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revision 1.22 by wakaba, Sun Mar 16 12:33:53 2008 UTC revision 1.27 by wakaba, Sat Mar 29 10:12:46 2008 UTC
# Line 18  Line 18 
18    
19  <div class="header">  <div class="header">
20  <h1>manakai's <abbr>XML</abbr> Conformance Checking</h1>  <h1>manakai's <abbr>XML</abbr> Conformance Checking</h1>
21  <h2>Working Draft <time datetime=2008-03-16>16 March 2008</time></h2>  <h2>Working Draft <time datetime=2008-03-29>29 March 2008</time></h2>
22    
23  <dl class="versions-uri">  <dl class="versions-uri">
24  <dt>This Version</dt>  <dt>This Version</dt>
# Line 92  normative version.</p> Line 92  normative version.</p>
92    
93  <p class=section-info>This section is <em>non$B!>(Bnormative</em>.</p>  <p class=section-info>This section is <em>non$B!>(Bnormative</em>.</p>
94    
95  <div class="issue ed">...</div>  <div class="issue ed">...
96    
97    <p>Much of invalid (well-formed or not) XML document parsing and XML document
98    / XML DOM conformance is left undefined so that this document provides a
99    guideline for conformance checkers.
100    </div>
101    
102    
103  </div>  </div>
# Line 210  can be easily serialized into a valid XM Line 215  can be easily serialized into a valid XM
215    violate to any well$B!>(Bformedness constraint in XML    violate to any well$B!>(Bformedness constraint in XML
216    specification <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>,    specification <cite class="bibref normative">[<a href="#ref-XML10">XML10</a>,
217    <a href="#ref-XML11">XML11</a>]</cite>.</p></dd>    <a href="#ref-XML11">XML11</a>]</cite>.</p></dd>
218    <dt><dfn id=misc-info><code>misc-info</code></dfn>
219      <dd><p>A <code>misc-info</code> is raised when some status information
220      on parsing or checking process that are considered useful for debugging
221      and so on is available.  It by no means implies the non-conformance of
222      the document.
223  </dl>  </dl>
224    
225  <div class=ed><p>@@ TODO: #dt-atuseroption at user option  <div class=ed><p>@@ TODO: #dt-atuseroption at user option
226  (MAY or MUST), #dt-compat for compatibility,  (MAY or MUST), #dt-compat for compatibility,
227  #dt-interop for interoperability</p></div>  #dt-interop for interoperability</p>
228    
229    <p>TODO: XML 1.1, XML Namespace 1.0/1.1, xml:base, xml:id
230    
231    <p>TODO: XML "error"/"fatal error" is not always non-conforming (only
232    when MUST or SHOULD).
233    </div>
234    
235    <p>The parser <em class=rfc2119>MAY</em> continue the parsing of the document
236    even after a fatal error (as defined by the relavant specification) is
237    encountered.  How the parsing ought to be continued is not defined by this
238    specification.
239    
240      <div class="note memo informative">
241      <p>It is expected that the XML5 specification <span class=ed>@@ ref</span>
242      will define how the parser has to convert any string into DOM tree
243      completely.
244      </div>
245    
246  </div>  </div>
247    
# Line 223  can be easily serialized into a valid XM Line 250  can be easily serialized into a valid XM
250    
251  <p>When an <abbr>XML</abbr> document is parsed, the following clauses  <p>When an <abbr>XML</abbr> document is parsed, the following clauses
252  are applied:</p>  are applied:</p>
253  <dl>  <dl class=switch>
254  <dt>For each document  <dt>For each external entity (including the document entity and the external
255    subset entity, if any)
256      <dd>If there is a byte sequence that are not legal in the encoding in use,
257      then the parser <em class=rfc2119>MUST</em> raise an
258      <a href="#xml-misc-error" id=xme-illegal-bytes><code>xml-misc-error</code></a>.
259      <!--
260         <q>It is a fatal error when an XML processor encounters an entity with an
261         encoding that it is unable to process. It is a fatal error if an XML
262         entity is determined (via default, encoding declaration, or higher-level
263         protocol) to be in a certain encoding but contains byte sequences that are
264         not legal in that encoding.</q>
265      -->
266    
267      <dd>If it is the document entity or a general entity, then:
268        <ul>
269        <li>If the input byte sequence for the entity begins with the
270        <abbr title="BYTE ORDER MARK" class=charname>BOM</abbr>, then the parser
271        <em class=rfc2119>MUST</em> set the <span class=ed>BOM flag</span> of
272        the node corresponding to the entity (the <code>Document</code> node
273        for the document entity or an <code>Entity</code> node for a general
274        entity) to <code>true</code>.
275        <!--
276          <q>Entities encoded in UTF-16 MUST and entities encoded in UTF-8 MAY
277          begin with the Byte Order Mark</q>
278        -->
279        <span class=ed>@@ flag must be checked later</span>
280        <!-- <?xml encoding=""?> must be reflected to xmlEncoding; this should be
281        enforced by DOM Core spec. -->
282        </ul>
283      <dd>If it is a parameter entity or the external subset entity, then:
284        <ul>
285        <li>If the character encoding of the entity is <code>UTF-16</code> but
286        the input byte stream for the entity does not begin with the
287        <abbr title="BYTE ORDER MARK" class=charname>BOM</abbr>, then the parser
288        <em class=rfc2119>MUST</em> raise an
289        <a href="#xml-misc-error" id=xme-pe-bom><code>xml-misc-error</code></a>.
290        <li class=ed>@@ encoding="" preferred name?
291    <!--
292    "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."
293    
294    In addition, this should be checked later for Document and Entity nodes.
295    -->
296        </ul>
297    
298    <dt>For the document
299    <dd>If the <abbr>XML</abbr> document does not begin with an    <dd>If the <abbr>XML</abbr> document does not begin with an
300    <abbr>XML</abbr> declaration, then the parser <em class=rfc2119>MUST</em>    <abbr>XML</abbr> declaration, then the parser <em class=rfc2119>MUST</em>
301    raise an    raise an
302    <a href="#xml-misc-recommentation" id=xmr-xml-decl><code>xml-misc-recommendation</code></a>.    <a href="#xml-misc-recommentation" id=xmr-xml-decl><code>xml-misc-recommendation</code></a>.
303  <dt>For each internal general entity declaration processed by the parser    <dd>If the document does not contain the document type declaration, or
304      if it does but the document type definition does not contain entity
305      declaration for any of <code>amp</code>, <code>lt</code>, <code>gt</code>,
306      <code>apos</code>, or <code>quot</code>, then the parser
307      <em class=rfc2119>MUST</em> raise
308      <a href="#xml-misc-recommentation" id=xmr-predefined-decl><code>xml-misc-recommendation</code></a>(s).
309      <!--
310        <q>For interoperability, valid documents SHOULD declare the entities
311        amp, lt, gt, apos, quot, in the form specified in 4.6 Predefined
312        Entities.</q>
313      -->
314    <dt>For the document type declaration
315      <dd class=ed>@@ read external entity
316      <dd>The <code>entities</code> attribute of the <code>DocumentType</code>
317      node <em class=rfc2119>MUST</em> contain a <code>NamedNodeMap</code> object
318      whose first five items are as follows:
319        <ol start=0>
320        <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
321        is <code>amp</code>.  It contains a <code>Text</code> node whose
322        <code>data</code> attribute is set to <code>&amp;</code>.
323        <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
324        is <code>lt</code>.  It contains a <code>Text</code> node whose
325        <code>data</code> attribute is set to <code>&lt;</code>.
326        <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
327        is <code>gt</code>.  It contains a <code>Text</code> node whose
328        <code>data</code> attribute is set to <code>></code>.
329        <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
330        is <code>quot</code>.  It contains a <code>Text</code> node whose
331        <code>data</code> attribute is set to <code>"</code>.
332        <li>An <code>Entity</code> node whose <code>nodeName</code> attribute
333        is <code>apos</code>.  It contains a <code>Text</code> node whose
334        <code>data</code> attribute is set to <code>'</code>.
335        </ol>
336    <dt>For each internal general entity declaration being processed by the parser
337    <dd>If the    <dd>If the
338    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-EntityValue"><code>EntityValue</code></a>    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NT-EntityValue"><code>EntityValue</code></a>
339    part of the general entity declaration contains a bare <code>U+003C</code>    part of the general entity declaration contains a bare <code>U+003C</code>
# Line 238  are applied:</p> Line 342  are applied:</p>
342    <a href="#xml-misc-warning" id=xmw-entity-value-lt><code>xml-misc-warning</code></a>.<!--    <a href="#xml-misc-warning" id=xmw-entity-value-lt><code>xml-misc-warning</code></a>.<!--
343  "strongly advised to avoid" in a Note in Section 2.3 of [XML10], [XML11].  "strongly advised to avoid" in a Note in Section 2.3 of [XML10], [XML11].
344  -->  -->
345  <dt>For each element type declaration processed by the parser  <dt>For each element type declaration being processed by the parser
346    <dd>If there is another element type declaration whose <code>Name</code>    <dd>If there is another processed element type declaration whose
347    is equal to the <code>Name</code> of the element type declaration, then    <code>Name</code> is equal to the <code>Name</code> of the element type
348    the parser <em class=rfc2119>MUST</em> raise an    declaration, then the parser <em class=rfc2119>MUST</em> raise an
349    <a href="#xml-validity-error" id=vc-edunique><code>xml-validity-error</code></a>.    <a href="#xml-validity-error" id=vc-edunique><code>xml-validity-error</code></a>.
350    <dt>For each attribute definition list declaration being processed by the
351    parser
352      <dd>If there is another processed attribute defintion list declaration whose
353      <code>Name</code> is equal to the <code>Name</code> of the attribute
354      definition list declaration, then the parser <em class=rfc2119>MUST</em>
355      raise an
356      <a href="#xml-misc-warning" id=xme-attlist-unique><code>xml-misc-warning</code></a>.
357      <dd>For each attribute definition in the attribute definition list
358      declaration, if there is another processed attribute definition whose
359      <code>Name</code> is equal to the <code>Name</code> of the attribute
360      definition (whether or not in the same attribute definition list
361      declaration), then the parser <em class=rfc2119>MUST</em> raise an
362      <a href="#xml-misc-warning" id=xme-attrdef-unique><code>xml-misc-warning</code></a>.
363      <!--
364        <q>For interoperability, an XML processor <em class=rfc2119>MAY</em> at
365        user option issue a warning when more than one attribute-list declaration
366        is provided for a given element type, or more than one attribute definition
367        is provided for a given attribute, but this is not an error.</q>
368      -->
369  <!--  <!--
370    NOTE: <!ATTLIST a xml:space (default) #IMPLIED xml:space CDATA #IMPLIED>    NOTE: <!ATTLIST a xml:space (default) #IMPLIED xml:space CDATA #IMPLIED>
371    will not be warned.    will not be warned.
372  -->  -->
373    
374    <dt>For each entity declaration being processed by the parser
375      <dd>Handle as follows:
376        <ol>
377        <li><p>If the entity declaration declares a general entity, the following
378        is applied:
379          <dl>
380          <dt>If the <code>Name</code> is <code>lt</code> or <code>amp</code>
381            <dd><p>If the entity declaration does not declare an internal entity,
382            or if the replacement text of the entity is not the escaped form of
383            <code>&lt;</code> (if <code>lt</code>) or <code>&amp;</code> (if
384            <code>amp</code>), then the parser <em class=rfc2119>MUST</em> raise an
385            <a href="#xml-misc-error" id=xme-double-escape><code>xml-misc-error</code></a>.
386    
387              <div class="note memo informative">
388              <p>In other word, the character in the <code>EntityValue</code>
389              has to be double-escaped.
390              </div>
391          <dt>If the <code>Name</code> is <code>gt</code>, <code>quot</code>, or
392          <code>apos</code>
393            <dd><p>If the entity declaration does not declare an internal entity,
394            or if the replacement text of the entity is not equal to or not the
395            escaped form of <code>></code> (if <code>gt</code>), <code>"</code> (if
396            <code>quot</code>), or <code>'</code> (if <code>apos</code>), then the
397            parser <em class=rfc2119>MUST</em> raise an
398            <a href="#xml-misc-error" id=xme-single-escape><code>xml-misc-error</code></a>.
399    
400              <div class="note memo informative">
401              <p>In other word, the character in the <code>EntityValue</code>
402              has to be single- or double-escaped.
403              </div>
404          </dl>
405          <!--
406            <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>
407          -->
408    
409        <li><p>If the entity declaration has to be ignored since there has already
410        been declared an entity with the same <code>Name</code> as the declaration,
411        then the parser <em class=rfc2119>MUST</em> raise a
412        <a href="#misc-info" id=mi-ent-unique><code>misc-info</code></a>
413        and abort these steps.
414    
415        <div class="informative note memo">
416        <p>Five predefined entities, i.e. <code>amp</code>, <code>lt</code>,
417        <code>gt</code>, <code>quot</code>, and <code>apos</code>, are always
418        declared implicitly and therefore any declaration for such an entity
419        always raises an
420        <a href="#misc-info" id=mi-ent-unique><code>misc-info</code></a>.
421        </div>  
422    
423        <li><p>If the entity declaration declares a parameter entity and the
424        <code>Name</code> of the entity begins with the string <code>xml</code>
425        (in any combination of upper- and lowercase letters), then the parser
426        <em class=rfc2119>MUST</em> raise an
427        <a href="#xml-misc-warning" id=xmw-reserved-pe-name><code>xml-misc-warning</code></a>.
428    
429        <li><p>If the entity declaration contains the <code>EntityValue</code>,
430        then for each occurence of any references to unparsed entities in the
431        <code>EntityValue</code>, the parser <em class=rfc2119>MUST</em> raise an
432        <a href="#xml-misc-error" id=xme-unparsed-in-ev><code>xml-misc-error</code></a>.
433        <!--
434          <q>It is an error for a reference to an unparsed entity to appear in the
435          EntityValue in an entity declaration.</q>
436        -->
437        <li><p>If the entity declaration declares a general entity, then an
438        <code>Entity</code> node <em class=rfc2119>MUST</em> be created and
439        appended to the <code>NamedNodeMap</code> object in the
440        <code>entities</code> attribute of the <code>DocumentType</code> node.
441        
442        <p class=ed>Read the external entity
443    
444        <p>If the replacement text of the entity is read, then parse the
445        replacement text as if it were referenced from the content of an
446        element (with no namespace bindings).  If no <span class=ed>@@ parse error</span>
447        is raised by the parsing process, then the nodes generated by the
448        parsing <em class=rfc2119>MUST</em> be appended to the <code>Entity</code>
449        node.  The parse error <em class=rfc2119>MUST NOT</em> be propagated to
450        the entire parsing process.  Other kinds of errors
451        <em class=rfc2119>MUST</em> be propagated.  The first parse error
452        <em class=rfc2119>MUST</em> abort the internal parsing process.
453        <span class=ed>@@ better wording</span>
454    
455        <p class=ed>@@ prop
456        
457        <p>Then, the <code>Entity</code> node and its descendant
458        <em class=rfc2119>MUST</em> be marked as read-only.
459      </ol>
460    
461    <dt>For each notation declaration being processed by the parser
462      <dd>If there is another processed notation declaration whose
463      <code>Name</code> is equal to the <code>Name</code> of the notation
464      declaration, then the parser <em class=rfc2119>MUST</em> raise an
465      <a href="#xml-validity-error" id=vc-uniquenotationname><code>xml-validity-error</code></a>.
466      <!-- <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#UniqueNotationName">Validity constraint: Unique Notation Name</a> -->
467    
468  <dt>For each empty-element tag  <dt>For each empty-element tag
469    <dd>If the <code>Name</code> of the tag is not declared by a processed    <dd>If the <code>Name</code> of the tag is not declared by a processed
470    element type declaration as <code>EMPTY</code> content, then the parser    element type declaration as <code>EMPTY</code> content, then the parser
# Line 257  are applied:</p> Line 475  are applied:</p>
475    type declaration as <code>EMPTY</code> content, then the parser    type declaration as <code>EMPTY</code> content, then the parser
476    <em class=rfc2119>MUST</em> raise an    <em class=rfc2119>MUST</em> raise an
477    <a href="#xml-misc-recommentation" id=xmr-empty-not-emptyelemtag><code>xml-misc-recommendation</code></a>.    <a href="#xml-misc-recommentation" id=xmr-empty-not-emptyelemtag><code>xml-misc-recommendation</code></a>.
478  <!--  <dt>For each attribute
479      <dd><p>The parser <em class=rfc2119>MUST</em> set the normalized value of
480      the attribute to the <code>value</code> attribute of the <code>Attr</code>
481      node created for the attribute.
482    
483        <div class="note memo informative">
484        <p>That is, any entity reference has to be expanded.  Unexpanded entity
485        references in attribute values are discarded.
486        </div>
487    <dt>For each <code>xml:space</code> attribute
488      <dd>The parser <em class=rfc2119>MUST</em> set the normalized value of
489      the <code>xml:space</code> attribute to the <code>value</code> attribute
490      of the <code>Attr</code> node created for the attribute even if the
491      normalized value is different from <code>default</code> or
492      <code>preserve</code>.
493      <!-- In XML 1.0/1.1 specification, the attribute specification MAY be
494      ignored. -->
495    
496    <dt>For each parameter entity reference
497      <dd>If the declaration for the entity is not read (i.e. no declaration
498      for the entity is processed or the external entity referenced by the
499      declaration cannot be retrieved), then:
500        <ul>
501        <li>If the parameter entity is contained in a declaration, then the
502        declaration <em class=rfc2119>MUST</em> be ignored <em>except</em> that
503        any error before the parameter entity <em class=rfc2119>MUST</em> be
504        raised as usual.
505        <li>If the parameter entity is contained in the status portion of a
506        conditional section, then the conditional section
507        <em class=rfc2119>MUST</em> be processed as if it were an
508        <code>IGNORE</code>d section.
509        <li>The parser <em class=rfc2119>MUST NOT</em> process any entity or
510        attribute-list declaration after the parameter entity reference in the DTD
511        <em>except</em> when the <code>standalone</code> pseudo-attribute of the
512        XML declaration (if any) is set to <code>yes</code>.
513        <!-- This requirement is enforced for internal DTD subset case in
514        XML 1.0/1.1 specification (section 5.1) but not for any other cases. -->
515        <!-- According to this definition, element type declarations, notation
516        declarations, and PIs ARE processed. -->
517        <li>If the parameter entity reference is the first reference to an entity
518        that is not read, then the parser <em class=rfc2119>MUST</em> raise an
519        <a href="#entity-error" id=ee-unread-pe><code>entity-error</code></a>.
520        <li>The <code>allDeclarationsProcessed</code> <span class=ed>@@ ref</span>
521        attribute of the <code>Document</code> node <em class=rfc2119>MUST</em> be
522        set to <code>false</code>.
523        </ul>
524    <dt>For each general entity reference in an attribute value or in the content
525    of an element
526      <dd>If the declaration for the entity is not read (i.e. no declaration for
527      the entity is processed or the external entity referenced by the declaration
528      cannot be retrieved), then:
529        <ul>
530        <li>If the general entity reference is the first reference to an entity
531        that is not read, then the parser <em class=rfc2119>MUST</em> raise an
532        <a href="#entity-error" id=ee-unread-ge><code>entity-error</code></a>.
533        <span class=ed>@@ entity declared WFC?</span>
534        <li class=ed>An unexpended entity reference node <em class=rfc2119>MUST</em> be inserted to the current node.
535        </ul>
536    
537    <dt>For each comment <em>outside</em> of document type declaration
538      <dd>A <code>Comment</code> node <em class=rfc2119>MUST</em> be created
539      and inserted appropriately.
540      <!-- In XML 1.0/1.1 spec, this is optional. -->
541    </dl>
542    
543    <p class=ed>@@ MUST try to read external entity
544    
545  #vc-PEinMarkupDecl Validity constraint: Proper Declaration/PE Nesting  <p>In addition, the parser has to check whether the
546  #wfc-PEinInternalSubset Well-formedness constraint: PEs in Internal Subset  following constraints are met.
547  #ExtSubset Well-formedness constraint: External Subset  
548  #PE-between-Decls Well-formedness constraint: PE Between Declarations  <p><strong>Well-formedness constraints</strong>.  For each violation to
549  #GIMatch Well-formedness constraint: Element Type Match  one of constraints below, an
550  #uniqattspec Well-formedness constraint: Unique Att Spec  <a href="#xml-well-formedness-error"><code>xml-well-formedness-error</code></a>
551  #NoExternalRefs Well-formedness constraint: No External Entity References  <em class=rfc2119>MUST</em> be raised.  The list of well-formedness
552  #CleanAttrVals Well-formedness constraint: No < in Attribute Values  constraints is below:
553  #vc-PEinGroup Validity constraint: Proper Group/PE Nesting  <ul>
554  "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 ,)."  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#wfc-PEinInternalSubset">Well-formedness constraint: PEs in Internal Subset</a>
555  "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."  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#GIMatch">Well-formedness constraint: Element Type Match</a>
556  #condsec-nesting Validity constraint: Proper Conditional Section/PE Nesting  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#uniqattspec">Well-formedness constraint: Unique Att Spec</a>
557  #wf-Legalchar Well-formedness constraint: Legal Character  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#NoExternalRefs">Well-formedness constraint: No External Entity References</a>
558  #textent Well-formedness constraint: Parsed Entity  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#CleanAttrVals">Well-formedness constraint: No &lt; in Attribute Values</a>
559  #norecursion Well-formedness constraint: No Recursion  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#wf-Legalchar">Well-formedness constraint: Legal Character</a>
560  #indtd Well-formedness constraint: In DTD  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#textent">Well-formedness constraint: Parsed Entity</a>
561  "External parsed entities SHOULD each begin with a text declaration."  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#norecursion">Well-formedness constraint: No Recursion</a>
562  "It is an error for a reference to an unparsed entity to appear in the EntityValue in an entity declaration."  <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#indtd">Well-formedness constraint: In DTD</a>
563  #UniqueNotationName Validity constraint: Unique Notation Name  </ul>
564    
565    <p><strong>Validity constraints</strong>.  For each violation to
566    one of constraints below, an
567    <a href="#xml-validity-error"><code>xml-validity-error</code></a>.
568    <em class=rfc2119>MUST</em> be raised.  The list of validity
569    constraints is below:
570    <ul>
571    <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#vc-PEinMarkupDecl">Validity constraint: Proper Declaration/PE Nesting</a>
572    <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#vc-PEinGroup">Validity constraint: Proper Group/PE Nesting</a>
573    <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#condsec-nesting">Validity constraint: Proper Conditional Section/PE Nesting</a>
574    </ul>
575    
576    <p><strong>Other creteria</strong>.  For each violation to
577    one of constraints below, an
578    <a href="#xml-misc-recommendation"><code>xml-misc-recommendation</code></a>
579    <em class=rfc2119>MUST</em> be raised.  The list of constraints is below:
580    <ul>
581    <li><q>For interoperability, if a parameter-entity reference appears in a
582    <code>choice</code>, <code>seq</code>, or <code>Mixed</code> construct, its
583    replacement text <em class=rfc2119>SHOULD</em> contain at least one non-blank
584    character, and neither the first nor last non-blank character of the
585    replacement text <em class=rfc2119>SHOULD</em> be a connector (<code>|</code>
586    or <code>,</code>).</q>
587    <li><q>External parsed entities <em class=rfc2119>SHOULD</em> each begin with a
588    text declaration.</q>
589    </ul>
590    
591    
592    <!--
593    
594  @@ Need detailed review, but maybe should be in parsing phase  @@ Need detailed review, but maybe should be in parsing phase
595    
# Line 287  are applied:</p> Line 599  are applied:</p>
599    
600  #wf-entdeclared Well-formedness constraint: Entity Declared  #wf-entdeclared Well-formedness constraint: Entity Declared
601  #vc-entdeclared Validity constraint: Entity Declared  #vc-entdeclared Validity constraint: Entity Declared
 "For interoperability, valid documents SHOULD declare the entities amp, lt, gt, apos, quot, in the form specified in 4.6 Predefined Entities."  
 "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)."  
602    
603  @@ 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  
604    
605  "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."  <p>The parser <em class=rfc2119>MUST</em> act as if it is a
606    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#dt-validating">validating
607    XML processor</a> for the informing of white space appearing in
608    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#dt-elemcontent">element
609    content</a> (See
610    <a href="http://www.w3.org/TR/2006/REC-xml-20060816/#sec-white-space">Section
611    2.10</a> of the XML specification).
612    
613      <div class="note memo informative">
614      <p>In other word, the <code>isElementContentWhitespace</code> attribute
615      of <code>Text</code> nodes has to be set appropriately.  Note that the
616      value of the attribute will be set to <code>false</code> for any
617      <code>Text</code> node in the content of an element whose declaration
618      is not processed.
619      </div>
620    
621    <p>The parser <em class=rfc2119>MUST</em> raise an
622    <a href="#xml-well-formedness-error" id=wfe-syntax><code>xml-well-formedness-error</code></a>
623    for any failure to match to a production rule in the XML specification.
624    <!--
625      <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#ExtSubset">Well-formedness constraint: External Subset</a>
626      <li><a href="http://www.w3.org/TR/2006/REC-xml-20060816/#PE-between-Decls">Well-formedness constraint: PE Between Declarations</a>
627    -->
628    
629    <!--
630      Inpossible to test:
631        "In the absence of external character encoding information (such as MIME
632        headers), parsed entities which are stored in an encoding other than UTF-8
633        or UTF-16 MUST begin with a text declaration"
634  -->  -->
 </dl>  
635  </div>  </div>
636    
637  <div class="section" id=checking-dom>  <div class="section" id=checking-dom>
# Line 383  character that is <em>not</em> in the ch Line 713  character that is <em>not</em> in the ch
713  case combination), then raise an  case combination), then raise an
714  <a href="#xml-misc-warning" id=xmw-reserved-name><code>xml-misc-warning</code></a>.  <a href="#xml-misc-warning" id=xmw-reserved-name><code>xml-misc-warning</code></a>.
715  <span class=ed>@@ except for attribute names <code>xml:lang</code>,  <span class=ed>@@ except for attribute names <code>xml:lang</code>,
716  <code>xml:space</code>, <code>xml:base</code>, <code>xml:id</code>,  <code>xml:space</code><!--, <code>xml:base</code>, <code>xml:id</code>,
717  <code>xmlns</code>, <code>xmlns:<var>*</var></code>,  <code>xmlns</code>, <code>xmlns:<var>*</var></code>,
718  pi name <code>xml-stylesheet</code>.</span><!--  pi name <code>xml-stylesheet</code>-->.</span><!--
719  "names beginning with a match to (('X'|'x')('M'|'m')('L'|'l')) are reserved for standardization in this or future versions of this specification.":  "names beginning with a match to (('X'|'x')('M'|'m')('L'|'l')) are reserved for standardization in this or future versions of this specification.":
720  xmlns, xml-stylesheet, xml:base and xml:id specifications violate to this sentense!  xmlns, xml-stylesheet, xml:base and xml:id specifications violate to this sentense!
721  --></li>  --></li>
# Line 730  following:</p> Line 1060  following:</p>
1060      <a href="#algorithm-to-check-a-node" title="check a node">check the      <a href="#algorithm-to-check-a-node" title="check a node">check the
1061      node</a> recursively.</li>      node</a> recursively.</li>
1062      <li class=ed>@@ externally declared?</li>      <li class=ed>@@ externally declared?</li>
1063        <li>If the <code>NamedNodeMap</code> object in the <code>entities</code>
1064        attribute of <var>n</var> does not contain <code>Entity</code> nodes
1065        whose <code>nodeName</code> attribute are <code>amp</code>,
1066        <code>lt</code>, <code>gt</code>, <code>apos</code>, and <code>quot</code>
1067        then raise
1068        <a href="#xml-misc-recommentation" id=xmr-predefined><code>xml-misc-recommendation</code></a>(s).
1069      </ol>      </ol>
1070    </dd>    </dd>
1071  <dt>If <var>n</var> is an <code>Element</code> node</dt>  <dt>If <var>n</var> is an <code>Element</code> node</dt>
# Line 917  parsed entity)</dt> Line 1253  parsed entity)</dt>
1253      <li>If the <code>childNodes</code> list of <var>n</var> contains      <li>If the <code>childNodes</code> list of <var>n</var> contains
1254      any nodes, then raise an      any nodes, then raise an
1255      <a href="#xml-well-formedness-error" id=wfe-pi-child><code>xml-well-formedness-error</code></a>.</li>      <a href="#xml-well-formedness-error" id=wfe-pi-child><code>xml-well-formedness-error</code></a>.</li>
1256        <li class=ed>@@ Warn if not declared
1257      </ol>      </ol>
1258    </dd>    </dd>
1259  <dt>If <var>n</var> is a <code>Text</code> node</dt>  <dt>If <var>n</var> is a <code>Text</code> node</dt>
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