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-revision 1.19 by wakaba,
Sat Dec  1 14:51:45 2007 UTC
+revision 1.25 by wakaba,
Sat Mar 29 02:22:57 2008 UTC
 Line 18
  <div class="header">
  <h1>manakai's <abbr>XML</abbr> Conformance Checking</h1>
- <h2>Working Draft <time datetime=2007-12-01>1 December 2007</time></h2>
+ <h2>Working Draft <time datetime=2008-03-29>29 March 2008</time></h2>
  <dl class="versions-uri">
  <dt>This Version</dt>
 Line 42
        >w@suika.fam.cx</a>&gt;</code></dd>
  </dl>
- <p class="copyright" lang="en">&#xA9; <time>2007</time> <a
+ <p class="copyright" lang="en">&#xA9; <time>2007</time>$B!>(B<time>2008</time> <a
      href="http://suika.fam.cx/~wakaba/who?" rel="author">Wakaba</a>.
  Permission is granted to copy, distribute and/or modify this document
  under the terms of the <a rel="license"
 Line 118 
 else in this specification is normative.
  <p><span class=ed>Algorithm is normative but non-normative</span>.
  In addition, the order in which <a href="#errors">errors</a> are
  raised is undefined.</p>
+ <p>This document sometimes cites parts of <abbr>XML</abbr> 1.0 specification
+ by hyperlinks.  When the document being processed is an <abbr>XML</abbr> 1.1
+ document, however, corresponding parts of the <abbr>XML</abbr> 1.1
+ specification should be consulted instead.</p>
  </div>
-Line 209 
 can be easily serialized into a valid XM
+Line 214 
 can be easily serialized into a valid XM
  <div class=ed><p>@@ TODO: #dt-atuseroption at user option
  (MAY or MUST), #dt-compat for compatibility,
- #dt-interop for interoperability</p></div>
+ #dt-interop for interoperability</p>
+ <p>TODO: XML 1.1, XML Namespace 1.0/1.1, xml:base, xml:id
+ </div>
  </div>
  <div class=section id=parsing-xml>
  <h2>Parsing <abbr>XML</abbr> Document</h2>
- <ul>
+ <p>When an <abbr>XML</abbr> document is parsed, the following clauses
- <li>If the <abbr>XML</abbr> document does not begin with an
+ are applied:</p>
- <abbr>XML</abbr> declaration, then raise an
+ <dl class=switch>
- <a href="#xml-misc-recommentation" id=xmr-xml-decl><code>xml-misc-recommendation</code></a>.</li>
+ <dt>For the document
- <li>If the replacement text of an entity declaration is
+   <dd>If the <abbr>XML</abbr> document does not begin with an
- <code>&lt;</code>, then raise an
+   <abbr>XML</abbr> declaration, then the parser <em class=rfc2119>MUST</em>
- <a href="#xml-misc-warning" id=xmw-entity-value-lt><code>xml-misc-warning</code></a>.<!--
+   raise an
+   <a href="#xml-misc-recommentation" id=xmr-xml-decl><code>xml-misc-recommendation</code></a>.
+ <dt>For the document type declaration
+   <dd class=ed>@@ read external entity
+ <dt>For each internal general entity declaration being processed by the parser
+   <dd>If the
+   <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-EntityValue"><code>EntityValue</code></a>
+   part of the general entity declaration contains a bare <code>U+003C</code>
+   <code>LESS-THAN SIGN</code> (<code>&lt;</code>) character, then the parser
+   <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-misc-warning" id=xmw-entity-value-lt><code>xml-misc-warning</code></a>.<!--
  "strongly advised to avoid" in a Note in Section 2.3 of [XML10], [XML11].
- --></li>
+ -->
- <li>If there is an element type declaration whose <code>Name</code>
+ <dt>For each element type declaration being processed by the parser
- value is already declared, then raise an
+   <dd>If there is another processed element type declaration whose
- <a href="#xml-validity-error" id=vc-edunique><code>xml-validity-error</code></a>.</li>
+   <code>Name</code> is equal to the <code>Name</code> of the element type
- <li>If attribute definition whose <code>Name</code> is
+   declaration, then the parser <em class=rfc2119>MUST</em> raise an
- <code>xml:space</code> has <span class=ed>declared type different from
+   <a href="#xml-validity-error" id=vc-edunique><code>xml-validity-error</code></a>.
- (default|preserve), (default), or (preserve)</span>, then raise an
+ <dt>For each attribute definition list declaration being processed by the
- <a href="#xml-misc-error" id=xme-ad-xml-space><code>xml-misc-error</code></a>.
+ parser
- <span class=ed>@@ duplication with
+   <dd>If there is another processed attribute defintion list declaration whose
- <a href="#xml-at-xml-space">#xml-at-xml-space</a>.<!--
+   <code>Name</code> is equal to the <code>Name</code> of the attribute
- <!ATTLIST e xml:space CDATA #IMPLIED xml:space CDATA #IMPLIED> --></span></li>
+   definition list declaration, then the parser <em class=rfc2119>MUST</em>
- <li>If an empty-element tag is used for an element which is <em>not</em>
+   raise an
- declared <code>EMPTY</code>, then raise an
+   <a href="#xml-misc-warning" id=xme-attlist-unique><code>xml-misc-warning</code></a>.
- <a href="#xml-misc-recommentation" id=xmr-emptyelemtag-not-empty><code>xml-misc-recommendation</code></a>.</li>
+   <dd>For each attribute definition in the attribute definition list
- <li>If an empty-element tag is <em>not</em> used for an element which is
+   declaration, if there is another processed attribute definition whose
- declared <code>EMPTY</code>, then raise an
+   <code>Name</code> is equal to the <code>Name</code> of the attribute
- <a href="#xml-misc-recommentation" id=xmr-empty-not-emptyelemtag><code>xml-misc-recommendation</code></a>.</li>
+   definition (whether or not in the same attribute definition list
+   declaration), then the parser <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-misc-warning" id=xme-attrdef-unique><code>xml-misc-warning</code></a>.
+   <!--
+     <q>For interoperability, an XML processor <em class=rfc2119>MAY</em> 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.</q>
+   -->
+ <!--
+   NOTE: <!ATTLIST a xml:space (default) #IMPLIED xml:space CDATA #IMPLIED>
+   will not be warned.
+ -->
+ <dt>For each entity declaration being processed by the parser
+   <dd>If the entity declaration declares a parameter entity and the
+   <code>Name</code> of the entity begins with the string <code>xml</code>
+   (in any combination of upper- and lowercase letters), then the parser
+   <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-misc-warning" id=xmw-reserved-pe-name><code>xml-misc-warning</code></a>.
+   <dd>If the entity declaration contains the <code>EntityValue</code>, then
+   for each occurence of any references to unparsed entities in the
+   <code>EntityValue</code>, the parser <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-misc-error" id=xme-unparsed-in-ev><code>xml-misc-error</code></a>.
+   <!--
+     <q>It is an error for a reference to an unparsed entity to appear in the
+     EntityValue in an entity declaration.</q>
+   -->
+ <dt>For each notation declaration being processed by the parser
+   <dd>If there is another processed notation declaration whose
+   <code>Name</code> is equal to the <code>Name</code> of the notation
+   declaration, then the parser <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-validity-error" id=vc-uniquenotationname><code>xml-validity-error</code></a>.
+   <!-- <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#UniqueNotationName">Validity constraint: Unique Notation Name</a> -->
+ <dt>For each empty-element tag
+   <dd>If the <code>Name</code> of the tag is not declared by a processed
+   element type declaration as <code>EMPTY</code> content, then the parser
+   <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-misc-recommentation" id=xmr-emptyelemtag-not-empty><code>xml-misc-recommendation</code></a>.
+ <dt>For each start-tag
+   <dd>If the <code>Name</code> of the tag is declared by a processed element
+   type declaration as <code>EMPTY</code> content, then the parser
+   <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-misc-recommentation" id=xmr-empty-not-emptyelemtag><code>xml-misc-recommendation</code></a>.
+ <dt>For each parameter entity reference
+   <dd>If the declaration for the entity is not read (i.e. no declaration
+   for the entity is processed or the external entity referenced by the
+   declaration cannot be retrieved), then:
+     <ul>
+     <li>If the parameter entity is contained in a declaration, then the
+     declaration <em class=rfc2119>MUST</em> be ignored <em>except</em> that
+     any error before the parameter entity <em class=rfc2119>MUST</em> be
+     raised as usual.
+     <li>If the parameter entity is contained in the status portion of a
+     conditional section, then the conditional section
+     <em class=rfc2119>MUST</em> be processed as if it were an
+     <code>IGNORE</code>d section.
+     <li>The parser <em class=rfc2119>MUST NOT</em> process any entity or
+     attribute-list declaration after the parameter entity reference in the DTD
+     <em>except</em> when the <code>standalone</code> pseudo-attribute of the
+     XML declaration (if any) is set to <code>yes</code>.
+     <!-- This requirement is enforced for internal DTD subset case in
+     XML 1.0/1.1 specification (section 5.1) but not for any other cases. -->
+     <!-- According to this definition, element type declarations, notation
+     declarations, and PIs ARE processed. -->
+     <li>If the parameter entity reference is the first reference to an entity
+     that is not read, then the parser <em class=rfc2119>MUST</em> raise an
+     <a href="#entity-error" id=ee-unread-pe><code>entity-error</code></a>.
+     <li>The <code>allDeclarationsProcessed</code> <span class=ed>@@ ref</span>
+     attribute of the <code>Document</code> node <em class=rfc2119>MUST</em> be
+     set to <code>false</code>.
+     </ul>
+ <dt>For each general entity reference in an attribute value or in the content
+ of an element
+   <dd>If the declaration for the entity is not read (i.e. no declaration for
+   the entity is processed or the external entity referenced by the declaration
+   cannot be retrieved), then:
+     <ul>
+     <li>If the general entity reference is the first reference to an entity
+     that is not read, then the parser <em class=rfc2119>MUST</em> raise an
+     <a href="#entity-error" id=ee-unread-ge><code>entity-error</code></a>.
+     <span class=ed>@@ entity declared WFC?</span>
+     <li class=ed>An unexpended entity reference node <em class=rfc2119>MUST</em> be inserted to the current node.
+     </ul>
+ </dl>
+ <p class=ed>@@ MUST try to read external entity
+ <p>In addition, the parser has to check whether the
+ following constraints are met.
+ <p><strong>Well-formedness constraints</strong>.  For each violation to
+ one of constraints below, an
+ <a href="#xml-well-formedness-error"><code>xml-well-formedness-error</code></a>
+ <em class=rfc2119>MUST</em> be raised.  The list of well-formedness
+ constraints is below:
+ <ul>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#wfc-PEinInternalSubset">Well-formedness constraint: PEs in Internal Subset</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#GIMatch">Well-formedness constraint: Element Type Match</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#uniqattspec">Well-formedness constraint: Unique Att Spec</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NoExternalRefs">Well-formedness constraint: No External Entity References</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#CleanAttrVals">Well-formedness constraint: No &lt; in Attribute Values</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#wf-Legalchar">Well-formedness constraint: Legal Character</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#textent">Well-formedness constraint: Parsed Entity</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#norecursion">Well-formedness constraint: No Recursion</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#indtd">Well-formedness constraint: In DTD</a>
+ </ul>
+ <p><strong>Validity constraints</strong>.  For each violation to
+ one of constraints below, an
+ <a href="#xml-validity-error"><code>xml-validity-error</code></a>.
+ <em class=rfc2119>MUST</em> be raised.  The list of validity
+ constraints is below:
+ <ul>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#vc-PEinMarkupDecl">Validity constraint: Proper Declaration/PE Nesting</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#vc-PEinGroup">Validity constraint: Proper Group/PE Nesting</a>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#condsec-nesting">Validity constraint: Proper Conditional Section/PE Nesting</a>
+ </ul>
+ <p><strong>Other creteria</strong>.  For each violation to
+ one of constraints below, an
+ <a href="#xml-misc-recommendation"><code>xml-misc-recommendation</code></a>
+ <em class=rfc2119>MUST</em> be raised.  The list of constraints is below:
+ <ul>
+ <li><q>For interoperability, if a parameter-entity reference appears in a
+ <code>choice</code>, <code>seq</code>, or <code>Mixed</code> construct, its
+ replacement text <em class=rfc2119>SHOULD</em> contain at least one non-blank
+ character, and neither the first nor last non-blank character of the
+ replacement text <em class=rfc2119>SHOULD</em> be a connector (<code>|</code>
+ or <code>,</code>).</q>
+ <li><q>External parsed entities <em class=rfc2119>SHOULD</em> each begin with a
+ text declaration.</q>
+ </ul>
  <!--
- #vc-PEinMarkupDecl Validity constraint: Proper Declaration/PE Nesting
- #wfc-PEinInternalSubset Well-formedness constraint: PEs in Internal Subset
- #ExtSubset Well-formedness constraint: External Subset
- #PE-between-Decls Well-formedness constraint: PE Between Declarations
- #GIMatch Well-formedness constraint: Element Type Match
- #uniqattspec Well-formedness constraint: Unique Att Spec
- #NoExternalRefs Well-formedness constraint: No External Entity References
- #CleanAttrVals Well-formedness constraint: No < in Attribute Values
- #vc-PEinGroup Validity constraint: Proper Group/PE Nesting
- "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 ,)."
- "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."
- #condsec-nesting Validity constraint: Proper Conditional Section/PE Nesting
- #wf-Legalchar Well-formedness constraint: Legal Character
- #textent Well-formedness constraint: Parsed Entity
- #norecursion Well-formedness constraint: No Recursion
- #indtd Well-formedness constraint: In DTD
- "External parsed entities SHOULD each begin with a text declaration."
- "It is an error for a reference to an unparsed entity to appear in the EntityValue in an entity declaration."
- #UniqueNotationName Validity constraint: Unique Notation Name
  @@ Need detailed review, but maybe should be in parsing phase
-Line 284 
 declared <code>EMPTY</code>, then raise
+Line 420 
 declared <code>EMPTY</code>, then raise
  "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."
+ @@ We should phrase out what the parser should do where the XML specification
+ left undefined.  For example: Comment must be converted to a Comment node,
+ illegal xml:space value must be preserved, so on.
+ Warn <!ENTITY % xml... ...>
+ -->
+ <p>The parser <em class=rfc2119>MUST</em> raise an
+ <a href="#xml-well-formedness-error" id=wfe-syntax><code>xml-well-formedness-error</code></a>
+ for any failure to match to a production rule in the XML specification.
+ <!--
+   <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#ExtSubset">Well-formedness constraint: External Subset</a>
+   <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#PE-between-Decls">Well-formedness constraint: PE Between Declarations</a>
  -->
- </ul>
  </div>
  <div class="section" id=checking-dom>
-Line 367 
 character that is <em>not</em> in the ch
+Line 516 
 character that is <em>not</em> in the ch
  case combination), then raise an
  <a href="#xml-misc-warning" id=xmw-reserved-name><code>xml-misc-warning</code></a>.
  <span class=ed>@@ except for attribute names <code>xml:lang</code>,
- <code>xml:space</code>, <code>xml:base</code>, <code>xml:id</code>,
+ <code>xml:space</code><!--, <code>xml:base</code>, <code>xml:id</code>,
  <code>xmlns</code>, <code>xmlns:<var>*</var></code>,
- pi name <code>xml-stylesheet</code>.</span><!--
+ pi name <code>xml-stylesheet</code>-->.</span><!--
  "names beginning with a match to (('X'|'x')('M'|'m')('L'|'l')) are reserved for standardization in this or future versions of this specification.":
  xmlns, xml-stylesheet, xml:base and xml:id specifications violate to this sentense!
  --></li>
-Line 393 
 following algorithm <em class=rfc2119>MU
+Line 542 
 following algorithm <em class=rfc2119>MU
  a public identifier (<dfn id=var-pid><var>pid</var></dfn>)</dfn>, the
  following algorithm <em class=rfc2119>MUST</em> be used:</p>
  <ol>
-   <li>If <var>pid</var> is <code>null</code>, abort these steps.</li>
+ <li>If <var>pid</var> is <code>null</code>, abort these steps.</li>
-   <li>If <var>pid</var> contains any character
+ <li>If <var>pid</var> contains a character that is <em>not</em> in the
-   that is outside of the range of <code>#x20 | #xD | #xA |
+ character class <a href="#class-PubidChar"><code>PubidChar</code></a>, then
-   [a-zA-Z0-9] | [-'()+,./:=?;!*#@$_%]</code><!-- @@ TODO: formal def -->,
+ raise an
-   then it is an
+ <a href="#xml-well-formedness-error" id=wfe-pubid-char><code>xml-well-formedness-error</code></a>.</li>
-   <a href="#xml-well-formedness-error" id=wfe-pubid-char><code>xml-well-formedness-error</code></a>.</li>
    <li>If <var>pid</var> contains one of <code class=char>U+0009</code>
    <code class=charname>CHARACTER TABULATION</code>,
    <code class=char>U+000A</code> <code class=charname>CARRIAGE RETURN</code>,
-Line 414 
 following algorithm <em class=rfc2119>MU
+Line 562 
 following algorithm <em class=rfc2119>MU
    <span class=ed>Is this really a roundtripness problem?  XML spec
    does only define the way to match public identifiers in fact, no
    canonical form.</span></li>
-   <li class=ed>@@ Should we check formal-public-identifierness?</li>
  </ol>
  <p>To
-Line 561 
 following:</p>
+Line 708 
 following:</p>
      <li>If <code>nodeName</code> attribute of <var>n</var> is
      <code>xml:space</code> <span class=ed>@@ or {xml namespace}:space ?</span>
      and <span class=ed>its declared type is different from (default|preserve),
-     (default), or (preserve)</span>, then raise an
+     (preserve|default), (default), or (preserve)</span>, then raise an
      <a href="#xml-misc-error" id=xme-at-xml-space><code>xml-misc-error</code></a>.</li>
      <li>For each node <dfn id=var-ad-nc><var>n<sub><var>c</var></sub></var></dfn> in the
      <code>childNodes</code> list of <var>n</var>,
-Line 996 
 as amended by
+Line 1143 
 as amended by
  contains the following characters:</p>
  <ul class=ed>
  </ul>
+ <div class="note memo">
+ <p>This character class contains all characters allowed as the first character
+ of a string matching to the production rule
+ <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-Name"><code>Name</code></a>
+ of <abbr>XML</abbr> 1.0
+ <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
+ </div>
  <p>The character class <dfn id=class-NameChar10><code>NameChar10</code></dfn>
  contains the following characters:</p>
-Line 1004 
 contains the following characters:</p>
+Line 1158 
 contains the following characters:</p>
  <a href="#class-NameStartChar10">NameStartChar10</a>.</li>
  <li class=ed></li>
  </ul>
+ <div class="note memo">
+ <p>This character class contains all characters allowed as the second
+ character of a string matching to the production rule
+ <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-Name"><code>Name</code></a>
+ of <abbr>XML</abbr> 1.0
+ <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
+ </div>
+ <p>The character class <dfn id=class-PubidChar><code>PubidChar</code></dfn>
+ contains the following characters:</p>
+ <ul>
+ <li><code class=char>U+0009</code> <code class=charname>CHARACTER
+ TABULATION</code></li>
+ <li><code class=char>U+000A</code> <code class=charname>LINE FEED</code></li>
+ <li><code class=char>U+000D</code> <code class=charname>CARRIAGE
+ RETURN</code></li>
+ <li><code class=char>U+0020</code> <code class=charname>SPACE</code></li>
+ <li><code class=char>U+0021</code> <code class=charname>EXCLAMATION MARK</code>
+ (<code class=char>!</code>)</li>
+ <li><code class=char>U+0023</code> <code class=charname>DOLLAR SIGN</code>
+ (<code class=char>$</code>)</li>
+ <li><code class=char>U+0024</code> <code class=charname>NUMBER SIGN</code>
+ (<code class=char>#</code>)</li>
+ <li><code class=char>U+0025</code> <code class=charname>PERCENT SIGN</code>
+ (<code class=char>%</code>)</li>
+ <li><code class=char>U+0027</code> <code class=charname>APOSTROPHE</code>
+ (<code class=char>'</code>)</li>
+ <li><code class=char>U+0028</code> <code class=charname>LEFT PARENTHESIS</code>
+ (<code class=char>(</code>)</li>
+ <li><code class=char>U+0029</code> <code class=charname>RIGHT
+ PARENTHESIS</code> (<code class=char>)</code>)</li>
+ <li><code class=char>U+002A</code> <code class=charname>ASTERISK</code>
+ (<code class=char>*</code>)</li>
+ <li><code class=char>U+002B</code> <code class=charname>PLUS SIGN</code>
+ (<code class=char>+</code>)</li>
+ <li><code class=char>U+002C</code> <code class=charname>COMMA</code>
+ (<code class=char>,</code>)</li>
+ <li><code class=char>U+002D</code> <code class=charname>HYPHEN-MINUS</code>
+ (<code class=char>-</code>)</li>
+ <li><code class=char>U+002E</code> <code class=charname>FULL STOP</code>
+ (<code class=char>.</code>)</li>
+ <li><code class=char>U+002F</code> <code class=charname>SOLIDUS</code>
+ (<code class=char>/</code>)</li>
+ <li><code class=char>U+0030</code> <code class=charname>DIGIT ZERO</code>
+ (<code class=char>0</code>) .. <code class=char>U+0039</code>
+ <code class=charname>DIGIT NINE</code> (<code class=char>9</code>)</li>
+ <li><code class=char>U+003A</code> <code class=charname>COLON</code>
+ (<code class=char>:</code>)</li>
+ <li><code class=char>U+003B</code> <code class=charname>SEMICOLON</code>
+ (<code class=char>;</code>)</li>
+ <li><code class=char>U+003D</code> <code class=charname>EQUAL SIGN</code>
+ (<code class=char>=</code>)</li>
+ <li><code class=char>U+003F</code> <code class=charname>QUESTION MARK</code>
+ (<code class=char>?</code>)</li>
+ <li><code class=char>U+0040</code> <code class=charname>COMMERCIAL AT</code>
+ (<code class=char>@</code>)</li>
+ <li><code class=char>U+0041</code> <code class=charname>LATIN CAPITAL LETTER
+ A</code> (<code class=char>A</code>) .. <code class=char>U+005A</code>
+ <code class=charname>LATIN CAPITAL LETTER Z</code>
+ (<code class=char>Z</code>)</li>
+ <li><code class=char>U+005F</code> <code class=charname>LOW LINE</code>
+ (<code class=char>_</code>)</li>
+ <li><code class=char>U+0061</code> <code class=charname>LATIN CAPITAL LETTER
+ A</code> (<code class=char>A</code>) .. <code class=char>U+007A</code>
+ <code class=charname>LATIN CAPITAL LETTER Z</code>
+ (<code class=char>Z</code>)</li>
+ </ul>
+ <div class="note memo">
+ <p>This character class contains all characters allowed in the production rule
+ <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-PubidChar"><code>PubidChar</code></a>
+ of <abbr>XML</abbr> 1.0
+ <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>]</cite>.</p>
+ </div>
  </div>

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