hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-DTDValidation-IdValidation.html
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<pre><a name="line-1"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='comment'>{- |
<a name="line-4"></a> Module : Text.XML.HXT.DTDValidation.IdValidation
<a name="line-5"></a> Copyright : Copyright (C) 2008 Uwe Schmidt
<a name="line-6"></a> License : MIT
<a name="line-7"></a>
<a name="line-8"></a> Maintainer : Uwe Schmidt (uwe@fh-wedel.de)
<a name="line-9"></a> Stability : experimental
<a name="line-10"></a> Portability: portable
<a name="line-11"></a>
<a name="line-12"></a> This module provides functions for checking special ID/IDREF/IDREFS constraints.
<a name="line-13"></a>
<a name="line-14"></a> Checking special ID\/IDREF\/IDREFS constraints means:
<a name="line-15"></a>
<a name="line-16"></a> - checking that all ID values are unique.
<a name="line-17"></a>
<a name="line-18"></a> - checking that all IDREF\/IDREFS values match the value of some ID attribute
<a name="line-19"></a>
<a name="line-20"></a> ID-Validation should be started before or after validating the document.
<a name="line-21"></a>
<a name="line-22"></a> First all nodes with ID attributes are collected from the document, then
<a name="line-23"></a> it is validated that values of ID attributes do not occure more than once.
<a name="line-24"></a> During a second iteration over the document it is validated that there exists
<a name="line-25"></a> an ID attribute value for IDREF\/IDREFS attribute values.
<a name="line-26"></a>
<a name="line-27"></a>-}</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='keyword'>module</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DTDValidation</span><span class='varop'>.</span><span class='conid'>IdValidation</span>
<a name="line-32"></a> <span class='layout'>(</span> <span class='varid'>validateIds</span>
<a name="line-33"></a> <span class='layout'>)</span>
<a name="line-34"></a><span class='keyword'>where</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>Maybe</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DTDValidation</span><span class='varop'>.</span><span class='conid'>TypeDefs</span>
<a name="line-39"></a><span class='keyword'>import</span> <span class='conid'>Text</span><span class='varop'>.</span><span class='conid'>XML</span><span class='varop'>.</span><span class='conid'>HXT</span><span class='varop'>.</span><span class='conid'>DTDValidation</span><span class='varop'>.</span><span class='conid'>AttributeValueValidation</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='comment'>-- |</span>
<a name="line-44"></a><span class='comment'>-- Lookup-table which maps element names to their validation functions. The</span>
<a name="line-45"></a><span class='comment'>-- validation functions are XmlFilters.</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="IdEnvTable"></a><span class='keyword'>type</span> <span class='conid'>IdEnvTable</span> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span><span class='conid'>IdEnv</span><span class='keyglyph'>]</span>
<a name="line-48"></a><a name="IdEnv"></a><span class='keyword'>type</span> <span class='conid'>IdEnv</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='conid'>ElemName</span><span class='layout'>,</span> <span class='conid'>IdFct</span><span class='layout'>)</span>
<a name="line-49"></a><a name="ElemName"></a><span class='keyword'>type</span> <span class='conid'>ElemName</span> <span class='keyglyph'>=</span> <span class='conid'>String</span>
<a name="line-50"></a><a name="IdFct"></a><span class='keyword'>type</span> <span class='conid'>IdFct</span> <span class='keyglyph'>=</span> <span class='conid'>XmlArrow</span>
<a name="line-51"></a>
<a name="line-52"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-53"></a>
<a name="line-54"></a><span class='comment'>-- |</span>
<a name="line-55"></a><span class='comment'>-- Perform the validation of the ID/IDREF/IDREFS constraints.</span>
<a name="line-56"></a><span class='comment'>--</span>
<a name="line-57"></a><span class='comment'>-- * 1.parameter dtdPart : the DTD subset (Node @DOCTYPE@) of the XmlTree</span>
<a name="line-58"></a><span class='comment'>--</span>
<a name="line-59"></a><span class='comment'>-- - 2.parameter doc : the document subset of the XmlTree</span>
<a name="line-60"></a><span class='comment'>--</span>
<a name="line-61"></a><span class='comment'>-- - returns : a list of errors</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="validateIds"></a><span class='definition'>validateIds</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-64"></a><span class='definition'>validateIds</span> <span class='varid'>dtdPart</span>
<a name="line-65"></a> <span class='keyglyph'>=</span> <span class='varid'>validateIds'</span> <span class='varop'>$<</span> <span class='varid'>listA</span> <span class='layout'>(</span><span class='varid'>traverseTree</span> <span class='varid'>idEnv</span><span class='layout'>)</span>
<a name="line-66"></a> <span class='keyword'>where</span>
<a name="line-67"></a> <span class='varid'>idAttrTypes</span> <span class='keyglyph'>=</span> <span class='varid'>runLA</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isIdAttrType</span><span class='layout'>)</span> <span class='varid'>dtdPart</span>
<a name="line-68"></a> <span class='varid'>elements</span> <span class='keyglyph'>=</span> <span class='varid'>runLA</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isDTDElement</span><span class='layout'>)</span> <span class='varid'>dtdPart</span>
<a name="line-69"></a> <span class='varid'>atts</span> <span class='keyglyph'>=</span> <span class='varid'>runLA</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isDTDAttlist</span><span class='layout'>)</span> <span class='varid'>dtdPart</span>
<a name="line-70"></a> <span class='varid'>idEnv</span> <span class='keyglyph'>=</span> <span class='varid'>buildIdCollectorFcts</span> <span class='varid'>idAttrTypes</span>
<a name="line-71"></a>
<a name="line-72"></a> <span class='varid'>validateIds'</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-73"></a> <span class='varid'>validateIds'</span> <span class='varid'>idNodeList</span>
<a name="line-74"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='varid'>constA</span> <span class='varid'>idNodeList</span> <span class='varop'>>>></span> <span class='varid'>checkForUniqueIds</span> <span class='varid'>idAttrTypes</span> <span class='layout'>)</span>
<a name="line-75"></a> <span class='varop'><+></span>
<a name="line-76"></a> <span class='varid'>checkIdReferences</span> <span class='varid'>idRefEnv</span>
<a name="line-77"></a> <span class='keyword'>where</span>
<a name="line-78"></a> <span class='varid'>idRefEnv</span> <span class='keyglyph'>=</span> <span class='varid'>buildIdrefValidationFcts</span> <span class='varid'>idAttrTypes</span> <span class='varid'>elements</span> <span class='varid'>atts</span> <span class='varid'>idNodeList</span>
<a name="line-79"></a>
<a name="line-80"></a>
<a name="line-81"></a>
<a name="line-82"></a><span class='comment'>-- |</span>
<a name="line-83"></a><span class='comment'>-- Traverse the XmlTree in preorder.</span>
<a name="line-84"></a><span class='comment'>--</span>
<a name="line-85"></a><span class='comment'>-- * 1.parameter idEnv : lookup-table which maps element names to their validation functions</span>
<a name="line-86"></a><span class='comment'>--</span>
<a name="line-87"></a><span class='comment'>-- - returns : list of errors</span>
<a name="line-88"></a>
<a name="line-89"></a><a name="traverseTree"></a><span class='definition'>traverseTree</span> <span class='keyglyph'>::</span> <span class='conid'>IdEnvTable</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-90"></a><span class='definition'>traverseTree</span> <span class='varid'>idEnv</span>
<a name="line-91"></a> <span class='keyglyph'>=</span> <span class='varid'>multi</span> <span class='layout'>(</span><span class='varid'>isElem</span> <span class='varop'>`guards`</span> <span class='layout'>(</span><span class='varid'>idFct</span> <span class='varop'>$<</span> <span class='varid'>getName</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-92"></a> <span class='keyword'>where</span>
<a name="line-93"></a> <span class='varid'>idFct</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-94"></a> <span class='varid'>idFct</span> <span class='varid'>name</span> <span class='keyglyph'>=</span> <span class='varid'>fromMaybe</span> <span class='varid'>none</span> <span class='varop'>.</span> <span class='varid'>lookup</span> <span class='varid'>name</span> <span class='varop'>$</span> <span class='varid'>idEnv</span>
<a name="line-95"></a>
<a name="line-96"></a><span class='comment'>-- |</span>
<a name="line-97"></a><span class='comment'>-- Returns the value of an element's ID attribute. The attribute name has to be</span>
<a name="line-98"></a><span class='comment'>-- retrieved first from the DTD.</span>
<a name="line-99"></a><span class='comment'>--</span>
<a name="line-100"></a><span class='comment'>-- * 1.parameter dtdPart : list of ID attribute definitions from the DTD</span>
<a name="line-101"></a><span class='comment'>--</span>
<a name="line-102"></a><span class='comment'>-- - 2.parameter n : element which ID attribute value should be returned</span>
<a name="line-103"></a><span class='comment'>--</span>
<a name="line-104"></a><span class='comment'>-- - returns : normalized value of the ID attribute</span>
<a name="line-105"></a>
<a name="line-106"></a><a name="getIdValue"></a><span class='definition'>getIdValue</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>String</span>
<a name="line-107"></a><span class='definition'>getIdValue</span> <span class='varid'>dns</span>
<a name="line-108"></a> <span class='keyglyph'>=</span> <span class='varid'>concat</span> <span class='varop'>.</span> <span class='varid'>runLA</span> <span class='layout'>(</span><span class='varid'>single</span> <span class='varid'>getIdValue'</span><span class='layout'>)</span>
<a name="line-109"></a> <span class='keyword'>where</span>
<a name="line-110"></a> <span class='varid'>getIdValue'</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-111"></a> <span class='varid'>getIdValue'</span>
<a name="line-112"></a> <span class='keyglyph'>=</span> <span class='varid'>isElem</span> <span class='varop'>`guards`</span> <span class='varid'>catA</span> <span class='layout'>(</span><span class='varid'>map</span> <span class='varid'>getIdVal</span> <span class='varid'>dns</span><span class='layout'>)</span>
<a name="line-113"></a> <span class='keyword'>where</span>
<a name="line-114"></a> <span class='varid'>getIdVal</span> <span class='varid'>dn</span>
<a name="line-115"></a> <span class='keyglyph'>|</span> <span class='varid'>isDTDAttlistNode</span> <span class='varid'>dn</span> <span class='keyglyph'>=</span> <span class='varid'>hasName</span> <span class='varid'>elemName</span>
<a name="line-116"></a> <span class='varop'>`guards`</span>
<a name="line-117"></a> <span class='layout'>(</span> <span class='varid'>getAttrValue0</span> <span class='varid'>attrName</span>
<a name="line-118"></a> <span class='varop'>>>></span>
<a name="line-119"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='varid'>normalizeAttributeValue</span> <span class='layout'>(</span><span class='conid'>Just</span> <span class='varid'>dn</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-120"></a> <span class='layout'>)</span>
<a name="line-121"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='varid'>none</span>
<a name="line-122"></a> <span class='keyword'>where</span>
<a name="line-123"></a> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>getDTDAttributes</span> <span class='varid'>dn</span>
<a name="line-124"></a> <span class='varid'>elemName</span> <span class='keyglyph'>=</span> <span class='varid'>dtd_name</span> <span class='varid'>al</span>
<a name="line-125"></a> <span class='varid'>attrName</span> <span class='keyglyph'>=</span> <span class='varid'>dtd_value</span> <span class='varid'>al</span>
<a name="line-126"></a>
<a name="line-127"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-128"></a>
<a name="line-129"></a>
<a name="line-130"></a><span class='comment'>-- |</span>
<a name="line-131"></a><span class='comment'>-- Build collector functions which return XTag nodes with ID attributes from</span>
<a name="line-132"></a><span class='comment'>-- a document.</span>
<a name="line-133"></a><span class='comment'>--</span>
<a name="line-134"></a><span class='comment'>-- * 1.parameter dtdPart : the children of the @DOCTYPE@ node</span>
<a name="line-135"></a><span class='comment'>--</span>
<a name="line-136"></a><span class='comment'>-- - returns : lookup-table which maps element names to their collector function</span>
<a name="line-137"></a>
<a name="line-138"></a><a name="buildIdCollectorFcts"></a><span class='definition'>buildIdCollectorFcts</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>IdEnvTable</span>
<a name="line-139"></a><span class='definition'>buildIdCollectorFcts</span> <span class='varid'>idAttrTypes</span>
<a name="line-140"></a> <span class='keyglyph'>=</span> <span class='varid'>concatMap</span> <span class='varid'>buildIdCollectorFct</span> <span class='varid'>idAttrTypes</span>
<a name="line-141"></a> <span class='keyword'>where</span>
<a name="line-142"></a> <span class='varid'>buildIdCollectorFct</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>IdEnv</span><span class='keyglyph'>]</span>
<a name="line-143"></a> <span class='varid'>buildIdCollectorFct</span> <span class='varid'>dn</span>
<a name="line-144"></a> <span class='keyglyph'>|</span> <span class='varid'>isDTDAttlistNode</span> <span class='varid'>dn</span> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='varid'>elemName</span><span class='layout'>,</span> <span class='varid'>hasAttr</span> <span class='varid'>attrName</span><span class='layout'>)</span><span class='keyglyph'>]</span>
<a name="line-145"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='conid'>[]</span>
<a name="line-146"></a> <span class='keyword'>where</span>
<a name="line-147"></a> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>getDTDAttributes</span> <span class='varid'>dn</span>
<a name="line-148"></a> <span class='varid'>elemName</span> <span class='keyglyph'>=</span> <span class='varid'>dtd_name</span> <span class='varid'>al</span>
<a name="line-149"></a> <span class='varid'>attrName</span> <span class='keyglyph'>=</span> <span class='varid'>dtd_value</span> <span class='varid'>al</span>
<a name="line-150"></a>
<a name="line-151"></a><span class='comment'>-- |</span>
<a name="line-152"></a><span class='comment'>-- Build validation functions for checking if IDREF\/IDREFS values match a value</span>
<a name="line-153"></a><span class='comment'>-- of some ID attributes.</span>
<a name="line-154"></a><span class='comment'>--</span>
<a name="line-155"></a><span class='comment'>-- * 1.parameter dtdPart : the children of the @DOCTYPE@ node</span>
<a name="line-156"></a><span class='comment'>--</span>
<a name="line-157"></a><span class='comment'>-- - 2.parameter idNodeList : list of all XTag nodes with ID attributes</span>
<a name="line-158"></a><span class='comment'>--</span>
<a name="line-159"></a><span class='comment'>-- - returns : lookup-table which maps element names to their validation function</span>
<a name="line-160"></a>
<a name="line-161"></a><a name="buildIdrefValidationFcts"></a><span class='definition'>buildIdrefValidationFcts</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>IdEnvTable</span>
<a name="line-162"></a><span class='definition'>buildIdrefValidationFcts</span> <span class='varid'>idAttrTypes</span> <span class='varid'>elements</span> <span class='varid'>atts</span> <span class='varid'>idNodeList</span>
<a name="line-163"></a> <span class='keyglyph'>=</span> <span class='varid'>concatMap</span> <span class='varid'>buildElemValidationFct</span> <span class='varid'>elements</span>
<a name="line-164"></a> <span class='keyword'>where</span>
<a name="line-165"></a> <span class='varid'>idValueList</span> <span class='keyglyph'>=</span> <span class='varid'>map</span> <span class='layout'>(</span><span class='varid'>getIdValue</span> <span class='varid'>idAttrTypes</span><span class='layout'>)</span> <span class='varid'>idNodeList</span>
<a name="line-166"></a>
<a name="line-167"></a> <span class='varid'>buildElemValidationFct</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='conid'>IdEnv</span><span class='keyglyph'>]</span>
<a name="line-168"></a> <span class='varid'>buildElemValidationFct</span> <span class='varid'>dn</span>
<a name="line-169"></a> <span class='keyglyph'>|</span> <span class='varid'>isDTDElementNode</span> <span class='varid'>dn</span> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='varid'>elemName</span><span class='layout'>,</span> <span class='varid'>buildIdrefValidationFct</span> <span class='varid'>idRefAttrTypes</span><span class='layout'>)</span><span class='keyglyph'>]</span>
<a name="line-170"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='conid'>[]</span>
<a name="line-171"></a> <span class='keyword'>where</span>
<a name="line-172"></a> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>getDTDAttributes</span> <span class='varid'>dn</span>
<a name="line-173"></a> <span class='varid'>elemName</span> <span class='keyglyph'>=</span> <span class='varid'>dtd_name</span> <span class='varid'>al</span>
<a name="line-174"></a> <span class='varid'>idRefAttrTypes</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>isAttlistOfElement</span> <span class='varid'>elemName</span> <span class='varop'>>>></span> <span class='varid'>isIdRefAttrType</span><span class='layout'>)</span> <span class='varop'>$$</span> <span class='varid'>atts</span>
<a name="line-175"></a>
<a name="line-176"></a> <span class='varid'>buildIdrefValidationFct</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-177"></a> <span class='varid'>buildIdrefValidationFct</span>
<a name="line-178"></a> <span class='keyglyph'>=</span> <span class='varid'>catA</span> <span class='varop'>.</span> <span class='varid'>map</span> <span class='varid'>buildIdref</span>
<a name="line-179"></a>
<a name="line-180"></a> <span class='varid'>buildIdref</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-181"></a> <span class='varid'>buildIdref</span> <span class='varid'>dn</span>
<a name="line-182"></a> <span class='keyglyph'>|</span> <span class='varid'>isDTDAttlistNode</span> <span class='varid'>dn</span> <span class='keyglyph'>=</span> <span class='varid'>isElem</span> <span class='varop'>>>></span> <span class='layout'>(</span><span class='varid'>checkIdref</span> <span class='varop'>$<</span> <span class='varid'>getName</span><span class='layout'>)</span>
<a name="line-183"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span> <span class='keyglyph'>=</span> <span class='varid'>none</span>
<a name="line-184"></a> <span class='keyword'>where</span>
<a name="line-185"></a> <span class='varid'>al</span> <span class='keyglyph'>=</span> <span class='varid'>getDTDAttributes</span> <span class='varid'>dn</span>
<a name="line-186"></a> <span class='varid'>attrName</span> <span class='keyglyph'>=</span> <span class='varid'>dtd_value</span> <span class='varid'>al</span>
<a name="line-187"></a> <span class='varid'>attrType</span> <span class='keyglyph'>=</span> <span class='varid'>dtd_type</span> <span class='varid'>al</span>
<a name="line-188"></a>
<a name="line-189"></a> <span class='varid'>checkIdref</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-190"></a> <span class='varid'>checkIdref</span> <span class='varid'>name</span>
<a name="line-191"></a> <span class='keyglyph'>=</span> <span class='varid'>hasAttr</span> <span class='varid'>attrName</span>
<a name="line-192"></a> <span class='varop'>`guards`</span>
<a name="line-193"></a> <span class='layout'>(</span> <span class='varid'>checkIdVal</span> <span class='varop'>$<</span> <span class='varid'>getAttrValue</span> <span class='varid'>attrName</span> <span class='layout'>)</span>
<a name="line-194"></a> <span class='keyword'>where</span>
<a name="line-195"></a> <span class='varid'>checkIdVal</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-196"></a> <span class='varid'>checkIdVal</span> <span class='varid'>av</span>
<a name="line-197"></a> <span class='keyglyph'>|</span> <span class='varid'>attrType</span> <span class='varop'>==</span> <span class='varid'>k_idref</span>
<a name="line-198"></a> <span class='keyglyph'>=</span> <span class='varid'>checkValueDeclared</span> <span class='varid'>attrValue</span>
<a name="line-199"></a> <span class='keyglyph'>|</span> <span class='varid'>null</span> <span class='varid'>valueList</span>
<a name="line-200"></a> <span class='keyglyph'>=</span> <span class='varid'>err</span> <span class='layout'>(</span> <span class='str'>"Attribute "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>attrName</span> <span class='varop'>++</span>
<a name="line-201"></a> <span class='str'>" of Element "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>name</span> <span class='varop'>++</span>
<a name="line-202"></a> <span class='str'>" must have at least one name."</span>
<a name="line-203"></a> <span class='layout'>)</span>
<a name="line-204"></a> <span class='keyglyph'>|</span> <span class='varid'>otherwise</span>
<a name="line-205"></a> <span class='keyglyph'>=</span> <span class='varid'>catA</span> <span class='varop'>.</span> <span class='varid'>map</span> <span class='varid'>checkValueDeclared</span> <span class='varop'>$</span> <span class='varid'>valueList</span>
<a name="line-206"></a> <span class='keyword'>where</span>
<a name="line-207"></a> <span class='varid'>valueList</span> <span class='keyglyph'>=</span> <span class='varid'>words</span> <span class='varid'>attrValue</span>
<a name="line-208"></a> <span class='varid'>attrValue</span> <span class='keyglyph'>=</span> <span class='varid'>normalizeAttributeValue</span> <span class='layout'>(</span><span class='conid'>Just</span> <span class='varid'>dn</span><span class='layout'>)</span> <span class='varid'>av</span>
<a name="line-209"></a>
<a name="line-210"></a> <span class='varid'>checkValueDeclared</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlArrow</span>
<a name="line-211"></a> <span class='varid'>checkValueDeclared</span> <span class='varid'>attrValue</span>
<a name="line-212"></a> <span class='keyglyph'>=</span> <span class='keyword'>if</span> <span class='varid'>attrValue</span> <span class='varop'>`elem`</span> <span class='varid'>idValueList</span>
<a name="line-213"></a> <span class='keyword'>then</span> <span class='varid'>none</span>
<a name="line-214"></a> <span class='keyword'>else</span> <span class='varid'>err</span> <span class='layout'>(</span> <span class='str'>"An Element with identifier "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>attrValue</span> <span class='varop'>++</span>
<a name="line-215"></a> <span class='str'>" must appear in the document."</span>
<a name="line-216"></a> <span class='layout'>)</span>
<a name="line-217"></a>
<a name="line-218"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-219"></a>
<a name="line-220"></a>
<a name="line-221"></a><span class='comment'>-- |</span>
<a name="line-222"></a><span class='comment'>-- Validate that all ID values are unique within a document.</span>
<a name="line-223"></a><span class='comment'>-- Validity constraint: ID (3.3.1 \/p. 25 in Spec)</span>
<a name="line-224"></a><span class='comment'>--</span>
<a name="line-225"></a><span class='comment'>-- * 1.parameter idNodeList : list of all XTag nodes with ID attributes</span>
<a name="line-226"></a><span class='comment'>--</span>
<a name="line-227"></a><span class='comment'>-- - 2.parameter dtdPart : the children of the @DOCTYPE@ node</span>
<a name="line-228"></a><span class='comment'>--</span>
<a name="line-229"></a><span class='comment'>-- - returns : a list of errors</span>
<a name="line-230"></a>
<a name="line-231"></a><a name="checkForUniqueIds"></a><span class='definition'>checkForUniqueIds</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTrees</span> <span class='conid'>XmlTree</span>
<a name="line-232"></a><span class='definition'>checkForUniqueIds</span> <span class='varid'>idAttrTypes</span> <span class='comment'>-- idNodeList</span>
<a name="line-233"></a> <span class='keyglyph'>=</span> <span class='varid'>fromSLA</span> <span class='conid'>[]</span> <span class='layout'>(</span> <span class='varid'>unlistA</span>
<a name="line-234"></a> <span class='varop'>>>></span>
<a name="line-235"></a> <span class='varid'>isElem</span>
<a name="line-236"></a> <span class='varop'>>>></span>
<a name="line-237"></a> <span class='layout'>(</span><span class='varid'>checkForUniqueId</span> <span class='varop'>$<<</span> <span class='varid'>getName</span> <span class='varop'>&&&</span> <span class='varid'>this</span><span class='layout'>)</span>
<a name="line-238"></a> <span class='layout'>)</span>
<a name="line-239"></a> <span class='keyword'>where</span>
<a name="line-240"></a> <span class='varid'>checkForUniqueId</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>SLA</span> <span class='keyglyph'>[</span><span class='conid'>String</span><span class='keyglyph'>]</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-241"></a> <span class='varid'>checkForUniqueId</span> <span class='varid'>name</span> <span class='varid'>x</span>
<a name="line-242"></a> <span class='keyglyph'>=</span> <span class='varid'>ifA</span> <span class='layout'>(</span> <span class='varid'>getState</span>
<a name="line-243"></a> <span class='varop'>>>></span>
<a name="line-244"></a> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>attrValue</span> <span class='varop'>`elem`</span><span class='layout'>)</span>
<a name="line-245"></a> <span class='layout'>)</span>
<a name="line-246"></a> <span class='layout'>(</span><span class='varid'>err</span> <span class='layout'>(</span> <span class='str'>"Attribute value "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>attrValue</span> <span class='varop'>++</span> <span class='str'>" of type ID for element "</span> <span class='varop'>++</span>
<a name="line-247"></a> <span class='varid'>show</span> <span class='varid'>name</span> <span class='varop'>++</span> <span class='str'>" must be unique within the document."</span> <span class='layout'>)</span><span class='layout'>)</span>
<a name="line-248"></a> <span class='layout'>(</span><span class='varid'>nextState</span> <span class='layout'>(</span><span class='varid'>attrValue</span><span class='conop'>:</span><span class='layout'>)</span> <span class='varop'>>>></span> <span class='varid'>none</span><span class='layout'>)</span>
<a name="line-249"></a> <span class='keyword'>where</span>
<a name="line-250"></a> <span class='varid'>attrValue</span> <span class='keyglyph'>=</span> <span class='varid'>getIdValue</span> <span class='layout'>(</span><span class='varid'>isAttlistOfElement</span> <span class='varid'>name</span> <span class='varop'>$$</span> <span class='varid'>idAttrTypes</span><span class='layout'>)</span> <span class='varid'>x</span>
<a name="line-251"></a>
<a name="line-252"></a><span class='comment'>-- |</span>
<a name="line-253"></a><span class='comment'>-- Validate that all IDREF\/IDREFS values match the value of some ID attribute.</span>
<a name="line-254"></a><span class='comment'>-- Validity constraint: IDREF (3.3.1 \/ p.26 in Spec)</span>
<a name="line-255"></a><span class='comment'>--</span>
<a name="line-256"></a><span class='comment'>-- * 1.parameter idRefEnv : lookup-table which maps element names to their validation function</span>
<a name="line-257"></a><span class='comment'>--</span>
<a name="line-258"></a><span class='comment'>-- - 2.parameter doc : the document to validate</span>
<a name="line-259"></a><span class='comment'>--</span>
<a name="line-260"></a><span class='comment'>-- - returns : a list of errors</span>
<a name="line-261"></a>
<a name="line-262"></a><a name="checkIdReferences"></a><span class='definition'>checkIdReferences</span> <span class='keyglyph'>::</span> <span class='conid'>IdEnvTable</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>XmlTree</span>
<a name="line-263"></a><span class='definition'>checkIdReferences</span> <span class='varid'>idRefEnv</span>
<a name="line-264"></a> <span class='keyglyph'>=</span> <span class='varid'>traverseTree</span> <span class='varid'>idRefEnv</span>
<a name="line-265"></a>
<a name="line-266"></a><span class='comment'>-- ------------------------------------------------------------</span>
</pre></body>
</html>