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-revision 1.25 by wakaba,
Sat Mar 29 02:22:57 2008 UTC
+revision 1.28 by wakaba,
Sat Mar 29 11:46:02 2008 UTC
 Line 92 
 normative version.</p>
  <p class=section-info>This section is <em>non$B!>(Bnormative</em>.</p>
- <div class="issue ed">...</div>
+ <div class="issue ed">...
+ <p>Much of invalid (well-formed or not) XML document parsing and XML document
+ / XML DOM conformance is left undefined so that this document provides a
+ guideline for conformance checkers.
+ </div>
  </div>
-Line 210 
 can be easily serialized into a valid XM
+Line 215 
 can be easily serialized into a valid XM
    violate to any well$B!>(Bformedness constraint in XML
    specification <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>,
    <a href="#ref-XML11">XML11</a>]</cite>.</p></dd>
+ <dt><dfn id=misc-info><code>misc-info</code></dfn>
+   <dd><p>A <code>misc-info</code> is raised when some status information
+   on parsing or checking process that are considered useful for debugging
+   and so on is available.  It by no means implies the non-conformance of
+   the document.
  </dl>
  <div class=ed><p>@@ TODO: #dt-atuseroption at user option
-Line 217 
 can be easily serialized into a valid XM
+Line 227 
 can be easily serialized into a valid XM
  #dt-interop for interoperability</p>
  <p>TODO: XML 1.1, XML Namespace 1.0/1.1, xml:base, xml:id
+ <p>TODO: XML "error"/"fatal error" is not always non-conforming (only
+ when MUST or SHOULD).
  </div>
+ <p>The parser <em class=rfc2119>MAY</em> continue the parsing of the document
+ even after a fatal error (as defined by the relavant specification) is
+ encountered.  How the parsing ought to be continued is not defined by this
+ specification.
+   <div class="note memo informative">
+   <p>It is expected that the XML5 specification <span class=ed>@@ ref</span>
+   will define how the parser has to convert any string into DOM tree
+   completely.
+   </div>
  </div>
  <div class=section id=parsing-xml>
-Line 227 
 can be easily serialized into a valid XM
+Line 251 
 can be easily serialized into a valid XM
  <p>When an <abbr>XML</abbr> document is parsed, the following clauses
  are applied:</p>
  <dl class=switch>
+ <dt>For each external entity (including the document entity and the external
+ subset entity, if any)
+   <dd>If there is a byte sequence that are not legal in the encoding in use,
+   then the parser <em class=rfc2119>MUST</em> raise an
+   <a href="#xml-misc-error" id=xme-illegal-bytes><code>xml-misc-error</code></a>.
+   <!--
+      <q>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.</q>
+   -->
+   <dd>If it is the document entity or a general entity, then:
+     <ul>
+     <li>If the input byte sequence for the entity begins with the
+     <abbr title="BYTE ORDER MARK" class=charname>BOM</abbr>, then the parser
+     <em class=rfc2119>MUST</em> set the <span class=ed>BOM flag</span> of
+     the node corresponding to the entity (the <code>Document</code> node
+     for the document entity or an <code>Entity</code> node for a general
+     entity) to <code>true</code>.
+     <!--
+       <q>Entities encoded in UTF-16 MUST and entities encoded in UTF-8 MAY
+       begin with the Byte Order Mark</q>
+     -->
+     <span class=ed>@@ flag must be checked later</span>
+     <!-- <?xml encoding=""?> must be reflected to xmlEncoding; this should be
+     enforced by DOM Core spec. -->
+     </ul>
+   <dd>If it is a parameter entity or the external subset entity, then:
+     <ul>
+     <li>If the character encoding of the entity is <code>UTF-16</code> but
+     the input byte stream for the entity does not begin with the
+     <abbr title="BYTE ORDER MARK" class=charname>BOM</abbr>, then the parser
+     <em class=rfc2119>MUST</em> raise an
+     <a href="#xml-misc-error" id=xme-pe-bom><code>xml-misc-error</code></a>.
+     <li class=ed>@@ encoding="" preferred name?
+ <!--
+ "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."
+ In addition, this should be checked later for Document and Entity nodes.
+ -->
+     </ul>
  <dt>For the document
    <dd>If the <abbr>XML</abbr> document does not begin with an
    <abbr>XML</abbr> declaration, then the parser <em class=rfc2119>MUST</em>
    raise an
    <a href="#xml-misc-recommentation" id=xmr-xml-decl><code>xml-misc-recommendation</code></a>.
+   <dd>If the document does not contain the document type declaration, or
+   if it does but the document type definition does not contain entity
+   declaration for any of <code>amp</code>, <code>lt</code>, <code>gt</code>,
+   <code>apos</code>, or <code>quot</code>, then the parser
+   <em class=rfc2119>MUST</em> raise
+   <a href="#xml-misc-recommentation" id=xmr-predefined-decl><code>xml-misc-recommendation</code></a>(s).
+   <!--
+     <q>For interoperability, valid documents SHOULD declare the entities
+     amp, lt, gt, apos, quot, in the form specified in 4.6 Predefined
+     Entities.</q>
+   -->
  <dt>For the document type declaration
    <dd class=ed>@@ read external entity
+   <dd>The <code>entities</code> attribute of the <code>DocumentType</code>
+   node <em class=rfc2119>MUST</em> contain a <code>NamedNodeMap</code> object
+   whose first five items are as follows:
+     <ol start=0>
+     <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
+     is <code>amp</code>.  It contains a <code>Text</code> node whose
+     <code>data</code> attribute is set to <code>&amp;</code>.
+     <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
+     is <code>lt</code>.  It contains a <code>Text</code> node whose
+     <code>data</code> attribute is set to <code>&lt;</code>.
+     <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
+     is <code>gt</code>.  It contains a <code>Text</code> node whose
+     <code>data</code> attribute is set to <code>></code>.
+     <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
+     is <code>quot</code>.  It contains a <code>Text</code> node whose
+     <code>data</code> attribute is set to <code>"</code>.
+     <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
+     is <code>apos</code>.  It contains a <code>Text</code> node whose
+     <code>data</code> attribute is set to <code>'</code>.
+     </ol>
  <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>
-Line 273 
 parser
+Line 372 
 parser
  -->
  <dt>For each entity declaration being processed by the parser
-   <dd>If the entity declaration declares a parameter entity and the
+   <dd>Handle as follows:
-   <code>Name</code> of the entity begins with the string <code>xml</code>
+     <ol>
-   (in any combination of upper- and lowercase letters), then the parser
+     <li><p>If the entity declaration declares a general entity, the following
-   <em class=rfc2119>MUST</em> raise an
+     is applied:
-   <a href="#xml-misc-warning" id=xmw-reserved-pe-name><code>xml-misc-warning</code></a>.
+       <dl>
-   <dd>If the entity declaration contains the <code>EntityValue</code>, then
+       <dt>If the <code>Name</code> is <code>lt</code> or <code>amp</code>
-   for each occurence of any references to unparsed entities in the
+         <dd><p>If the entity declaration does not declare an internal entity,
-   <code>EntityValue</code>, the parser <em class=rfc2119>MUST</em> raise an
+         or if the replacement text of the entity is not the escaped form of
-   <a href="#xml-misc-error" id=xme-unparsed-in-ev><code>xml-misc-error</code></a>.
+         <code>&lt;</code> (if <code>lt</code>) or <code>&amp;</code> (if
-   <!--
+         <code>amp</code>), then the parser <em class=rfc2119>MUST</em> raise an
-     <q>It is an error for a reference to an unparsed entity to appear in the
+         <a href="#xml-misc-error" id=xme-double-escape><code>xml-misc-error</code></a>.
-     EntityValue in an entity declaration.</q>
-   -->
+           <div class="note memo informative">
+           <p>In other word, the character in the <code>EntityValue</code>
+           has to be double-escaped.
+           </div>
+       <dt>If the <code>Name</code> is <code>gt</code>, <code>quot</code>, or
+       <code>apos</code>
+         <dd><p>If the entity declaration does not declare an internal entity,
+         or if the replacement text of the entity is not equal to or not the
+         escaped form of <code>></code> (if <code>gt</code>), <code>"</code> (if
+         <code>quot</code>), or <code>'</code> (if <code>apos</code>), then the
+         parser <em class=rfc2119>MUST</em> raise an
+         <a href="#xml-misc-error" id=xme-single-escape><code>xml-misc-error</code></a>.
+           <div class="note memo informative">
+           <p>In other word, the character in the <code>EntityValue</code>
+           has to be single- or double-escaped.
+           </div>
+       </dl>
+       <!--
+         <q>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).</q>
+       -->
+     <li><p>If the entity declaration has to be ignored since there has already
+     been declared an entity with the same <code>Name</code> as the declaration,
+     then the parser <em class=rfc2119>MUST</em> raise a
+     <a href="#misc-info" id=mi-ent-unique><code>misc-info</code></a>
+     and abort these steps.
+     <div class="informative note memo">
+     <p>Five predefined entities, i.e. <code>amp</code>, <code>lt</code>,
+     <code>gt</code>, <code>quot</code>, and <code>apos</code>, are always
+     declared implicitly and therefore any declaration for such an entity
+     always raises an
+     <a href="#misc-info" id=mi-ent-unique><code>misc-info</code></a>.
+     </div>
+     <li><p>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>.
+     <li><p>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>
+     -->
+     <li><p>If the entity declaration declares a general entity, then an
+     <code>Entity</code> node <em class=rfc2119>MUST</em> be created and
+     appended to the <code>NamedNodeMap</code> object in the
+     <code>entities</code> attribute of the <code>DocumentType</code> node.
+     <p class=ed>Read the external entity
+     <p>If the replacement text of the entity is read, then parse the
+     replacement text as if it were referenced from the content of an
+     element (with no namespace bindings).  If no <span class=ed>@@ parse error</span>
+     is raised by the parsing process, then the nodes generated by the
+     parsing <em class=rfc2119>MUST</em> be appended to the <code>Entity</code>
+     node.  The parse error <em class=rfc2119>MUST NOT</em> be propagated to
+     the entire parsing process.  Other kinds of errors
+     <em class=rfc2119>MUST</em> be propagated.  The first parse error
+     <em class=rfc2119>MUST</em> abort the internal parsing process.
+     <span class=ed>@@ better wording</span>
+     <p class=ed>@@ prop
+     <p>Then, the <code>Entity</code> node and its descendant
+     <em class=rfc2119>MUST</em> be marked as read-only.
+   </ol>
  <dt>For each notation declaration being processed by the parser
    <dd>If there is another processed notation declaration whose
-Line 304 
 parser
+Line 475 
 parser
    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 attribute
+   <dd><p>The parser <em class=rfc2119>MUST</em> set the normalized value of
+   the attribute to the <code>value</code> attribute of the <code>Attr</code>
+   node created for the attribute.
+     <div class="note memo informative">
+     <p>That is, any entity reference has to be expanded.  Unexpanded entity
+     references in attribute values are discarded.
+     </div>
+ <dt>For each <code>xml:space</code> attribute
+   <dd>The parser <em class=rfc2119>MUST</em> set the normalized value of
+   the <code>xml:space</code> attribute to the <code>value</code> attribute
+   of the <code>Attr</code> node created for the attribute even if the
+   normalized value is different from <code>default</code> or
+   <code>preserve</code>.
+   <!-- In XML 1.0/1.1 specification, the attribute specification MAY be
+   ignored. -->
  <dt>For each parameter entity reference
-   <dd>If the declaration for the entity is not read (i.e. no declaration
+   <dd><p>Process as follows:
-   for the entity is processed or the external entity referenced by the
+     <ol>
-   declaration cannot be retrieved), then:
+     <li>If the declaration for the entity is <em>not</em> processed,
+     then:
+       <dl class=switch>
+       <dt>If the document contains no external entity or if the document
+       contains the <code>standalone</code> pseudo-attribute set to
+       <code>yes</code><!-- or the document contains no DTD -->
+         <dd>The parser <em class=rfc2119>MUST</em> raise an
+         <a href="#xml-well-formedness-error" id=wf-entdeclared-pe><code>xml-well-formedness-error</code></a>.
+       <dt>Otherwise
+         <dd>The parser <em class=rfc2119>MUST</em> raise an
+         <a href="#xml-validity-error" id=vc-entdeclared-pe><code>xml-validity-error</code></a>.
+       </dl>
+     <li>If the declaration for the entity <em>is</em> processed but the
+     referenced entity cannot be retrieved, then the parser
+     <em class=rfc2119>MUST</em> raise an
+     <span class=ed>@@ ??-error</span>.
+     </ol>
+     <p>In any of two cases above, process as follows:
      <ul>
-     <li>If the parameter entity is contained in a declaration, then the
+     <li>If the parameter entity reference is contained in a declaration, then
-     declaration <em class=rfc2119>MUST</em> be ignored <em>except</em> that
+     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
+     <li>If the parameter entity reference is contained in the status portion of
-     conditional section, then the conditional section
+     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
-Line 335 
 parser
+Line 541 
 parser
      </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
+   <dd><p>Process as follows:
-   the entity is processed or the external entity referenced by the declaration
+     <ol>
-   cannot be retrieved), then:
+     <li>If the <code>Name</code> of the entity reference is either
+     <code>amp</code>, <code>lt</code>, <code>gt</code>, <code>quot</code>,
+     or <code>apos</code>, then abort these steps.
+     <li>If the declaration for the entity is <em>not</em> processed,
+     then:
+       <dl class=switch>
+       <dt>If the document contains no external entity or if the document
+       contains the <code>standalone</code> pseudo-attribute set to
+       <code>yes</code><!-- or the document contains no DTD -->
+         <dd>The parser <em class=rfc2119>MUST</em> raise an
+         <a href="#xml-well-formedness-error" id=wf-entdeclared-ge><code>xml-well-formedness-error</code></a>.
+       <dt>Otherwise
+         <dd>The parser <em class=rfc2119>MUST</em> raise an
+         <a href="#xml-validity-error" id=vc-entdeclared-ge><code>xml-validity-error</code></a>.
+       </dl>
+     <li>If the declaration for the entity <em>is</em> processed but the
+     referenced entity cannot be retrieved, then the parser
+     <em class=rfc2119>MUST</em> raise an
+     <span class=ed>@@ ??-error</span>.
+     </ol>
+     <p>In any of two cases above, process as follows:
      <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
-Line 345 
 of an element
+Line 572 
 of an element
      <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>
+ <dt>For each comment <em>outside</em> of document type declaration
+   <dd>A <code>Comment</code> node <em class=rfc2119>MUST</em> be created
+   and inserted appropriately.
+   <!-- In XML 1.0/1.1 spec, this is optional. -->
  </dl>
- <p class=ed>@@ MUST try to read external entity
+ <p>The parser <em class=rfc2119>MUST</em> try to read any entity referenced
+ by general or parameter entity references, the external subset entity, if any,
+ and any general entity declared in the document type definition.
  <p>In addition, the parser has to check whether the
  following constraints are met.
-Line 378 
 constraints is below:
+Line 612 
 constraints is below:
  <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>
+ <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#vc-check-rmd">Validity constraint: Standalone Document Declaration</a>
  </ul>
  <p><strong>Other creteria</strong>.  For each violation to
-Line 395 
 or <code>,</code>).</q>
+Line 630 
 or <code>,</code>).</q>
  text declaration.</q>
  </ul>
+ <p>The parser <em class=rfc2119>MUST</em> act as if it is a
- <!--
+ <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#dt-validating">validating
+ XML processor</a> for the informing of white space appearing in
+ <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#dt-elemcontent">element
- @@ Need detailed review, but maybe should be in parsing phase
+ content</a> (See
+ <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#sec-white-space">Section
- #vc-check-rmd Validity constraint: Standalone Document Declaration
+.10</a> of the XML specification).
- @@ Need dtailed review
+   <div class="note memo informative">
+   <p>In other word, the <code>isElementContentWhitespace</code> attribute
- #wf-entdeclared Well-formedness constraint: Entity Declared
+   of <code>Text</code> nodes has to be set appropriately.  Note that the
- #vc-entdeclared Validity constraint: Entity Declared
+   value of the attribute will be set to <code>false</code> for any
- "For interoperability, valid documents SHOULD declare the entities amp, lt, gt, apos, quot, in the form specified in 4.6 Predefined Entities."
+   <code>Text</code> node in the content of an element whose declaration
- "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)."
+   is not processed.
+   </div>
- @@ flaged and then reported in DOM check phase
- "Entities encoded in UTF-16 MUST and entities encoded in UTF-8 MAY begin with the Byte Order Mark"
- "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"
- "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."
- @@ in parsing phase
- "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.
+ for any failure for matching 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>
  -->
+ <!--
+   Inpossible to test:
+     "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"
+ -->
  </div>
  <div class="section" id=checking-dom>
-Line 863 
 following:</p>
+Line 1088 
 following:</p>
      <a href="#algorithm-to-check-a-node" title="check a node">check the
      node</a> recursively.</li>
      <li class=ed>@@ externally declared?</li>
+     <li>If the <code>NamedNodeMap</code> object in the <code>entities</code>
+     attribute of <var>n</var> does not contain <code>Entity</code> nodes
+     whose <code>nodeName</code> attribute are <code>amp</code>,
+     <code>lt</code>, <code>gt</code>, <code>apos</code>, and <code>quot</code>
+     then raise
+     <a href="#xml-misc-recommentation" id=xmr-predefined><code>xml-misc-recommendation</code></a>(s).
      </ol>
    </dd>
  <dt>If <var>n</var> is an <code>Element</code> node</dt>
-Line 1050 
 parsed entity)</dt>
+Line 1281 
 parsed entity)</dt>
      <li>If the <code>childNodes</code> list of <var>n</var> contains
      any nodes, then raise an
      <a href="#xml-well-formedness-error" id=wfe-pi-child><code>xml-well-formedness-error</code></a>.</li>
+     <li class=ed>@@ Warn if not declared
      </ol>
    </dd>
  <dt>If <var>n</var> is a <code>Text</code> node</dt>

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