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4  <title>manakai's XML Conformance Checking</title>  <title>manakai's XML Conformance Checking</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">
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15    </style>
16  </head>  </head>
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=2007-12-01>1 December 2007</time></h2>
22    
23  <dl class="versions-uri">  <dl class="versions-uri">
24  <dt>This Version</dt>  <dt>This Version</dt>
# Line 111  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 129  into a well$B!>(Bformed XML document. Line 135  into a well$B!>(Bformed XML document.
135  can be easily serialized into a valid XML document.</p>  can be easily serialized into a valid XML document.</p>
136  </div>  </div>
137    
138    <p class=ed>To be a conforming <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#dt-validating">validating XML processor</a>,
139    ...</p>
140    
141  <p>Errors are classified into these  <p>Errors are classified into these
142  <dfn id=error-category title="error category">error categories</dfn>:</p>  <dfn id=error-category title="error category">error categories</dfn>:</p>
143    
# Line 147  can be easily serialized into a valid XM Line 156  can be easily serialized into a valid XM
156    </dd>    </dd>
157  <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>
158    <dd class=ed>@@</dd>    <dd class=ed>@@</dd>
159    <dt><dfn id=round-trip-warning><code>round-trip-warning</code></dfn></dt>
160      <dd>
161        <p>A <a href="#round-trip-warning"><code>round-trip-warning</code></a>
162        will be raised when a construct, which might not be restored to the same
163        construct when it is serialized and then re-parsed by a conforming
164        processor, is encountered.</p>
165        <div class="example memo">
166          <p>For a <code>Comment</code> node a
167          <a href="#round-trip-warning"><code>round-trip-warning</code></a> will
168          be raised, since <abbr>XML</abbr> processors are not required to
169          report texts of comments for applications.</p>
170        </div>
171      </dd>
172  <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>
173    <dd class=ed>@@</dd>    <dd class=ed>@@</dd>
174  <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 167  can be easily serialized into a valid XM Line 189  can be easily serialized into a valid XM
189    <a href="@@/#dt-fatal">fatal error</a>)    <a href="@@/#dt-fatal">fatal error</a>)
190    that is not classified to any other <a href="#error-category">error    that is not classified to any other <a href="#error-category">error
191    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>
192    <dt><dfn id=xml-misc-recommendation><code>xml-misc-recommendation</code></dfn></dt>
193      <dd>
194        <p>An
195        <a href="#xml-misc-recommendation"><code>xml-misc-recommendation</code></a>
196        will be raised if a <em class=rfc2119>SHOULD</em>$B!>(Blevel requirement
197        in <abbr>XML</abbr> specification is not met.</p>
198      </dd>
199  <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>
200    <dd>A violation of validity constraint in XML document.</dd>    <dd>A violation of validity constraint in XML document.</dd>
201  <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 182  can be easily serialized into a valid XM Line 211  can be easily serialized into a valid XM
211  (MAY or MUST), #dt-compat for compatibility,  (MAY or MUST), #dt-compat for compatibility,
212  #dt-interop for interoperability</p></div>  #dt-interop for interoperability</p></div>
213    
214    </div>
215    
216    <div class=section id=parsing-xml>
217    <h2>Parsing <abbr>XML</abbr> Document</h2>
218    
219    <ul>
220    <li>If the <abbr>XML</abbr> document does not begin with an
221    <abbr>XML</abbr> declaration, then raise an
222    <a href="#xml-misc-recommentation" id=xmr-xml-decl><code>xml-misc-recommendation</code></a>.</li>
223    <li>If the replacement text of an entity declaration is
224    <code>&lt;</code>, then raise an
225    <a href="#xml-misc-warning" id=xmw-entity-value-lt><code>xml-misc-warning</code></a>.<!--
226    "strongly advised to avoid" in a Note in Section 2.3 of [XML10], [XML11].
227    --></li>
228    <li>If there is an element type declaration whose <code>Name</code>
229    value is already declared, then raise an
230    <a href="#xml-validity-error" id=vc-edunique><code>xml-validity-error</code></a>.</li>
231    <li>If attribute definition whose <code>Name</code> is
232    <code>xml:space</code> has <span class=ed>declared type different from
233    (default|preserve), (default), or (preserve)</span>, then raise an
234    <a href="#xml-misc-error" id=xme-ad-xml-space><code>xml-misc-error</code></a>.
235    <span class=ed>@@ duplication with
236    <a href="#xml-at-xml-space">#xml-at-xml-space</a>.<!--
237    <!ATTLIST e xml:space CDATA #IMPLIED xml:space CDATA #IMPLIED> --></span></li>
238    <li>If an empty-element tag is used for an element which is <em>not</em>
239    declared <code>EMPTY</code>, then raise an
240    <a href="#xml-misc-recommentation" id=xmr-emptyelemtag-not-empty><code>xml-misc-recommendation</code></a>.</li>
241    <li>If an empty-element tag is <em>not</em> used for an element which is
242    declared <code>EMPTY</code>, then raise an
243    <a href="#xml-misc-recommentation" id=xmr-empty-not-emptyelemtag><code>xml-misc-recommendation</code></a>.</li>
244    <!--
245    
246    #vc-PEinMarkupDecl Validity constraint: Proper Declaration/PE Nesting
247    #wfc-PEinInternalSubset Well-formedness constraint: PEs in Internal Subset
248    #ExtSubset Well-formedness constraint: External Subset
249    #PE-between-Decls Well-formedness constraint: PE Between Declarations
250    #GIMatch Well-formedness constraint: Element Type Match
251    #uniqattspec Well-formedness constraint: Unique Att Spec
252    #NoExternalRefs Well-formedness constraint: No External Entity References
253    #CleanAttrVals Well-formedness constraint: No < in Attribute Values
254    #vc-PEinGroup Validity constraint: Proper Group/PE Nesting
255    "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 ,)."
256    "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."
257    #condsec-nesting Validity constraint: Proper Conditional Section/PE Nesting
258    #wf-Legalchar Well-formedness constraint: Legal Character
259    #textent Well-formedness constraint: Parsed Entity
260    #norecursion Well-formedness constraint: No Recursion
261    #indtd Well-formedness constraint: In DTD
262    "External parsed entities SHOULD each begin with a text declaration."
263    "It is an error for a reference to an unparsed entity to appear in the EntityValue in an entity declaration."
264    #UniqueNotationName Validity constraint: Unique Notation Name
265    
266    @@ Need detailed review, but maybe should be in parsing phase
267    
268    #vc-check-rmd Validity constraint: Standalone Document Declaration
269    
270    @@ Need dtailed review
271    
272    #wf-entdeclared Well-formedness constraint: Entity Declared
273    #vc-entdeclared Validity constraint: Entity Declared
274    "For interoperability, valid documents SHOULD declare the entities amp, lt, gt, apos, quot, in the form specified in 4.6 Predefined Entities."
275    "If the entities lt or amp are declared, they MUST be declared as internal entities whose replacement text is a character reference to the respective character (less-than sign or ampersand) being escaped; the double escaping is REQUIRED for these entities so that references to them produce a well-formed result. If the entities gt, apos, or quot are declared, they MUST be declared as internal entities whose replacement text is the single character being escaped (or a character reference to that character; the double escaping here is OPTIONAL but harmless)."
276    
277    @@ flaged and then reported in DOM check phase
278    
279    "Entities encoded in UTF-16 MUST and entities encoded in UTF-8 MAY begin with the Byte Order Mark"
280    "In the absence of external character encoding information (such as MIME headers), parsed entities which are stored in an encoding other than UTF-8 or UTF-16 MUST begin with a text declaration"
281    "In an encoding declaration, the values "UTF-8", "UTF-16", "ISO-10646-UCS-2", and "ISO-10646-UCS-4" SHOULD be used for the various encodings and transformations of Unicode / ISO/IEC 10646, the values "ISO-8859-1", "ISO-8859-2", ... "ISO-8859-n" (where n is the part number) SHOULD be used for the parts of ISO 8859, and the values "ISO-2022-JP", "Shift_JIS", and "EUC-JP" SHOULD be used for the various encoded forms of JIS X-0208-1997. It is RECOMMENDED that character encodings registered (as charsets) with the Internet Assigned Numbers Authority [IANA-CHARSETS], other than those just listed, be referred to using their registered names; other encodings SHOULD use names starting with an "x-" prefix."
282    
283    @@ in parsing phase
284    
285    "It is a fatal error when an XML processor encounters an entity with an encoding that it is unable to process. It is a fatal error if an XML entity is determined (via default, encoding declaration, or higher-level protocol) to be in a certain encoding but contains byte sequences that are not legal in that encoding."
286    
287    -->
288    </ul>
289    </div>
290    
291    <div class="section" id=checking-dom>
292    <h2>Checking <abbr>DOM</abbr></h2>
293    
294    <p>The following algorithms and definitions are applied to
295    <abbr>XML</abbr> documents; especially, they are not applied
296    to <abbr>HTML</abbr> documents.<!-- TODO: ref to HTML5 --></p>
297    
298    <div class=section id=definitions>
299    <h3>Definitions</h3>
300    
301  <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
302  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.
303  For a <code>Documemt</code> node, the <abbr>XML</abbr> version  For a <code>Documemt</code> node, the <abbr>XML</abbr> version
304  of the document is the value of the <code>xmlVersion</code>  of the document is the value of the <code>xmlVersion</code>
305  attribute.  For a <code>DocumentType</code> node whose  attribute of the node.  For a <code>DocumentType</code> node whose
306  <code>ownerDocument</code> is set to <code>null</code>,  <code>ownerDocument</code> attribute is set to <code>null</code>,
307  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><!--
308    since createDocumentType [DOM3CORE] assumes XML 1.0 [XML10TE] -->.
309  For any other node, the <abbr>XML</abbr> version of the document  For any other node, the <abbr>XML</abbr> version of the document
310  is that of the <code>Document</code> node contained in the  is that of the <code>Document</code> node contained in the
311  <code>ownerDocument</code> attribute of the node.</p>  <code>ownerDocument</code> attribute of the node.</p>
312    
313    </div>
314    
315    
316    <div class=section id=checking-components>
317    <h3>Conformance Checking Algorithms for Components</h3>
318    
319    <p>To
320    <dfn id=algorithm-to-validate-an-xml-character-data title="validate an XML string">to
321    validate an <abbr>XML</abbr> string (<dfn id=var-s><var>s</var></dfn>)</dfn>,
322    the following algorithm <em class=rfc2119>MUST</em> be used:</p>
323    <ol>
324    <li>If <var>s</var> contains a character that is <em>not</em> in
325    the character class <a href="#class-Char10"><code>Char10</code></a>,
326    then raise an
327    <a href="#xml-well-formedness-error" id=wfe-illegal-char><code>xml-well-formedness-error</code></a>.</li>
328    <li>If <var>s</var> contains a character that is in the character
329    class <a href="#class-CompatChar10"><code>CompatChar10</code></a>,
330    then raise an
331    <a href="#xml-misc-warning" id=xmw-compat-char><code>xml-misc-warning</code></a>.</li>
332    <li>If <var>s</var> contains a character that is in the character
333    class <a href="#class-ControlChar10"><code>ControlChar10</code></a>,
334    then raise an
335    <a href="#xml-misc-warning" id=xmw-control-char><code>xml-misc-warning</code></a>.</li>
336    <li class=ed>@@ XML 1.1 support</li>
337    <li>If <var>s</var> contains a <code class=char>U+000D</code>
338    <code class=charname>CARRIAGE RETURN</code> character, then
339    raise a
340    <a href="#round-trip-error" id=rte-cr><code>round-trip-error</code></a>.
341    <span class=ed>@@ We should not raise duplicate errors for U+000D
342    in attribute values.  In addition, we should support a mode where
343    U+000D will be serialized as &#x000D; (so that no round-trip-error
344    will be raised).</span></li>
345    </ol>
346    
347    <p>To
348    <dfn id=algorithm-to-validate-a-name title="validate a Name">validate a
349    <code>Name</code> (<dfn id=var-name-s><var>s</var></dfn>)</dfn>, the following
350    algorithm <em class=rfc2119>MUST</em> be used:</p>
351    <ol>
352    <li>If <var>s</var> is an empty string, then raise an
353    <a href="#xml-well-formedness-error" id=wfe-name-empty><code>xml-well-formedness-error</code></a>.
354    Abort these steps.</li>
355    <li><a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML string">Validate
356    <var>s</var> as an <abbr>XML</abbr> string</a>.</li>
357    <li>If the first character in <var>s</var> is a character that is
358    <em>not</em> in the character class
359    <a href="#class-NameStartChar10"><code>NameStartChar10</code></a>, then raise
360    an
361    <a href="#xml-well-formedness-error" id=wfe-name-startchar><code>xml-well-formedness-error</code></a>.</li>
362    <li>If a character other than the first character in <var>s</var> is a
363    character that is <em>not</em> in the character class
364    <a href="#class-NameChar10"><code>NameChar10</code></a>, then raise an
365    <a href="#xml-well-formedness-error" id=wfe-name-char><code>xml-well-formedness-error</code></a>.</li>
366    <li>If <var>s</var> begins with the string <code>xml</code> (in any
367    case combination), then raise an
368    <a href="#xml-misc-warning" id=xmw-reserved-name><code>xml-misc-warning</code></a>.
369    <span class=ed>@@ except for attribute names <code>xml:lang</code>,
370    <code>xml:space</code>, <code>xml:base</code>, <code>xml:id</code>,
371    <code>xmlns</code>, <code>xmlns:<var>*</var></code>,
372    pi name <code>xml-stylesheet</code>.</span><!--
373    "names beginning with a match to (('X'|'x')('M'|'m')('L'|'l')) are reserved for standardization in this or future versions of this specification.":
374    xmlns, xml-stylesheet, xml:base and xml:id specifications violate to this sentense!
375    --></li>
376    <!-- COLON in Name is a lowercase "should not" in a Note of [XML10],
377    [XML11]. -->
378    <li class=ed>@@ XML 1.1 support</li>
379    </ol>
380    
381    <p>To
382    <dfn id=algorithm-to-validate-an-ncname title="validate an NCName">validate
383    an <code>NCName</code> (<dfn id=var-ncname-s><var>s</var></dfn>)</dfn>, the
384    following algorithm <em class=rfc2119>MUST</em> be used:</p>
385    <ol>
386    <li><a href="#algorithm-to-validate-a-name" title="validate a Name">Validate
387    <var>s</var> as a <code>Name</code></a>.</li>
388    <li class=ed>@@</li>
389    </ol>
390    
391    <p>To
392    <dfn id=algorithm-to-validate-a-public-identifier title="validate a public identifier">validate
393    a public identifier (<dfn id=var-pid><var>pid</var></dfn>)</dfn>, the
394    following algorithm <em class=rfc2119>MUST</em> be used:</p>
395    <ol>
396    <li>If <var>pid</var> is <code>null</code>, abort these steps.</li>
397    <li>If <var>pid</var> contains a character that is <em>not</em> in the
398    character class <a href="#class-PubidChar"><code>PubidChar</code></a>, then
399    raise an
400    <a href="#xml-well-formedness-error" id=wfe-pubid-char><code>xml-well-formedness-error</code></a>.</li>
401      <li>If <var>pid</var> contains one of <code class=char>U+0009</code>
402      <code class=charname>CHARACTER TABULATION</code>,
403      <code class=char>U+000A</code> <code class=charname>CARRIAGE RETURN</code>,
404      and <code class=char>U+000D</code> <code class=charname>LINE FEED</code>
405      characters, if the first character of <var>pid</var> is
406      <code class=char>U+0020</code> <code class=charname>SPACE</code> character,
407      if the last character of <var>pid</var> is <code class=char>U+0020</code>
408      <code class=charname>SPACE</code> character, or if there is a
409      <code class=char>U+0020</code> <code class=charname>SPACE</code> character
410      immediately followed by another <code class=char>U+0020</code>
411      <code class=charname>SPACE</code> character in <var>pid</var>, then it is a
412      <a href="#round-trip-error" id=rte-pubid-space><code>round-trip-error</code></a>.
413      <span class=ed>Is this really a roundtripness problem?  XML spec
414      does only define the way to match public identifiers in fact, no
415      canonical form.</span></li>
416    </ol>
417    
418    <p>To
419    <dfn id=algorithm-to-validate-a-system-identifier title="validate a system identifier">validate
420    a system identifier (<dfn id=var-sid><var>sid</var></dfn>)</dfn>, the
421    following algorithm <em class=rfc2119>MUST</em> be used:</p>
422    <ol>
423      <li>If <var>sid</var> is <code>null</code>, abort these steps.</li>
424    <li><a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML string">Validate
425    <var>sid</var> as an <abbr>XML</abbr> string</a>.</li>
426      <li>If <var>sid</var> contains both <code class=char>U+0022</code>
427      <code class=charname>QUOTATION MARK</code> (<code class=char>"</code>) and
428      <code class=char>U+0027</code> <code class=charname>APOSTROPHE</code>
429      (<code class=char>'</code>) characters, raise an
430      <a href="#xml-well-formedness-error" id=wfe-sid-lit><code>xml-well-formedness-error</code></a>.</li>
431      <li>If <var>sid</var> contains at least one <code class=char>U+0023</code>
432      <code class=charname>NUMBER SIGN</code> (<code class=char>#</code>)
433      character, then raise an
434      <a href="#xml-misc-error" id=xme-sid-fragment><code>xml-misc-error</code></a>.</li>
435      <li class=ed>@@ If <var>sid</var> cannot be converted to a URI
436      reference, then raise a fact-level error (xml-misc-warning?).<!--
437      XML 1.0 has no conformance language for system identifier being
438      a URI reference. --></li>
439    </ol>
440    
441    </div>
442    
443    <div class=section id=checking-node>
444    <h3>Checking <code>Node</code></h3>
445    
446  <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
447  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
448  following:</p>  following:</p>
# Line 200  following:</p> Line 450  following:</p>
450  <dt>If <var>n</var> is an <code>Attr</code> node</dt>  <dt>If <var>n</var> is an <code>Attr</code> node</dt>
451    <dd>    <dd>
452      <ol>      <ol>
453      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li><a href="#algorithm-to-validate-an-ncname">Validate the
454      <code>localName</code> attribute value as an <code>NCName</code></a>.</li>      <code>localName</code> attribute value as an <code>NCName</code></a>.</li>
455      <li>If the <code>prefix</code> attribute value is different from      <li>If the <code>prefix</code> attribute value is different from
456      <code>null</code>, then <a href="#algorithm-to-validate-a-ncname">validate      <code>null</code>, then <a href="#algorithm-to-validate-an-ncname">validate
457      the <code>prefix</code> attribute value as an <code>NCName</code></a>.</li>      the <code>prefix</code> attribute value as an <code>NCName</code></a>.</li>
458      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>For each node <dfn id=var-attr-nc><var>n<sub><var>c</var></sub></var></dfn> in the
     a node which is <em>not</em> <code>Text</code> or  
     <code>EntityReference</code> node, then it is a  
     <a href="#xml-well-formedness-error" id=wfe-attr-child><code>xml-well-formedness-error</code></a>.</li>  
     <li>If the <code>childNodes</code> list of <var>n</var> contains  
     an <code>EntityReference</code> node, it is an  
     <a href="#entity-error" id=ee-er-in-attr><code>entity-error</code></a>.</li>  
     <li><a href="#algorithm-to-check-a-node">Check each node</a>, in  
459      <code>childNodes</code> list of <var>n</var>,      <code>childNodes</code> list of <var>n</var>,
460      which is different from <code>EntityReference</code> recursively.</li>        <ol>
461          <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> a
462          <code>Text</code> or <code>EntityReference</code> node, then it is an
463          <a href="#xml-well-formedness-error" id=wfe-attr-child><code>xml-well-formedness-error</code></a>.</li>
464          <li>Otherwise, if <var>n<sub><var>c</var></sub></var> is an
465          <code>EntityReference</code> node, then it is an
466          <a href="#entity-error" id=ee-attr-er><code>entity-error</code></a>.</li>
467          <li>Otherwise,
468          <a href="#algorithm-to-check-a-node" title="check a node">check
469          <var>n<sub><var>c</var></sub></var></a> recusrively.</li>
470          </ol></li>
471        <li>If <code>nodeName</code> attribute of <var>n</var> is
472        <code>xml:space</code> <span class=ed>@@ or {xml namespace}:space ?</span>
473        and <code>value</code> attribute of <var>n</var> is neither
474        <code>default</code> nor <code>preserve</code>, then it is an
475        <a href="#xml-misc-error" id=xme-attr-xml-space><code>xml-misc-error</code></a>.<!--
476        Note that <!ATTLIST e xml:space (default|preserve) "a">...
477        <e xml:space="default"/> is conforming and valid. --></li>
478        <li class=ed>@@ xml:lang value is not a language tag [RFC 3066 or its
479        successor] or an empty string, then xml-misc-warning
480        (a "fact"-level error; not an XML error).</li>
481      <li class=ed>@@ <code>specified</code>,      <li class=ed>@@ <code>specified</code>,
482      <code>manakaiAttributeType</code></li>      <code>manakaiAttributeType</code> (#ValueType Validity constraint: Attribute Value Type)</li>
483        <!-- xml:space MUST be declared to be valid. -->
484        <li>Let <dfn id=var-v><var>v</var></dfn> be the value of the
485        attribute <code>value</code> of <var>n</var>.</li>
486        <li>Validate the <var>n</var> against the <span class=ed>declared
487        type</span> as following:
488          <dl class=switch>
489          <dt class=ed><code>ID_ATTR</code></dt>
490            <dd>
491              <ol>
492              <li><span class=ed>Validate <var>v</var> as an
493              <code>Name</code>.</span>  If it fails, then raise an
494              <a href="#xml-validity-error" id=vc-id-name><code>xml-validity-error</code></a>.</li>
495              <li><span class=ed>If <code>ID</code> <var>v</var> is defined,</span>
496              then raise an  
497              <a href="#xml-validity-error" id=vc-id-duplication><code>xml-validity-error</code></a>.</li>
498              </ol>
499            </dd>
500          <dt class=ed>IDREF_ATTR</dt>
501            <dd>
502              <ol>
503              <li><span class=ed>Validate <var>v</var> as an
504              <code>Name</code>.</span>  If it fails, then raise an
505              <a href="#xml-validity-error" id=vc-idref-name><code>xml-validity-error</code></a>.</li>
506              <li><span class=ed>If <code>ID</code> <var>v</var> is NOT
507              defined,</span> then raise an  
508              <a href="#xml-validity-error" id=vc-idref-match><code>xml-validity-error</code></a>.</li>
509              </ol>
510            </dd>
511          <dt class=ed>IDREFS_ATTR</dt>
512            <dd class=ed>@@</dd>
513          <dt class=ed>ENTITY_ATTR</dt>
514            <dd>
515              <ol>
516              <li><span class=ed>Validate <var>v</var> as an
517              <code>Name</code>.</span>  If it fails, then raise an
518              <a href="#xml-validity-error" id=vc-entname-name><code>xml-validity-error</code></a>.</li>
519              <li><span class=ed>If <code>Entity</code> <var>v</var> is NOT
520              defined,</span> then raise an  
521              <a href="#xml-validity-error" id=vc-entname-match><code>xml-validity-error</code></a>.</li>
522              </ol>
523            </dd>
524          <dt class=ed>ENTITIES_ATTR</dt>
525            <dd class=ed>@@</dd>
526          <dt class=ed>NMTOKEN_ATTR</dt>
527            <dd>
528              <ol>
529              <li><span class=ed>Validate <var>v</var> as an
530              <code>Nmtoken</code>.</span>  If it fails, then raise an
531              <a href="#xml-validity-error" id=vc-nmtok-name><code>xml-validity-error</code></a>.</li>
532              </ol>
533            </dd>
534          <dt class=ed>NMTOKENS_ATTR</dt>
535            <dd class=ed>@@</dd>
536          <dt class=ed>NOTATION_ATTR</dt>
537            <dd class=ed><var>v</var> must be one of enumerated values.
538            If not, then raise an
539            <a href="#xml-validity-error" id=vc-notatn-match><code>xml-validity-error</code></a>.</dd>
540          <dt class=ed>ENUMERATED_ATTR</dt>
541            <dd class=ed><var>v</var> must be one of enumerated values.
542            If not, then raise an
543            <a href="#xml-validity-error" id=vc-enum><code>xml-validity-error</code></a>.</dd>
544          <dt class=ed>@@</dt>
545          </dl>
546        </li>
547        <li>If <span class=ed>type ID and default is NOT #IMPLIED or #REQUIRED</span>, then
548        raise an
549        <a href="#xml-validity-error" id=vc-id-default><code>xml-validity-error</code></a>.</li>
550        <li class=ed>@@ #FixedAttr Validity constraint: Fixed Attribute Default</li>
551        <li class=ed>@@ strict serialization error for U+000D, U+000A, and
552        U+0009 characters, leading/trailing U+0020, and U+0020{2,} string?</li>
553      </ol>      </ol>
554    </dd>    </dd>
555  <dt>If <var>n</var> is an <code>AttributeDefinition</code> node</dt>  <dt>If <var>n</var> is an <code>AttributeDefinition</code> node</dt>
556    <dd class=ed></dd>    <dd>
557        <ol>
558        <li class=ed></li>
559        <li>If <code>nodeName</code> attribute of <var>n</var> is
560        <code>xml:space</code> <span class=ed>@@ or {xml namespace}:space ?</span>
561        and <span class=ed>its declared type is different from (default|preserve),
562        (default), or (preserve)</span>, then raise an
563        <a href="#xml-misc-error" id=xme-at-xml-space><code>xml-misc-error</code></a>.</li>
564        <li>For each node <dfn id=var-ad-nc><var>n<sub><var>c</var></sub></var></dfn> in the
565        <code>childNodes</code> list of <var>n</var>,
566          <ol>
567          <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> a
568          <code>Text</code> or <code>EntityReference</code> node, then it is an
569          <a href="#xml-well-formedness-error" id=wfe-at-child><code>xml-well-formedness-error</code></a>.</li>
570          <li>Otherwise, if <var>n<sub><var>c</var></sub></var> is an
571          <code>EntityReference</code> node, then it is an
572          <a href="#entity-error" id=ee-at-er><code>entity-error</code></a>.</li>
573          <li>Otherwise,
574          <a href="#algorithm-to-check-a-node" title="check a node">check
575          <var>n<sub><var>c</var></sub></var></a> recusrively.</li>
576          </ol></li>
577        <li class=ed>If <code>NOTATION_ATTR</code>, enumerated values MUST
578        be declared.  If not, then raise an
579        <a href="#xml-validity-error" id=vc-notatn-declared><code>xml-validity-error</code></a>.</li>
580        <li class=ed>If <code>NOTATION_ATTR</code> or <code>ENUMERATED_ATTR</code>,
581        values MUST all be distinct.  If not, then raise an
582        <a href="#xml-validity-error" id=vc-no-duplicate-tokens><code>xml-validity-error</code></a>.</li>
583        <li class=ed>If <code>NOTATION_ATTR</code> on an <code>EMPTY</code>
584        element, then raise an
585        <a href="#xml-validity-error" id=vc-no-notation-empty><code>xml-validity-error</code></a>.</li>
586        <li class=ed>@@ #defattrvalid Validity constraint: Attribute Default Value Syntactically Correct</li>
587        </ol>
588      </dd>
589  <dt>If <var>n</var> is a <code>CDATASection</code> node</dt>  <dt>If <var>n</var> is a <code>CDATASection</code> node</dt>
590    <dd>    <dd>
591      <ol>      <ol>
592      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li><a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML string">Validate the
593      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>data</code> attribute value as an <abbr>XML</abbr> character
594      data</a>.</li>      data</a>.</li>
595      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains
596      a string <code>]]></code>, then it is a      a string <code>]]></code>, then raise an
597      <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>
598      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
599      any nodes, they are in      any nodes, they are in
600      <a href="#xml-well-formedness-error" id=wfe-cs-child><code>xml-well-formedness-error</code></a>s.</li>      <a href="#xml-well-formedness-error" id=wfe-cs-child><code>xml-well-formedness-error</code></a>.</li>
601      </ol>      </ol>
602    </dd>    </dd>
603  <dt>If <var>n</var> is a <code>Comment</code> node</dt>  <dt>If <var>n</var> is a <code>Comment</code> node</dt>
604    <dd>    <dd>
605      <ol>      <ol>
606      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li>Raise an
607        <a href="#round-trip-warning" id=rtw-comment><code>round-trip-warning</code></a>.</li>
608        <li><a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML string">Validate the
609      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>data</code> attribute value as an <abbr>XML</abbr> character
610      data</a>.</li>      data</a>.</li>
611      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains
612      a string <code>--</code>, or if it ends with a character      a string <code>--</code>, or if it ends with a character
613      <code>-</code>, then it is a      <code>-</code>, then raise an
614      <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>.<!--
615        "for compatibility" --></li>
616      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
617      any nodes, they are in      any nodes, they are in
618      <a href="#xml-well-formedness-error" id=wfe-comment-child><code>xml-well-formedness-error</code></a>s.</li>      <a href="#xml-well-formedness-error" id=wfe-comment-child><code>xml-well-formedness-error</code></a>.</li>
619      </ol>      </ol>
620    </dd>    </dd>
621  <dt>If <var>n</var> is a <code>Document</code> node</dt>  <dt>If <var>n</var> is a <code>Document</code> node</dt>
# Line 258  following:</p> Line 626  following:</p>
626      then it is an <code class=ed>unknown-error?</code>.</li>      then it is an <code class=ed>unknown-error?</code>.</li>
627      <li>If the <code>xmlEncoding</code> attribute value does <em>not</em>      <li>If the <code>xmlEncoding</code> attribute value does <em>not</em>
628      match to <code>[A-Za-z] ([A-Za-z0-9._] | '-')*</code>      match to <code>[A-Za-z] ([A-Za-z0-9._] | '-')*</code>
629      <span class=ed>@@ formal def</span>, then it is a      <span class=ed>@@ formal def</span>, then it is an
630      <a href="#xml-well-formedness-error" id=wfe-encoding><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-encoding><code>xml-well-formedness-error</code></a>.</li>
631      <li>The <code>childNodes</code> list of <var>n</var> have to      <li>The <code>childNodes</code> list of <var>n</var> have to
632      consist of zero or more <code>Comment</code> and/or      consist of zero or more <code>Comment</code> and/or
# Line 268  following:</p> Line 636  following:</p>
636      <code>ProcessingInstruction</code> nodes, followed by      <code>ProcessingInstruction</code> nodes, followed by
637      an <code>Element</code> node, followed      an <code>Element</code> node, followed
638      by zero or more <code>Comment</code> and/or      by zero or more <code>Comment</code> and/or
639      <code>ProcessingInstruction</code> nodes.  Any violation to this is a      <code>ProcessingInstruction</code> nodes.  Any violation to this is an
640      <a href="#xml-well-formedness-error" id=wfe-document-child><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-document-child><code>xml-well-formedness-error</code></a>.</li>
641      <li><a href="#algorithm-to-check-a-node">Check each node</a>, in      <li>For each node <dfn id=var-document-nc><var>n<sub><var>c</var></sub></var></dfn>
642      <code>childNodes</code> list of <var>n</var>,      in the <code>childNodes</code> list of <var>n</var>,
643      which is different from <code>EntityReference</code> recursively.</li>        <ol>
644          <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> an
645          <code>EntityReference</code> node, then
646          <a href="#algorithm-to-check-a-node" title="check a node">check
647          <var>n<sub><var>c</var></sub></var></a> recursively.</li>
648          </ol></li>
649      <li class=ed>@@ <code>allDeclarationsProcessed</code></li>      <li class=ed>@@ <code>allDeclarationsProcessed</code></li>
650      </ol>      </ol>
651    </dd>    </dd>
652  <dt>If <var>n</var> is a <code>DocumentFragment</code> node</dt>  <dt>If <var>n</var> is a <code>DocumentFragment</code> node</dt>
653    <dd>    <dd>
654      <ol>      <ol>
655      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>For each node <dfn id=var-df-nc><var>n<sub><var>c</var></sub></var></dfn>
656      a node which is <em>not</em> <code>Element</code>,      in the <code>childNodes</code> list of <var>n</var>,
657      <code>Text</code>, <code>CDATASection</code>, <code>Comment</code>,        <ol>
658      <code>ProcessingInstruction</code>, or        <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> an
659      <code>EntityReference</code> node, then it is a        <code>Element</code>, <code>Text</code>, <code>CDATASection</code>,
660      <a href="#xml-well-formedness-error" id=wfe-df-child><code>xml-well-formedness-error</code></a>.</li>        <code>Comment</code>, <code>ProcessingInstruction</code>, or
661      <li>If the <code>childNodes</code> list of <var>n</var> contains        <code>EntityReference</code> node, then it is an
662      an <code>EntityReference</code> node, it is an        <a href="#xml-well-formedness-error" id=wfe-df-child><code>xml-well-formedness-error</code></a>.</li>
663      <a href="#entity-error" id=ee-er-in-df><code>entity-error</code></a>.</li>        <li>Otherwise, if <var>n<sub><var>c</var></sub></var> is an
664      <li><a href="#algorithm-to-check-a-node">Check each node</a>, in        <code>EntityReference</code> node, then it is an
665      <code>childNodes</code> list of <var>n</var>        <a href="#entity-error" id=ee-df-er><code>entity-error</code></a>.</li>
666      which is different from <code>EntityReference</code> recursively.</li>        <li>Otherwise,
667          <a href="#algorithm-to-check-a-node" title="check a node">check
668          <var>n<sub><var>c</var></sub></var></a> recursively.</li>
669          </ol></li>
670      </ol>      </ol>
671    </dd>    </dd>
672  <dt>If <var>n</var> is a <code>DocumentType</code> node</dt>  <dt>If <var>n</var> is a <code>DocumentType</code> node</dt>
673    <dd>    <dd>
674      <ol>      <ol>
675      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li><a href="#algorithm-to-validate-an-ncname">Validate the
676      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>
677      <li>If the <code>publicId</code> attribute value contains any character      <li>Follow the following substeps:
678      that is outside of the range of <code>#x20 | <!--#xD | #xA |-->        <ol>
679      [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%]</code><!-- @@ TODO: formal def -->,        <li>If <code>ownerDocument</code> attribute of <var>n</var> is
680      or contains a leading <code class=char>U+0020</code> character,        <code>null</code>, then abort these substeps.</li>
681      a trailing <code class=char>U+0020</code> character, or a        <li>If <code>documentElement</code> attribute of the node
682      sequence of two or more <code class=char>U+0020</code> characters,        set to <code>ownerDocument</code> attribute of <var>n</var> is
683      then it is a        <code>null</code>, then abort these substeps.</li>
684      <a href="#xml-well-formedness-error" id=wfe-dt-public-id><code>xml-well-formedness-error</code></a>.</li>        <li>If <code>nodeName</code> attribute of the node set to
685      <li>If the <code>systemId</code> attribute value contains        <code>documentElement</code> attribute of the node set to
686      both <code>"</code> and <code>'</code> characters, it is a        <code>ownerDocument</code> attribute of <var>n</var> is
687      <a href="#xml-well-formedness-error" id=wfe-dt-system-id><code>xml-well-formedness-error</code></a>.</li>        different from <code>nodeName</code> of <var>n</var>,
688      <!-- publicId = non-null and systemId = null -->        then raise an
689      <li>If the <code>childNodes</code> list of <var>n</var> contains        <a href="#xml-validity-error" id=vc-roottype><code>xml-validity-error</code></a>.</li></li>
690      a node which is <em>not</em> <code>ProcessingInstruction</code> node,        </ol>
691      then it is a      </li>
692      <a href="#xml-well-formedness-error" id=wfe-dt-child><code>xml-well-formedness-error</code></a>.      <li><a href="#algorithm-to-validate-a-public-identifier" title="validate a public identifier">Validate
693      <span class=ed>@@ ref to manakai's extensions</span></li>      the <code>publicId</code> attribute value as a public identifier</a>.</li>
694      <li><a href="#algorithm-to-check-a-node">Check each node</a>, in      <li><a href="#algorithm-to-validate-a-system-identifier" title="validate a system identifier">Validate
695      <code>childNodes</code> list of <var>n</var>,      the <code>systemId</code> attribute value as a system identifier</a>.</li>
696      which is different from <code>EntityReference</code> recursively.</li>      <li>If the <code>publicId</code> attribute value of <var>n</var> is
697      <li class=ed>@@ <code>entities</code>, <code>notations</code>,      <em>not</em> <code>null</code> and the <code>systemId</code> attribute
698      <code>elementTypes</code>, externally declared?</li>      value of <var>n</var> is <code>null</code>, then raise an
699        <a href="#xml-well-formedness-error" id=wfe-dt-sid><code>xml-well-formedness-error</code></a>.
700        <span class=ed>@@ publicId == null?  Or, publicId == ""</span></li>
701        <li>For each node <dfn id=var-dt-nc><var>n<sub><var>c</var></sub></var></dfn>
702        in the <code>childNodes</code> list of <var>n</var>,
703          <ol>
704          <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> a
705          <code>ProcessingInstruction</code> node, then it is an
706          <a href="#xml-well-formedness-error" id=wfe-dt-child><code>xml-well-formedness-error</code></a>.
707          <span class=ed>@@ ref to manakai's extensions</span></li>
708          <li>Otherwise, <!-- if n_c is not an EntityReference node, -->
709          <a href="#algorithm-to-check-a-node" title="check a node">check
710          <var>n<sub><var>c</var></sub></var></a> recusrively.</li>
711          </ol></li>
712        <li>For each node in the <code>entities</code>, <code>notations</code>,
713        and <code>elementTypes</code> lists of <var>n</var>,
714        <a href="#algorithm-to-check-a-node" title="check a node">check the
715        node</a> recursively.</li>
716        <li class=ed>@@ externally declared?</li>
717      </ol>      </ol>
718    </dd>    </dd>
719  <dt>If <var>n</var> is an <code>Element</code> node</dt>  <dt>If <var>n</var> is an <code>Element</code> node</dt>
720    <dd>    <dd>
721      <ol>      <ol>
722      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li><a href="#algorithm-to-validate-an-ncname">Validate the
723      <code>localName</code> attribute value as an <code>NCName</code></a>.</li>      <code>localName</code> attribute value as an <code>NCName</code></a>.</li>
724      <li>If the <code>prefix</code> attribute value is different from      <li>If the <code>prefix</code> attribute value is different from
725      <code>null</code>, then <a href="#algorithm-to-validate-a-ncname">validate      <code>null</code>, then <a href="#algorithm-to-validate-an-ncname">validate
726      the <code>prefix</code> attribute value as an <code>NCName</code></a>.</li>      the <code>prefix</code> attribute value as an <code>NCName</code></a>.</li>
727      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>For each node <dfn id=var-element-nc><var>n<sub><var>c</var></sub></var></dfn>
728      a node which is <em>not</em> <code>Element</code>,      in the <code>childNodes</code> list of <var>n</var>,
729      <code>Text</code>, <code>CDATASection</code>, <code>Comment</code>,        <ol>
730      <code>ProcessingInstruction</code>, or        <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> an
731      <code>EntityReference</code> node, then it is a        <code>Element</code>,
732      <a href="#xml-well-formedness-error" id=wfe-element-child><code>xml-well-formedness-error</code></a>.</li>        <code>Text</code>, <code>CDATASection</code>, <code>Comment</code>,
733      <li>If the <code>childNodes</code> list of <var>n</var> contains        <code>ProcessingInstruction</code>, or
734      an <code>EntityReference</code> node, it is an        <code>EntityReference</code> node, then it is an
735      <a href="#entity-error" id=ee-er-in-element><code>entity-error</code></a>.</li>        <a href="#xml-well-formedness-error" id=wfe-element-child><code>xml-well-formedness-error</code></a>.</li>
736      <li><a href="#algorithm-to-check-a-node">Check each node</a>, in        <li>Otherwise, if <var>n<sub><var>c</var></sub></var> is an
737      <code>childNodes</code> list of <var>n</var>,        <code>EntityReference</code> node, then it is an
738      which is different from <code>EntityReference</code> recursively.</li>        <a href="#entity-error" id=ee-element-er><code>entity-error</code></a>.</li>
739          <li>Otherwise,
740          <a href="#algorithm-to-check-a-node" title="check a node">check
741          <var>n<sub><var>c</var></sub></var></a> recursively.</li>
742          </ol></li>
743        <li class=ed>@@ #elementvalid Validity constraint: Element Valid</li>
744        <li>Let <var>attrs</var> be the value of the <code>attribute</code>
745        attribute of <var>n</var>.  Check conformance of <var>attrs</var>
746        as following:
747          <ol>
748          <li>If <var>attrs</var> contains an <code>Attr</code> node whose
749          <code>nodeName</code> attribute value is equal to that of another
750          <code>Attr</code> node in <var>attrs</var>, then raise an
751          <a href="#xml-well-formedness-error" id=wfe-uniqattspec><code>xml-well-formedness-error</code></a>.<!--
752          #uniqattspec Well-formedness constraint: Unique Att Spec --></li>
753          <li class=ed>@@ #RequiredAttr Validity constraint: Required Attribute</li>
754          </ol>
755        </li>
756      </ol>      </ol>
757    </dd>    </dd>
758  <dt>If <var>n</var> is an <code>ElementTypeDefinition</code> node</dt>  <dt>If <var>n</var> is an <code>ElementTypeDefinition</code> node</dt>
   <dd class=ed></dd>  
 <dt>If <var>n</var> is an <code>Entity</code> node</dt>  
759    <dd>    <dd>
760      <ol>      <ol>
761      <li>An <a href="#entity-error" id=ee-entity-node><code>entity-error</code></a> <span class=ed>@@ if !notationName</span>.</li>      <li class=ed></li>
     <li><a href="#algorithm-to-validate-a-ncname">Validate the  
     <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>  
     <li>If the <code>publicId</code> attribute value contains any character  
     that is outside of the range of <code>#x20 | <!--#xD | #xA |-->  
     [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%]</code><!-- @@ TODO: formal def -->,  
     or contains a leading <code class=char>U+0020</code> character,  
     a trailing <code class=char>U+0020</code> character, or a  
     sequence of two or more <code class=char>U+0020</code> characters,  
     then it is a  
     <a href="#xml-well-formedness-error" id=wfe-dt-public-id><code>xml-well-formedness-error</code></a>.</li>  
     <li>If the <code>systemId</code> attribute value contains  
     both <code>"</code> and <code>'</code> characters, it is a  
     <a href="#xml-well-formedness-error" id=wfe-dt-system-id><code>xml-well-formedness-error</code></a>.</li>  
     <!-- publicId = non-null and systemId = null -->  
     <li class=ed>@@ <code>notationName</code></li>  
762      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
763      a node which is <em>not</em> <code>Element</code>,      any nodes, they are in
764      <code>Text</code>, <code>CDATASection</code>, <code>Comment</code>,      <a href="#xml-well-formedness-error" id=wfe-et-child><code>xml-well-formedness-error</code></a>.</li>
765      <code>ProcessingInstruction</code>, or      <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>
766      <code>EntityReference</code> node, then it is a      <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>
767      <a href="#xml-well-formedness-error" id=wfe-entity-child><code>xml-well-formedness-error</code></a>.</li>      <li class=ed>@@ #vc-MixedChildrenUnique
768        Validity constraint: No Duplicate Types</li>
769        <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>
770        <li>If there is more than one <code>AttributeDefinition</code> node
771        with <span class=ed>attribute type <code>ID</code></span> in the
772        <code>NamedNodeMap</code> list contained in the
773        <code>attributeDefinitions</code> attribute of <var>n</var>, then raise an
774        <a href="#xml-validity-error" id=vc-one-id-per-el><code>xml-validity-error</code></a>.</li>
775        <li>If there is more than one <code>AttributeDefinition</code> node
776        with <span class=ed>attribute type <code>NOTATION</code></span> in the
777        <code>NamedNodeMap</code> list contained in the
778        <code>attributeDefinitions</code> attribute of <var>n</var>, then raise an
779        <a href="#xml-validity-error" id=vc-one-notation-per><code>xml-validity-error</code></a>.</li>
780        <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>
781        </ol>
782      </dd>
783    <dt>If <var>n</var> is an <code>Entity</code> node whose
784    <code>notationName</code> attribute value is <code>null</code> (i.e. a
785    parsed entity)</dt>
786      <dd>
787        <ol>
788        <li>Raise an
789        <a href="#entity-error" id=ee-entity-node><code>entity-error</code></a>.</li>
790        <li><a href="#algorithm-to-validate-an-ncname">Validate the
791        <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>
792        <li><a href="#algorithm-to-validate-a-public-identifier" title="validate a public identifier">Validate
793        the <code>publicId</code> attribute value as a public identifier</a>.</li>
794        <li><a href="#algorithm-to-validate-a-system-identifier" title="validate a system identifier">Validate
795        the <code>systemId</code> attribute value as a system identifier</a>.</li>
796        <li>If the <code>publicId</code> attribute value of <var>n</var> is
797        <em>not</em> <code>null</code> and the <code>systemId</code> attribute
798        value of <var>n</var> is <code>null</code>, then raise an
799        <a href="#xml-well-formedness-error" id=wfe-entity-sid><code>xml-well-formedness-error</code></a>.</li>
800        <li>For each node <dfn id=var-entity-nc><var>n<sub><var>c</var></sub></var></dfn>
801        in the <code>childNodes</code> list of <var>n</var>,
802          <ol>
803          <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> an
804          <code>Element</code>,
805          <code>Text</code>, <code>CDATASection</code>, <code>Comment</code>,
806          <code>ProcessingInstruction</code>, or <code>EntityReference</code>
807          node, then it is an
808          <a href="#xml-well-formedness-error" id=wfe-entity-child><code>xml-well-formedness-error</code></a>.</li>
809          <li>Otherwise, if <var>n<sub><var>c</var></sub></var> is an
810          <code>EntityReference</code> node, then it is an
811          <a href="#entity-error" id=ee-er-er><code>entity-error</code></a>.</li>
812          <li>Otherwise,
813          <a href="#algorithm-to-check-a-node" title="check a node">check
814          <var>n<sub><var>c</var></sub></var></a> recursively.</li>
815          </ol></li>
816        </ol>
817      </dd>
818    <dt>If <var>n</var> is an <code>Entity</code> node whose
819    <code>notationName</code> attribute value is <em>not</em> <code>null</code>
820    (i.e. an unparsed entity)</dt>
821      <dd>
822        <ol>
823        <li><a href="#algorithm-to-validate-an-ncname">Validate the
824        <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>
825        <li><a href="#algorithm-to-validate-a-public-identifier" title="validate a public identifier">Validate
826        the <code>publicId</code> attribute value as a public identifier</a>.</li>
827        <li><a href="#algorithm-to-validate-a-system-identifier" title="validate a system identifier">Validate
828        the <code>systemId</code> attribute value as a system identifier</a>.</li>
829        <li>If the <code>systemId</code> attribute value of <var>n</var> is
830        <code>null</code>, then raise an
831        <a href="#xml-well-formedness-error" id=wfe-uentity-sid><code>xml-well-formedness-error</code></a>.</li>
832        <li><a href="#algorithm-to-validate-an-ncname">Validate the
833        <code>notationName</code> attribute value of <var>n</var> as an
834        <code>NCName</code></a>.</li>
835        <li class=ed>@@ #not-declared Validity constraint: Notation Declared</li>
836      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
837      an <code>EntityReference</code> node, it is an      any nodes, they are in
838      <a href="#entity-error" id=ee-er-in-er><code>entity-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-uentity-child><code>xml-well-formedness-error</code></a>.</li>
     <li><a href="#algorithm-to-check-a-node">Check each node</a>, in  
     <code>childNodes</code> list of <var>n</var>,  
     which is different from <code>EntityReference</code> recursively.</li>  
839      </ol>      </ol>
840    </dd>    </dd>
841  <dt>If <var>n</var> is an <code>EntityReference</code> node</dt>  <dt>If <var>n</var> is an <code>EntityReference</code> node</dt>
842    <dd>    <dd>
843      <ol>      <ol>
844      <li>An <a href="#entity-error" id=ee-er-node><code>entity-error</code></a>.</li>      <li>An <a href="#entity-error" id=ee-er-node><code>entity-error</code></a>.</li>
845      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li><a href="#algorithm-to-validate-an-ncname">Validate the
846      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>
847      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>For each node <dfn id=var-er-nc><var>n<sub><var>c</var></sub></var></dfn>
848      a node which is <em>not</em> <code>Element</code>,      in the <code>childNodes</code> list of <var>n</var>,
849      <code>Text</code>, <code>CDATASection</code>, <code>Comment</code>,        <ol>
850      <code>ProcessingInstruction</code>, or        <li>If <var>n<sub><var>c</var></sub></var> is <em>not</em> an
851      <code>EntityReference</code> node, then it is a        <code>Element</code>,
852      <a href="#xml-well-formedness-error" id=wfe-er-child><code>xml-well-formedness-error</code></a>.</li>        <code>Text</code>, <code>CDATASection</code>, <code>Comment</code>,
853      <li>If the <code>childNodes</code> list of <var>n</var> contains        <code>ProcessingInstruction</code>, or <code>EntityReference</code>
854      an <code>EntityReference</code> node, it is an        node, then it is an
855      <a href="#entity-error" id=ee-er-in-entity><code>entity-error</code></a>.</li>        <a href="#xml-well-formedness-error" id=wfe-er-child><code>xml-well-formedness-error</code></a>.</li>
856      <li><a href="#algorithm-to-check-a-node">Check each node</a>, in        <li>Otherwise, if <var>n<sub><var>c</var></sub></var> is <em>not</em> an
857      <code>childNodes</code> list of <var>n</var>,        <code>EntityReference</code> node, then it is an
858      which is different from <code>EntityReference</code> recursively.</li>        <a href="#entity-error" id=ee-entity-er><code>entity-error</code></a>.</li>
859          <li>Otherwise,
860          <a href="#algorithm-to-check-a-node" title="check a node">check
861          <var>n<sub><var>c</var></sub></var></a> recursively.</li>
862          </ol></li>
863      </ol>      </ol>
864    </dd>    </dd>
865  <dt>If <var>n</var> is a <code>Notation</code> node</dt>  <dt>If <var>n</var> is a <code>Notation</code> node</dt>
866    <dd>    <dd>
867      <ol>      <ol>
868      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li><a href="#algorithm-to-validate-an-ncname">Validate the
869      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>      <code>nodeName</code> attribute value as an <code>NCName</code></a>.</li>
870      <li>If the <code>publicId</code> attribute value contains any character      <li><a href="#algorithm-to-validate-a-public-identifier" title="validate a public identifier">Validate
871      that is outside of the range of <code>#x20 | <!--#xD | #xA |-->      the <code>publicId</code> attribute value as a public identifier</a>.</li>
872      [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%]</code><!-- @@ TODO: formal def -->,      <li><a href="#algorithm-to-validate-a-system-identifier" title="validate a system identifier">Validate
873      or contains a leading <code class=char>U+0020</code> character,      the <code>systemId</code> attribute value as a system identifier</a>.</li>
     a trailing <code class=char>U+0020</code> character, or a  
     sequence of two or more <code class=char>U+0020</code> characters,  
     then it is a  
     <a href="#xml-well-formedness-error" id=wfe-dt-public-id><code>xml-well-formedness-error</code></a>.</li>  
     <li>If the <code>systemId</code> attribute value contains  
     both <code>"</code> and <code>'</code> characters, it is a  
     <a href="#xml-well-formedness-error" id=wfe-dt-system-id><code>xml-well-formedness-error</code></a>.</li>  
874      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
875      any nodes, they are in      any nodes, they are in
876      <a href="#xml-well-formedness-error" id=wfe-notation-child><code>xml-well-formedness-error</code></a>s.</li>      <a href="#xml-well-formedness-error" id=wfe-notation-child><code>xml-well-formedness-error</code></a>.</li>
877      </ol>      </ol>
878    </dd>    </dd>
879  <dt>If <var>n</var> is a <code>ProcessingInstruction</code> node</dt>  <dt>If <var>n</var> is a <code>ProcessingInstruction</code> node</dt>
880    <dd>    <dd>
881      <ol>      <ol>
882      <li><a href="#algorithm-to-validate-a-ncname">Validate the      <li>If the <code>target</code> attribute value matches to the string
883      <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  
884      <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>
885      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li>Otherwise, <a href="#algorithm-to-validate-an-ncname">validate the
886      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>target</code> attribute value as an <code>NCName</code></a>.</li>
887        <li>Then,
888        <a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML string">validate
889        the <code>data</code> attribute value as an <abbr>XML</abbr> character
890      data</a>.</li>      data</a>.</li>
891      <li>If the <code>data</code> attribute value contains      <li>If the <code>data</code> attribute value contains a string
892      a string <code>?></code>, or starts with either      <code>?></code>, then raise a
893      <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>
894      <code class=char>U+000D</code>, or <code class=char>U+0020</code>      <li>If the <code>data</code> attribute value starts with either
895      character, then it is a      <code class=char>U+0009</code> <code class=charname>CHARACTER
896      <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
897        FEED</code>, <code class=char>U+000D</code> <code class=charname>CARRIAGE
898        RETURN</code>, or <code class=char>U+0020</code>
899        <code class=charname>SPACE</code> character, then raise a
900        <a href="#round-trip-error" id=rte-pi-s><code>round-trip-error</code></a>.</li>
901      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
902      any nodes, they are in      any nodes, then raise an
903      <a href="#xml-well-formedness-error" id=wfe-pi-child><code>xml-well-formedness-error</code></a>s.</li>      <a href="#xml-well-formedness-error" id=wfe-pi-child><code>xml-well-formedness-error</code></a>.</li>
904      </ol>      </ol>
905    </dd>    </dd>
906  <dt>If <var>n</var> is a <code>Text</code> node</dt>  <dt>If <var>n</var> is a <code>Text</code> node</dt>
907    <dd>    <dd>
908      <ol>      <ol>
909      <li><a href="#algorithm-to-validate-an-xml-character-data">Validate the      <li><a href="#algorithm-to-validate-an-xml-character-data" title="validate an XML string">Validate the
910      <code>data</code> attribute value as an <abbr>XML</abbr> character      <code>data</code> attribute value as an <abbr>XML</abbr> character
911      data</a>.</li>      data</a>.</li>
912      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
913      any nodes, they are in      any nodes, they are in
914      <a href="#xml-well-formedness-error" id=wfe-text-child><code>xml-well-formedness-error</code></a>s.</li>      <a href="#xml-well-formedness-error" id=wfe-text-child><code>xml-well-formedness-error</code></a>.</li>
915      </ol>      </ol>
916    </dd>    </dd>
917  <dt>Otherwise</dt>  <dt>Otherwise</dt>
918    <dd><span class=ed>xml-well-formedness-error?  unknown-error?</span></dd>    <dd><span class=ed>xml-well-formedness-error?  unknown-error?</span></dd>
919  </dl>  </dl>
920    
921  <p>The algorithm  </div>
 <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>  
922    
923  </div>  </div>
924    
925  <div class="section" id="examples">  <div id=classes class=section>
926  <h2>Examples</h2>  <h2>Character Classes</h2>
927    
928  <p class=section-info>This section is <em>non$B!>(Bnormative</em>.</p>  <p>This section defines a couple of character classes.
929    These classes are referred to by algorithms specified above.</p>
930    
931  <div class="ed issue">  <p>Character class <dfn id=class-Char10><code>Char10</code></dfn>
932    contains the following characters:</p>
933    <ul>
934    <li><code class=char>U+0009</code> <code class=charname>CHARACTER
935    TABULATION</code></li>
936    <li><code class=char>U+000A</code> <code class=charname>LINE FEED</code></li>
937    <li><code class=char>U+000D</code> <code class=charname>CARRIAGE
938    RETURN</code></li>
939    <li><code class=char>U+0020</code> <code class=charname>SPACE</code>
940    .. <code class=char>U+D7FF</code></li>
941    <li><code class=char>U+E000</code> .. <code class=char>U+FFFD</code>
942    <code class=charname>REPLACEMENT CHARACTER</code></li>
943    <li><code class=char>U+10000</code> .. <code class=char>U+10FFFF</code></li>
944    </ul>
945    <div class="note memo">
946    <p>This character class contains all characters allowed in the production rule
947    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-Char"><code>Char</code></a>
948    of <abbr>XML</abbr> 1.0
949    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
950    </div>
951    
952  <div class="example figure block">  <p>Character class <dfn id=class-CompatChar10><code>CompatChar10</code></dfn>
953  <div class="caption">...</div>  contains the following characters:</p>
954    <ul>
955    <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>
956    </ul>
957    
958    <p>Character class <dfn id=class-ControlChar10><code>ControlChar10</code></dfn>
959    contains the following characters:</p>
960    <ul>
961    <li><code class=char>U+007F</code> <code class=charname>DELETE</code> ..
962    <code class=char>U+0084</code> <code class=charname>INDEX</code></li>
963    <li><code class=char>U+0086</code> <code class=charname>START OF SELECTED
964    AREA</code> .. <code class=char>U+009F</code> <code class=charname>APPLICATION
965    PROGRAM COMMAND</code></li>
966    <li><code class=char>U+FDD0</code> .. <code class=char>U+FDEF</code></li>
967    <li><code class=char>U+1FFFE</code> .. <code class=char>U+1FFFF</code></li>
968    <li><code class=char>U+2FFFE</code> .. <code class=char>U+2FFFF</code></li>
969    <li><code class=char>U+3FFFE</code> .. <code class=char>U+3FFFF</code></li>
970    <li><code class=char>U+4FFFE</code> .. <code class=char>U+4FFFF</code></li>
971    <li><code class=char>U+5FFFE</code> .. <code class=char>U+5FFFF</code></li>
972    <li><code class=char>U+6FFFE</code> .. <code class=char>U+6FFFF</code></li>
973    <li><code class=char>U+7FFFE</code> .. <code class=char>U+7FFFF</code></li>
974    <li><code class=char>U+8FFFE</code> .. <code class=char>U+8FFFF</code></li>
975    <li><code class=char>U+9FFFE</code> .. <code class=char>U+9FFFF</code></li>
976    <li><code class=char>U+AFFFE</code> .. <code class=char>U+AFFFF</code></li>
977    <li><code class=char>U+BFFFE</code> .. <code class=char>U+BFFFF</code></li>
978    <li><code class=char>U+CFFFE</code> .. <code class=char>U+CFFFF</code></li>
979    <li><code class=char>U+DFFFE</code> .. <code class=char>U+DFFFF</code></li>
980    <li><code class=char>U+EFFFE</code> .. <code class=char>U+EFFFF</code></li>
981    <li><code class=char>U+FFFFE</code> .. <code class=char>U+FFFFF</code></li>
982    <li><code class=char>U+10FFFE</code> .. <code class=char>U+10FFFF</code></li>
983    </ul>
984    <div class="note memo">
985    <p>This character class contains the characters listed in the Note in
986    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#charsets">Section 2.2</a>
987    of <abbr>XML</abbr> 1.0
988    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>,
989    as amended by
990    <a href="http://www.w3.org/XML/xml-V10-4e-errata#E02">errata</a>.</p>
991    </div>
992    
993    <p>The character class <dfn id=class-NameStartChar10><code>NameStartChar10</code></dfn>
994    contains the following characters:</p>
995    <ul class=ed>
996    </ul>
997    <div class="note memo">
998    <p>This character class contains all characters allowed as the first character
999    of a string matching to the production rule
1000    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-Name"><code>Name</code></a>
1001    of <abbr>XML</abbr> 1.0
1002    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
1003    </div>
1004    
1005  <pre><code>...</code></pre>  <p>The character class <dfn id=class-NameChar10><code>NameChar10</code></dfn>
1006    contains the following characters:</p>
1007    <ul>
1008    <li>The characters in the character class
1009    <a href="#class-NameStartChar10">NameStartChar10</a>.</li>
1010    <li class=ed></li>
1011    </ul>
1012    <div class="note memo">
1013    <p>This character class contains all characters allowed as the second
1014    character of a string matching to the production rule
1015    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-Name"><code>Name</code></a>
1016    of <abbr>XML</abbr> 1.0
1017    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
1018  </div>  </div>
1019    
1020    <p>The character class <dfn id=class-PubidChar><code>PubidChar</code></dfn>
1021    contains the following characters:</p>
1022    <ul>
1023    <li><code class=char>U+0009</code> <code class=charname>CHARACTER
1024    TABULATION</code></li>
1025    <li><code class=char>U+000A</code> <code class=charname>LINE FEED</code></li>
1026    <li><code class=char>U+000D</code> <code class=charname>CARRIAGE
1027    RETURN</code></li>
1028    <li><code class=char>U+0020</code> <code class=charname>SPACE</code></li>
1029    <li><code class=char>U+0021</code> <code class=charname>EXCLAMATION MARK</code>
1030    (<code class=char>!</code>)</li>
1031    <li><code class=char>U+0023</code> <code class=charname>DOLLAR SIGN</code>
1032    (<code class=char>$</code>)</li>
1033    <li><code class=char>U+0024</code> <code class=charname>NUMBER SIGN</code>
1034    (<code class=char>#</code>)</li>
1035    <li><code class=char>U+0025</code> <code class=charname>PERCENT SIGN</code>
1036    (<code class=char>%</code>)</li>
1037    <li><code class=char>U+0027</code> <code class=charname>APOSTROPHE</code>
1038    (<code class=char>'</code>)</li>
1039    <li><code class=char>U+0028</code> <code class=charname>LEFT PARENTHESIS</code>
1040    (<code class=char>(</code>)</li>
1041    <li><code class=char>U+0029</code> <code class=charname>RIGHT
1042    PARENTHESIS</code> (<code class=char>)</code>)</li>
1043    <li><code class=char>U+002A</code> <code class=charname>ASTERISK</code>
1044    (<code class=char>*</code>)</li>
1045    <li><code class=char>U+002B</code> <code class=charname>PLUS SIGN</code>
1046    (<code class=char>+</code>)</li>
1047    <li><code class=char>U+002C</code> <code class=charname>COMMA</code>
1048    (<code class=char>,</code>)</li>
1049    <li><code class=char>U+002D</code> <code class=charname>HYPHEN-MINUS</code>
1050    (<code class=char>-</code>)</li>
1051    <li><code class=char>U+002E</code> <code class=charname>FULL STOP</code>
1052    (<code class=char>.</code>)</li>
1053    <li><code class=char>U+002F</code> <code class=charname>SOLIDUS</code>
1054    (<code class=char>/</code>)</li>
1055    <li><code class=char>U+003A</code> <code class=charname>COLON</code>
1056    (<code class=char>:</code>)</li>
1057    <li><code class=char>U+003B</code> <code class=charname>SEMICOLON</code>
1058    (<code class=char>;</code>)</li>
1059    <li><code class=char>U+003D</code> <code class=charname>EQUAL SIGN</code>
1060    (<code class=char>=</code>)</li>
1061    <li><code class=char>U+003F</code> <code class=charname>QUESTION MARK</code>
1062    (<code class=char>?</code>)</li>
1063    <li><code class=char>U+0040</code> <code class=charname>COMMERCIAL AT</code>
1064    (<code class=char>@</code>)</li>
1065    <li><code class=char>U+005F</code> <code class=charname>LOW LINE</code>
1066    (<code class=char>_</code>)</li>
1067    </ul>
1068    <div class="note memo">
1069    <p>This character class contains all characters allowed in the production rule
1070    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-PubidChar"><code>PubidChar</code></a>
1071    of <abbr>XML</abbr> 1.0
1072    <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
1073  </div>  </div>
1074    
1075  </div>  </div>
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