td><code>2</code><td>No default value and the attribute have to be
903      explicitly specified.</tr>
904      <tr>
905      <th scope=row><dfn id=IMPLIED_DEFAULT class=dom-const><code>IMPLIED_DEFAULT</code></dfn>
906      <td><code>3</code><td>Implied <span class=ed>@@ ref</span>.</tr>
907      <tr>
908      <th scope=row><dfn id=EXPLICIT_DEFAULT class=dom-const><code>EXPLICIT_DEFAULT</code></dfn>
909      <td><code>4</code><td>Provided explicitly.</tr>
910      </tbody>
911      </table>
912    
913      <p>If the source of the default type does not distinguish
914      implied and unknown default types, then the value
915      <a href="#IMPLIED_DEFAULT"><code>IMPLIED_DEFAULT</code></a>
916      <em class=rfc2119>MUST</em> be used.</p>
917    
918      <div class="note memo">
919      <p>An <a href="#AttributeDefinition"><code>AttributeDefinition</code></a>
920      node created by the
921      <a href="#createAttributeDefinition"><code>createAttributeDefinition</code></a>
922      method has its <a href="#defaultType"><code>defaultType</code></a>
923      attribute set to
924      <a href="#UNKNOWN_DEFAULT"><code>UNKNOWN_DEFAULT</code></a>.</p>
925      </div></dd>
926    </dl>
927    
928    </div>
929    
930    <div class=section id=section-documenttype>
931    <h3>Modifications to the <code id=DocumentType>DocumentType</code>
932    Interface</h3>
933    
934    <p>A <a href="#DocumentType"><code>DocumentType</code></a> interface
935    <em class=rfc2119>MAY</em> contain zero or more
936    <a href="#ProcessingInstruction"><code>ProcessingInstruction</code></a>
937    nodes in the <code>NodeList</code> object contained in the
938    <code>childNodes</code> attribute of the
939    <a href="#DocumentType"><code>DocumentType</code></a> node.</p>
940    
941    <p>If the <a href="#DocumentType"><code>DocumentType</code></a> node is created
942    during the process to create a <abbr>DOM</abbr> from an <abbr>XML</abbr>
943    document, the <code>NodeList</code> object in the <code>childNodes</code>
944    object <em class=rfc2119>MUST</em> contains the
945    <a href="#ProcessingInstruction"><code>ProcessingInstruction</code></a>
946    nodes representing the processing instructions in the document type
947    definition of the document processed <span class=ed>@@ ref</span> by
948    the <abbr>XML</abbr> processor.  If the
949    <a href="#DocumentType"><code>DocumentType</code></a> node is marked
950    as read$B!>(Bonly, then all the child nodes <em class=rfc2119>MUST</em>
951    also be marked as read$B!>(Bonly.</p>
952    
953    <p>If a <a href="#DocumentType"><code>DocumentType</code></a> node is created
954    from a document type declaration information item <span class=ed>@@ ref</span>,
955    the <code>NodeList</code> object in the <code>childNodes</code> attribute
956    of the node <em class=rfc2119>MUST</em> contain the
957    <a href="#ProcessingInstruction"><code>ProcessingInstruction</code></a> nodes
958    created from the processing instruction information items in the list in the
959    [children] property of the document type declaration item in the same
960    order.</p>
961    
962    <p>If a <a href="#DocumentType"><code>DocumentType</code></a> node is mapped to
963    a document type declaration information item, the list in the [children]
964    property <em class=rfc2119>MUST</em> contain the processng instruction
965    information items created from the
966    <a href="#ProcessingInstruction"><code>ProcessingInstruction</code></a> nodes
967    in the <code>NodeList</code> object in the <code>childNodes</code> attribute
968    of the <a href="#DocumentType"><code>DocumentType</code></a> node.</p>
969    
970    <p>The implementation of the
971    <a href="#DocumentType"><code>DocumentType</code></a> interface
972    <em class=rfc2119>MUST</em> be modified as following:</p>
973    <pre class=idl><code>// Modifications to the DocumentType interface
974      attribute DOMString <a href="#publicId">publicId</a>;
975      attribute DOMString <a href="#systemId">systemId</a>;
976    
977      attribute DOMString <a href="#internalSubset">internalSubset</a>;
978    </code></pre>
979    
980    <p>The <code id=publicId>publicId</code> attribute and the
981    <code id=systemId>systemId</code> attribute of
982    <a href="#DocumentType"><code>DocumentType</code></a>,
983    <a href="#Entity"><code>Entity</code></a>, and
984    <a href="#Notation"><code>Notation</code></a> interfaces are no longer
985    read$B!>(Bonly.</p>
986    
987    <p>On setting, the attribute <em class=rfc2119>MUST</em> raise a
988    <code>NO_MODIFICATION_ALLOWED_ERR</code> <span class=ed>@@ ref</span>
989    exception if the node is read$B!>(Bonly <span class=ed>@@ ref</span>.  
990    Otherwise, it <em class=rfc2119>MUST</em> set the specified value as the value
991    associated to the attribute.  No normalization, relative reference resolution,
992    or lexical validation is performed. <span class=ed>@@ If the new
993    value is <code>null</code>, ...</span></p>
994    
995    <div class="note memo">
996    <p>Setting an invalid identifier might make the node unserializable.
997    Setting a public identifier while leaveing system identifier unspecified
998    would also make the <a href="#DocumentType"><code>DocumentType</code></a>
999    or <a href="#Entity"><code>Entity</code></a> node unserializable.</p>
1000    </div>
1001    
1002    <div class=ed>
1003    <p>ISSUE: In HTML5, Firefox 1.5, and Opera 9, not specifying public or system identifier results in empty strings.</p>
1004    </div>
1005    
1006    <p>The <code id=internalSubset>internalSubset</code> attribute of the
1007    <a href="#DocumentType"><code>DocumentType</code></a> interface is no longer
1008    read$B!>(Bonly.</p>
1009    
1010    <p>On setting, the attribute <em class=rfc2119>MUST</em> raise a
1011    <code>NO_MODIFICATION_ALLOWED_ERR</code> <span class=ed>@@ ref</span>
1012    exception if the node is read$B!>(Bonly <span class=ed>@@ ref</span>.  
1013    Otherwise, it <em class=rfc2119>MUST</em> set the specified value as the value
1014    associated to the attribute.  No normalization, or lexical validation is
1015    performed. <span class=ed>@@ If the new value is <code>null</code>,
1016    ...</span></p>
1017    
1018    </div>
1019    
1020  </div>  </div>
1021    
1022    
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