hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-Validator-DocTransformation.html
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<pre><a name="line-1"></a><span class='comment'>-- |</span>
<a name="line-2"></a><span class='comment'>-- This module provides functions for transforming XML documents represented as</span>
<a name="line-3"></a><span class='comment'>-- XmlTree with respect to its DTD.</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='comment'>-- Transforming an XML document with respect to its DTD means:</span>
<a name="line-6"></a><span class='comment'>--</span>
<a name="line-7"></a><span class='comment'>-- - add all attributes with default values</span>
<a name="line-8"></a><span class='comment'>--</span>
<a name="line-9"></a><span class='comment'>-- - normalize all attribute values</span>
<a name="line-10"></a><span class='comment'>--</span>
<a name="line-11"></a><span class='comment'>-- - sort all attributes in lexical order</span>
<a name="line-12"></a><span class='comment'>--</span>
<a name="line-13"></a>
<a name="line-14"></a>
<a name="line-15"></a><span class='comment'>-- Note: Transformation should be started after validation.</span>
<a name="line-16"></a>
<a name="line-17"></a>
<a name="line-18"></a><span class='comment'>-- Before the document is validated, a lookup-table is build on the basis of</span>
<a name="line-19"></a><span class='comment'>-- the DTD which maps element names to their transformation functions.</span>
<a name="line-20"></a><span class='comment'>-- After this initialization phase the whole document is traversed in preorder</span>
<a name="line-21"></a><span class='comment'>-- and every element is transformed by the XmlFilter from the lookup-table.</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='comment'>-- Special namings in source code:</span>
<a name="line-24"></a><span class='comment'>--</span>
<a name="line-25"></a><span class='comment'>-- - nd - XDTD node</span>
<a name="line-26"></a><span class='comment'>--</span>
<a name="line-27"></a><span class='comment'>-- - n - XTag node</span>
<a name="line-28"></a><span class='comment'>--</span>
<a name="line-29"></a><span class='comment'>-- Author : .\\artin Schmidt</span>
<a name="line-30"></a><span class='comment'>-- Version : $Id: DocTransformation.hs,v 1.1 2004/09/02 19:12:03 hxml Exp $</span>
<a name="line-31"></a>
<a name="line-32"></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'>Validator</span><span class='varop'>.</span><span class='conid'>DocTransformation</span>
<a name="line-33"></a> <span class='layout'>(</span> <span class='varid'>transform</span>
<a name="line-34"></a> <span class='layout'>)</span>
<a name="line-35"></a><span class='keyword'>where</span>
<a name="line-36"></a>
<a name="line-37"></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'>DOM</span><span class='varop'>.</span><span class='conid'>XmlTree</span>
<a name="line-38"></a>
<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'>Validator</span><span class='varop'>.</span><span class='conid'>AttributeValueValidation</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>Maybe</span>
<a name="line-42"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>List</span>
<a name="line-43"></a>
<a name="line-44"></a>
<a name="line-45"></a>
<a name="line-46"></a><span class='comment'>-- |</span>
<a name="line-47"></a><span class='comment'>-- Lookup-table which maps element names to their transformation functions. The</span>
<a name="line-48"></a><span class='comment'>-- transformation functions are XmlFilters.</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="TransEnvTable"></a><span class='keyword'>type</span> <span class='conid'>TransEnvTable</span> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span><span class='conid'>TransEnv</span><span class='keyglyph'>]</span>
<a name="line-51"></a><a name="TransEnv"></a><span class='keyword'>type</span> <span class='conid'>TransEnv</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='conid'>ElemName</span><span class='layout'>,</span> <span class='conid'>TransFct</span><span class='layout'>)</span>
<a name="line-52"></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-53"></a><a name="TransFct"></a><span class='keyword'>type</span> <span class='conid'>TransFct</span> <span class='keyglyph'>=</span> <span class='conid'>XmlFilter</span>
<a name="line-54"></a>
<a name="line-55"></a>
<a name="line-56"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-57"></a>
<a name="line-58"></a>
<a name="line-59"></a><span class='comment'>-- |</span>
<a name="line-60"></a><span class='comment'>-- filter for transforming the document.</span>
<a name="line-61"></a><span class='comment'>--</span>
<a name="line-62"></a><span class='comment'>-- * 1.parameter dtdPart : the DTD subset (Node @DOCTYPE@) of the XmlTree</span>
<a name="line-63"></a><span class='comment'>--</span>
<a name="line-64"></a><span class='comment'>-- - 2.parameter doc : the document subset of the XmlTree</span>
<a name="line-65"></a><span class='comment'>--</span>
<a name="line-66"></a><span class='comment'>-- - returns : a list of errors</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="transform"></a><span class='definition'>transform</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span>
<a name="line-69"></a><span class='definition'>transform</span> <span class='varid'>dtdPart</span> <span class='varid'>dom</span>
<a name="line-70"></a> <span class='keyglyph'>=</span> <span class='varid'>traverseTree</span> <span class='varid'>transTable</span> <span class='varid'>dom</span>
<a name="line-71"></a> <span class='keyword'>where</span>
<a name="line-72"></a> <span class='varid'>transTable</span> <span class='keyglyph'>=</span> <span class='comment'>{-# SCC "buildAllTransFcts" #-}</span> <span class='varid'>buildAllTransformationFunctions</span> <span class='varid'>dtdPart</span>
<a name="line-73"></a>
<a name="line-74"></a>
<a name="line-75"></a>
<a name="line-76"></a><span class='comment'>-- |</span>
<a name="line-77"></a><span class='comment'>-- Traverse the XmlTree in preorder.</span>
<a name="line-78"></a><span class='comment'>--</span>
<a name="line-79"></a><span class='comment'>-- * 1.parameter transEnv : lookup-table which maps element names to their transformation functions</span>
<a name="line-80"></a><span class='comment'>--</span>
<a name="line-81"></a><span class='comment'>-- - returns : the whole transformed document</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="traverseTree"></a><span class='definition'>traverseTree</span> <span class='keyglyph'>::</span> <span class='conid'>TransEnvTable</span> <span class='keyglyph'>-></span> <span class='conid'>XmlFilter</span>
<a name="line-84"></a><span class='definition'>traverseTree</span> <span class='varid'>transEnv</span> <span class='varid'>n</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XTag</span> <span class='varid'>name</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='varid'>cs</span><span class='layout'>)</span>
<a name="line-85"></a> <span class='keyglyph'>=</span> <span class='varid'>replaceChildren</span> <span class='layout'>(</span><span class='varid'>concatMap</span> <span class='layout'>(</span><span class='varid'>traverseTree</span> <span class='varid'>transEnv</span><span class='layout'>)</span> <span class='varid'>cs</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>head</span> <span class='layout'>(</span><span class='varid'>transFct</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-86"></a> <span class='keyword'>where</span>
<a name="line-87"></a> <span class='varid'>transFct</span> <span class='keyglyph'>=</span> <span class='keyword'>case</span> <span class='layout'>(</span><span class='varid'>lookup</span> <span class='layout'>(</span><span class='varid'>qualifiedName</span> <span class='varid'>name</span><span class='layout'>)</span> <span class='varid'>transEnv</span><span class='layout'>)</span> <span class='keyword'>of</span>
<a name="line-88"></a> <span class='conid'>Nothing</span> <span class='keyglyph'>-></span> <span class='varid'>this</span> <span class='comment'>-- element not in DTD, can't be transformed</span>
<a name="line-89"></a> <span class='conid'>Just</span> <span class='varid'>f</span> <span class='keyglyph'>-></span> <span class='varid'>f</span>
<a name="line-90"></a>
<a name="line-91"></a><span class='definition'>traverseTree</span> <span class='keyword'>_</span> <span class='varid'>n</span> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span><span class='varid'>n</span><span class='keyglyph'>]</span>
<a name="line-92"></a>
<a name="line-93"></a>
<a name="line-94"></a><span class='comment'>-- |</span>
<a name="line-95"></a><span class='comment'>-- Build all transformation functions.</span>
<a name="line-96"></a><span class='comment'>--</span>
<a name="line-97"></a><span class='comment'>-- * 1.parameter dtdPart : the DTD subset, root node should be of type @DOCTYPE@</span>
<a name="line-98"></a><span class='comment'>--</span>
<a name="line-99"></a><span class='comment'>-- - returns : lookup-table which maps element names to their transformation functions</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="buildAllTransformationFunctions"></a><span class='definition'>buildAllTransformationFunctions</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>TransEnvTable</span>
<a name="line-102"></a><span class='definition'>buildAllTransformationFunctions</span> <span class='varid'>dtdPart</span>
<a name="line-103"></a> <span class='keyglyph'>=</span> <span class='varid'>buildTransRoot</span>
<a name="line-104"></a> <span class='conop'>:</span>
<a name="line-105"></a> <span class='comment'>-- construct the list of filters</span>
<a name="line-106"></a> <span class='varid'>map</span> <span class='layout'>(</span><span class='varid'>buildTransformationFunctions</span> <span class='varid'>dtdNodes</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>isElement</span> <span class='varop'>$$</span> <span class='varid'>dtdNodes</span><span class='layout'>)</span>
<a name="line-107"></a> <span class='keyword'>where</span>
<a name="line-108"></a> <span class='varid'>dtdNodes</span> <span class='keyglyph'>=</span> <span class='varid'>getChildren</span> <span class='varid'>dtdPart</span>
<a name="line-109"></a>
<a name="line-110"></a>
<a name="line-111"></a><span class='comment'>-- |</span>
<a name="line-112"></a><span class='comment'>-- Build a transformation function for the document root. By root @\/@</span>
<a name="line-113"></a><span class='comment'>-- is meant, which is the topmost dummy created by the parser. This function is only a</span>
<a name="line-114"></a><span class='comment'>-- dummy, too.</span>
<a name="line-115"></a><span class='comment'>--</span>
<a name="line-116"></a><span class='comment'>-- * returns : entry for the lookup-table</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="buildTransRoot"></a><span class='definition'>buildTransRoot</span> <span class='keyglyph'>::</span> <span class='conid'>TransEnv</span>
<a name="line-119"></a><span class='definition'>buildTransRoot</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>t_root</span><span class='layout'>,</span> <span class='varid'>this</span><span class='layout'>)</span>
<a name="line-120"></a>
<a name="line-121"></a>
<a name="line-122"></a>
<a name="line-123"></a><span class='comment'>-- |</span>
<a name="line-124"></a><span class='comment'>-- Build transformation functions for an element.</span>
<a name="line-125"></a><span class='comment'>--</span>
<a name="line-126"></a><span class='comment'>-- * 1.parameter dtdPart : the children of the @DOCTYPE@ node</span>
<a name="line-127"></a><span class='comment'>--</span>
<a name="line-128"></a><span class='comment'>-- * 1.parameter nd : element declaration for which the transformation functions are</span>
<a name="line-129"></a><span class='comment'>-- created</span>
<a name="line-130"></a><span class='comment'>--</span>
<a name="line-131"></a><span class='comment'>-- - returns : entry for the lookup-table</span>
<a name="line-132"></a>
<a name="line-133"></a><a name="buildTransformationFunctions"></a><span class='definition'>buildTransformationFunctions</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'>TransEnv</span>
<a name="line-134"></a>
<a name="line-135"></a><span class='definition'>buildTransformationFunctions</span> <span class='varid'>dtdPart</span> <span class='varid'>n</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XDTD</span> <span class='conid'>ELEMENT</span> <span class='varid'>al</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span>
<a name="line-136"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>name</span><span class='layout'>,</span> <span class='varid'>transFct</span><span class='layout'>)</span>
<a name="line-137"></a> <span class='keyword'>where</span>
<a name="line-138"></a> <span class='varid'>name</span> <span class='keyglyph'>=</span> <span class='varid'>lookup1</span> <span class='varid'>a_name</span> <span class='varid'>al</span>
<a name="line-139"></a> <span class='varid'>transFct</span> <span class='keyglyph'>=</span> <span class='varid'>lexicographicAttributeOrder</span>
<a name="line-140"></a> <span class='varop'>`o`</span>
<a name="line-141"></a> <span class='varid'>normalizeAttributeValues</span> <span class='varid'>n</span> <span class='varid'>dtdPart</span>
<a name="line-142"></a> <span class='varop'>`o`</span>
<a name="line-143"></a> <span class='varid'>setDefaultAttributeValues</span> <span class='varid'>n</span> <span class='varid'>dtdPart</span>
<a name="line-144"></a>
<a name="line-145"></a><span class='definition'>buildTransformationFunctions</span> <span class='keyword'>_</span> <span class='varid'>n</span>
<a name="line-146"></a> <span class='keyglyph'>=</span> <span class='varid'>error</span> <span class='layout'>(</span><span class='str'>"buildTransformationFunctions: illegeal parameter:\n"</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-147"></a>
<a name="line-148"></a>
<a name="line-149"></a>
<a name="line-150"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-151"></a>
<a name="line-152"></a>
<a name="line-153"></a><span class='comment'>-- |</span>
<a name="line-154"></a><span class='comment'>-- Sort the attributes of an element in lexicographic order.</span>
<a name="line-155"></a><span class='comment'>--</span>
<a name="line-156"></a><span class='comment'>-- * returns : a function which takes an element (XTag), sorts its</span>
<a name="line-157"></a><span class='comment'>-- attributes in lexicographic order and returns the changed element</span>
<a name="line-158"></a>
<a name="line-159"></a><a name="lexicographicAttributeOrder"></a><span class='definition'>lexicographicAttributeOrder</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-160"></a><span class='definition'>lexicographicAttributeOrder</span>
<a name="line-161"></a> <span class='keyglyph'>=</span> <span class='varid'>processAttrl</span> <span class='varid'>sortAttrl</span>
<a name="line-162"></a> <span class='keyword'>where</span>
<a name="line-163"></a> <span class='varid'>sortAttrl</span> <span class='varid'>al</span>
<a name="line-164"></a> <span class='keyglyph'>=</span> <span class='varid'>map</span> <span class='layout'>(</span><span class='varid'>al</span> <span class='varop'>!!</span><span class='layout'>)</span> <span class='varid'>ixs</span>
<a name="line-165"></a> <span class='keyword'>where</span>
<a name="line-166"></a> <span class='varid'>ns</span> <span class='keyglyph'>=</span> <span class='varid'>map</span> <span class='varid'>nameOf</span> <span class='varid'>al</span>
<a name="line-167"></a> <span class='varid'>ixs</span> <span class='keyglyph'>=</span> <span class='varid'>map</span> <span class='varid'>snd</span> <span class='varop'>.</span> <span class='varid'>sort</span> <span class='varop'>.</span> <span class='varid'>zip</span> <span class='varid'>ns</span> <span class='varop'>$</span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='num'>0</span><span class='keyglyph'>::</span><span class='conid'>Int</span><span class='layout'>)</span><span class='keyglyph'>..</span><span class='keyglyph'>]</span>
<a name="line-168"></a>
<a name="line-169"></a><span class='comment'>-- |</span>
<a name="line-170"></a><span class='comment'>-- Normalize attribute values.</span>
<a name="line-171"></a><span class='comment'>--</span>
<a name="line-172"></a><span class='comment'>-- * returns : a function which takes an element (XTag), normalizes its</span>
<a name="line-173"></a><span class='comment'>-- attribute values and returns the changed element</span>
<a name="line-174"></a>
<a name="line-175"></a><a name="normalizeAttributeValues"></a><span class='definition'>normalizeAttributeValues</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlFilter</span>
<a name="line-176"></a><span class='definition'>normalizeAttributeValues</span> <span class='varid'>elemDescr</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XDTD</span> <span class='conid'>ELEMENT</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='varid'>dtdPart</span>
<a name="line-177"></a> <span class='keyglyph'>=</span> <span class='varid'>processAttr</span> <span class='varid'>normalizeAttr</span>
<a name="line-178"></a> <span class='keyword'>where</span>
<a name="line-179"></a> <span class='varid'>elemName</span> <span class='keyglyph'>=</span> <span class='varid'>valueOfDTD</span> <span class='varid'>a_name</span> <span class='varid'>elemDescr</span>
<a name="line-180"></a> <span class='varid'>declaredAtts</span> <span class='keyglyph'>=</span> <span class='varid'>isAttlistOfElement</span> <span class='varid'>elemName</span> <span class='varop'>$$</span> <span class='varid'>dtdPart</span>
<a name="line-181"></a>
<a name="line-182"></a> <span class='varid'>normalizeAttr</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-183"></a> <span class='varid'>normalizeAttr</span> <span class='varid'>att</span>
<a name="line-184"></a> <span class='keyglyph'>=</span> <span class='varid'>normalizeAttrValue</span> <span class='layout'>(</span><span class='keyword'>if</span> <span class='varid'>null</span> <span class='varid'>attDescr</span>
<a name="line-185"></a> <span class='keyword'>then</span> <span class='conid'>Nothing</span>
<a name="line-186"></a> <span class='keyword'>else</span> <span class='conid'>Just</span> <span class='layout'>(</span><span class='varid'>head</span> <span class='varid'>attDescr</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varid'>att</span>
<a name="line-187"></a> <span class='keyword'>where</span>
<a name="line-188"></a> <span class='varid'>attDescr</span> <span class='keyglyph'>=</span> <span class='varid'>filter</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>x</span> <span class='keyglyph'>-></span> <span class='layout'>(</span><span class='varid'>valueOfDTD</span> <span class='varid'>a_value</span> <span class='varid'>x</span><span class='layout'>)</span> <span class='varop'>==</span> <span class='varid'>nameOf</span> <span class='varid'>att</span><span class='layout'>)</span> <span class='varid'>declaredAtts</span>
<a name="line-189"></a>
<a name="line-190"></a> <span class='varid'>normalizeAttrValue</span> <span class='keyglyph'>::</span> <span class='conid'>Maybe</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlFilter</span>
<a name="line-191"></a> <span class='varid'>normalizeAttrValue</span> <span class='varid'>descr</span>
<a name="line-192"></a> <span class='keyglyph'>=</span> <span class='varid'>modifyChildren</span> <span class='layout'>(</span><span class='layout'>(</span><span class='varid'>modifyText</span> <span class='layout'>(</span><span class='varid'>normalizeAttributeValue</span> <span class='varid'>descr</span><span class='layout'>)</span> <span class='varop'>$$</span><span class='layout'>)</span> <span class='varop'>.</span> <span class='varid'>xmlTreesToText</span><span class='layout'>)</span>
<a name="line-193"></a>
<a name="line-194"></a><span class='definition'>normalizeAttributeValues</span> <span class='varid'>n</span> <span class='keyword'>_</span>
<a name="line-195"></a> <span class='keyglyph'>=</span> <span class='varid'>error</span> <span class='layout'>(</span><span class='str'>"normalizeAttributeValues: illegeal parameter:\n"</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-196"></a>
<a name="line-197"></a>
<a name="line-198"></a>
<a name="line-199"></a><span class='comment'>-- |</span>
<a name="line-200"></a><span class='comment'>-- Set default attribute values if they are not set.</span>
<a name="line-201"></a><span class='comment'>--</span>
<a name="line-202"></a><span class='comment'>-- * returns : a function which takes an element (XTag), adds missing attribute</span>
<a name="line-203"></a><span class='comment'>-- defaults and returns the changed element</span>
<a name="line-204"></a>
<a name="line-205"></a><a name="setDefaultAttributeValues"></a><span class='definition'>setDefaultAttributeValues</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlTrees</span> <span class='keyglyph'>-></span> <span class='conid'>XmlFilter</span>
<a name="line-206"></a><span class='definition'>setDefaultAttributeValues</span> <span class='varid'>elemDescr</span><span class='keyglyph'>@</span><span class='layout'>(</span><span class='conid'>NTree</span> <span class='layout'>(</span><span class='conid'>XDTD</span> <span class='conid'>ELEMENT</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='keyword'>_</span><span class='layout'>)</span> <span class='varid'>dtdPart</span>
<a name="line-207"></a> <span class='keyglyph'>=</span> <span class='varid'>seqF</span> <span class='layout'>(</span><span class='varid'>map</span> <span class='varid'>setDefault</span> <span class='varid'>defaultAtts</span><span class='layout'>)</span>
<a name="line-208"></a> <span class='keyword'>where</span>
<a name="line-209"></a> <span class='comment'>-- select the element name from the dtd</span>
<a name="line-210"></a> <span class='varid'>elemName</span> <span class='keyglyph'>=</span> <span class='varid'>valueOfDTD</span> <span class='varid'>a_name</span> <span class='varid'>elemDescr</span>
<a name="line-211"></a>
<a name="line-212"></a> <span class='varid'>defaultAtts</span> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='varid'>isFixedAttrKind</span> <span class='comment'>-- select attributes with default values</span>
<a name="line-213"></a> <span class='varop'>`orElse`</span>
<a name="line-214"></a> <span class='varid'>isDefaultAttrKind</span>
<a name="line-215"></a> <span class='layout'>)</span>
<a name="line-216"></a> <span class='varop'>$$</span>
<a name="line-217"></a> <span class='layout'>(</span><span class='varid'>isAttlistOfElement</span> <span class='varid'>elemName</span> <span class='varop'>$$</span> <span class='varid'>dtdPart</span><span class='layout'>)</span>
<a name="line-218"></a>
<a name="line-219"></a> <span class='varid'>setDefault</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='conid'>XmlFilter</span>
<a name="line-220"></a> <span class='varid'>setDefault</span> <span class='varid'>attrDescr</span> <span class='comment'>-- add the default attributes</span>
<a name="line-221"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='varid'>addAttr</span> <span class='varid'>attName</span> <span class='varid'>defaultValue</span> <span class='comment'>-- to tag nodes with missing attributes</span>
<a name="line-222"></a> <span class='varop'>`whenNot`</span>
<a name="line-223"></a> <span class='varid'>hasAttr</span> <span class='varid'>attName</span>
<a name="line-224"></a> <span class='layout'>)</span>
<a name="line-225"></a> <span class='varop'>`when`</span>
<a name="line-226"></a> <span class='varid'>isXTag</span>
<a name="line-227"></a> <span class='keyword'>where</span>
<a name="line-228"></a> <span class='varid'>attName</span> <span class='keyglyph'>=</span> <span class='varid'>valueOfDTD</span> <span class='varid'>a_value</span> <span class='varid'>attrDescr</span>
<a name="line-229"></a> <span class='varid'>defaultValue</span> <span class='keyglyph'>=</span> <span class='varid'>valueOfDTD</span> <span class='varid'>a_default</span> <span class='varid'>attrDescr</span>
<a name="line-230"></a>
<a name="line-231"></a>
<a name="line-232"></a><span class='definition'>setDefaultAttributeValues</span> <span class='varid'>n</span> <span class='keyword'>_</span>
<a name="line-233"></a> <span class='keyglyph'>=</span> <span class='varid'>error</span> <span class='layout'>(</span><span class='str'>"setDefaultAttributeValues: illegeal parameter:\n"</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-234"></a>
<a name="line-235"></a>
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