hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-DOM-NamespaceFilter.html
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<pre><a name="line-1"></a><span class='comment'>-- |</span>
<a name="line-2"></a><span class='comment'>-- Namespace filter</span>
<a name="line-3"></a><span class='comment'>--</span>
<a name="line-4"></a><span class='comment'>-- $Id: NamespaceFilter.hs,v 1.4 2006/11/12 14:53:00 hxml Exp $</span>
<a name="line-5"></a><span class='comment'>--</span>
<a name="line-6"></a><span class='comment'>-- Namespaces are processed with two main filter, 'propagateNamespaces'</span>
<a name="line-7"></a><span class='comment'>-- and 'validateNamespaces'.</span>
<a name="line-8"></a><span class='comment'>--</span>
<a name="line-9"></a><span class='comment'>-- 'propagateNamespaces' takes a XML tree and</span>
<a name="line-10"></a><span class='comment'>-- attaches extra namespace info at every tag name and attribute name.</span>
<a name="line-11"></a><span class='comment'>-- So after processing a tree with 'propagateNamespaces', the access functions</span>
<a name="line-12"></a><span class='comment'>-- "namespaceOf" and "universalNameOf" deliver the associated namespace (or \"\")</span>
<a name="line-13"></a><span class='comment'>-- for tag names and attribute names.</span>
<a name="line-14"></a><span class='comment'>--</span>
<a name="line-15"></a><span class='comment'>-- 'validateNamespaces' checks whether names are wellformed related to the XML namespace definition.</span>
<a name="line-16"></a><span class='comment'>-- whether a legal namespace is declared for all prefixes, and whether attribute names are unique</span>
<a name="line-17"></a><span class='comment'>-- related to universal names.</span>
<a name="line-18"></a>
<a name="line-19"></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'>DOM</span><span class='varop'>.</span><span class='conid'>NamespaceFilter</span>
<a name="line-20"></a> <span class='layout'>(</span> <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'>DOM</span><span class='varop'>.</span><span class='conid'>NamespaceFilter</span>
<a name="line-21"></a> <span class='layout'>,</span> <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'>DOM</span><span class='varop'>.</span><span class='conid'>NamespacePredicates</span>
<a name="line-22"></a> <span class='layout'>)</span>
<a name="line-23"></a><span class='keyword'>where</span>
<a name="line-24"></a>
<a name="line-25"></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-26"></a>
<a name="line-27"></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'>NamespacePredicates</span>
<a name="line-28"></a>
<a name="line-29"></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'>Util</span>
<a name="line-30"></a> <span class='layout'>(</span> <span class='varid'>doubles</span> <span class='layout'>)</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-33"></a><span class='comment'>--</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='comment'>-- |</span>
<a name="line-36"></a><span class='comment'>-- Type for the namespace association list, used when propagating namespaces by</span>
<a name="line-37"></a><span class='comment'>-- modifying the 'QName' values in a tree</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="NamespaceTable"></a><span class='keyword'>type</span> <span class='conid'>NamespaceTable</span> <span class='keyglyph'>=</span> <span class='conid'>NsEnv</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'>-- propagate all namespace declarations \"xmlns:ns=...\" to all</span>
<a name="line-45"></a><span class='comment'>-- tag and attribute nodes of a document.</span>
<a name="line-46"></a><span class='comment'>--</span>
<a name="line-47"></a><span class='comment'>-- This filter does not check for illegal use of namespaces.</span>
<a name="line-48"></a><span class='comment'>-- The real work is done by 'propagateNamespaceEnv'.</span>
<a name="line-49"></a><span class='comment'>--</span>
<a name="line-50"></a><span class='comment'>-- The filter may be applied repeatedly if neccessary.</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="propagateNamespaces"></a><span class='definition'>propagateNamespaces</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-53"></a><span class='definition'>propagateNamespaces</span> <span class='keyglyph'>=</span> <span class='varid'>propagateNamespaceEnv</span> <span class='keyglyph'>[</span> <span class='layout'>(</span><span class='varid'>a_xml</span><span class='layout'>,</span> <span class='varid'>xmlNamespace</span><span class='layout'>)</span><span class='layout'>,</span> <span class='layout'>(</span><span class='varid'>a_xmlns</span><span class='layout'>,</span> <span class='varid'>xmlnsNamespace</span><span class='layout'>)</span> <span class='keyglyph'>]</span>
<a name="line-54"></a>
<a name="line-55"></a><span class='comment'>-- |</span>
<a name="line-56"></a><span class='comment'>-- attaches the namespace info given by the namespace table</span>
<a name="line-57"></a><span class='comment'>-- to a tag node and its attributes and children.</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="propagateNamespaceEnv"></a><span class='definition'>propagateNamespaceEnv</span> <span class='keyglyph'>::</span> <span class='conid'>NamespaceTable</span> <span class='keyglyph'>-></span> <span class='conid'>XmlFilter</span>
<a name="line-60"></a><span class='definition'>propagateNamespaceEnv</span> <span class='varid'>env</span> <span class='varid'>n</span>
<a name="line-61"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>processAttr</span> <span class='layout'>(</span><span class='varid'>attachNamespaceUrisToAttr</span> <span class='varid'>newEnv</span><span class='layout'>)</span>
<a name="line-62"></a> <span class='varop'>.></span>
<a name="line-63"></a> <span class='varid'>processChildren</span> <span class='layout'>(</span><span class='varid'>propagateNamespaceEnv</span> <span class='varid'>newEnv</span><span class='layout'>)</span>
<a name="line-64"></a> <span class='varop'>.></span>
<a name="line-65"></a> <span class='varid'>modifyQName</span> <span class='layout'>(</span><span class='varid'>setNamespace</span> <span class='varid'>newEnv</span><span class='layout'>)</span>
<a name="line-66"></a> <span class='layout'>)</span>
<a name="line-67"></a> <span class='varop'>`when`</span>
<a name="line-68"></a> <span class='varid'>isXTag</span>
<a name="line-69"></a> <span class='layout'>)</span>
<a name="line-70"></a> <span class='varop'>$</span> <span class='varid'>n</span>
<a name="line-71"></a> <span class='keyword'>where</span>
<a name="line-72"></a> <span class='varid'>nsAttrs</span> <span class='keyglyph'>=</span> <span class='varid'>getAttrl</span> <span class='comment'>-- scan all attributes</span>
<a name="line-73"></a> <span class='varop'>.></span>
<a name="line-74"></a> <span class='varid'>isOfAttr</span> <span class='layout'>(</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='layout'>(</span><span class='varid'>px</span><span class='layout'>,</span> <span class='varid'>lp</span><span class='layout'>)</span>
<a name="line-75"></a> <span class='keyglyph'>-></span> <span class='layout'>(</span><span class='varid'>px</span> <span class='varop'>==</span> <span class='varid'>a_xmlns</span> <span class='comment'>-- check for prefix or whole name is "xmlns"</span>
<a name="line-76"></a> <span class='varop'>&&</span>
<a name="line-77"></a> <span class='varid'>lp</span> <span class='varop'>/=</span> <span class='str'>":"</span> <span class='comment'>-- check for none empty local part, "xmlns:" is not a legal name</span>
<a name="line-78"></a> <span class='layout'>)</span>
<a name="line-79"></a> <span class='layout'>)</span>
<a name="line-80"></a> <span class='varop'>.</span> <span class='varid'>span</span> <span class='layout'>(</span><span class='varop'>/=</span> <span class='chr'>':'</span><span class='layout'>)</span> <span class='comment'>-- break the name into a pair ("prefix", ":localPart")</span>
<a name="line-81"></a> <span class='varop'>.</span> <span class='varid'>qualifiedName</span> <span class='comment'>-- select attribute name</span>
<a name="line-82"></a> <span class='layout'>)</span>
<a name="line-83"></a> <span class='varop'>$</span> <span class='varid'>n</span>
<a name="line-84"></a> <span class='varid'>nsDecl</span> <span class='keyglyph'>=</span> <span class='varid'>zip</span> <span class='layout'>(</span><span class='varid'>map</span> <span class='layout'>(</span><span class='varid'>drop</span> <span class='num'>1</span> <span class='comment'>-- drop the ":", empty local part represents default name space</span>
<a name="line-85"></a> <span class='varop'>.</span> <span class='varid'>snd</span> <span class='comment'>-- take the local part with leading ":"</span>
<a name="line-86"></a> <span class='varop'>.</span> <span class='varid'>span</span> <span class='layout'>(</span><span class='varop'>/=</span> <span class='chr'>':'</span><span class='layout'>)</span> <span class='comment'>-- break it like above</span>
<a name="line-87"></a> <span class='varop'>.</span> <span class='varid'>nameOf</span> <span class='comment'>-- select attribute name</span>
<a name="line-88"></a> <span class='layout'>)</span> <span class='varid'>nsAttrs</span><span class='layout'>)</span>
<a name="line-89"></a> <span class='layout'>(</span><span class='varid'>map</span> <span class='layout'>(</span><span class='varid'>xshow</span>
<a name="line-90"></a> <span class='varop'>.</span>
<a name="line-91"></a> <span class='varid'>getChildren</span>
<a name="line-92"></a> <span class='layout'>)</span> <span class='varid'>nsAttrs</span><span class='layout'>)</span>
<a name="line-93"></a> <span class='varid'>newEnv</span> <span class='keyglyph'>=</span> <span class='varid'>addEntries</span> <span class='varid'>nsDecl</span> <span class='varid'>env</span>
<a name="line-94"></a>
<a name="line-95"></a> <span class='varid'>attachNamespaceUrisToAttr</span> <span class='keyglyph'>::</span> <span class='conid'>NamespaceTable</span> <span class='keyglyph'>-></span> <span class='conid'>XmlFilter</span>
<a name="line-96"></a> <span class='varid'>attachNamespaceUrisToAttr</span> <span class='varid'>attrEnv</span>
<a name="line-97"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='varid'>isOfAttr</span> <span class='layout'>(</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='layout'>(</span><span class='varid'>px</span><span class='layout'>,</span> <span class='varid'>lp</span><span class='layout'>)</span>
<a name="line-98"></a> <span class='keyglyph'>-></span> <span class='layout'>(</span> <span class='layout'>(</span><span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>null</span> <span class='varop'>.</span> <span class='varid'>drop</span> <span class='num'>1</span><span class='layout'>)</span> <span class='varid'>lp</span> <span class='comment'>-- prefix and local part must not be empty</span>
<a name="line-99"></a> <span class='varop'>&&</span>
<a name="line-100"></a> <span class='layout'>(</span><span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>null</span><span class='layout'>)</span> <span class='varid'>px</span>
<a name="line-101"></a> <span class='layout'>)</span>
<a name="line-102"></a> <span class='layout'>)</span>
<a name="line-103"></a> <span class='varop'>.</span> <span class='varid'>span</span> <span class='layout'>(</span><span class='varop'>/=</span> <span class='chr'>':'</span><span class='layout'>)</span> <span class='comment'>-- break the name into a pair ("prefix", ":localPart")</span>
<a name="line-104"></a> <span class='varop'>.</span> <span class='varid'>qualifiedName</span> <span class='comment'>-- select attribute name</span>
<a name="line-105"></a> <span class='layout'>)</span>
<a name="line-106"></a> <span class='varop'>`guards`</span>
<a name="line-107"></a> <span class='varid'>modifyQName</span> <span class='layout'>(</span><span class='varid'>setNamespace</span> <span class='varid'>attrEnv</span><span class='layout'>)</span>
<a name="line-108"></a> <span class='layout'>)</span>
<a name="line-109"></a> <span class='varop'>`orElse`</span>
<a name="line-110"></a> <span class='layout'>(</span> <span class='varid'>modifyQName</span> <span class='layout'>(</span><span class='varid'>const</span> <span class='varid'>xmlnsQN</span><span class='layout'>)</span> <span class='comment'>-- "xmlns" ist the only attr name without prefix but with an associated namespace URI</span>
<a name="line-111"></a> <span class='varop'>`when`</span>
<a name="line-112"></a> <span class='varid'>isAttr</span> <span class='varid'>a_xmlns</span>
<a name="line-113"></a> <span class='layout'>)</span>
<a name="line-114"></a>
<a name="line-115"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-116"></a>
<a name="line-117"></a><span class='comment'>-- |</span>
<a name="line-118"></a><span class='comment'>-- validate the namespace constraints in a whole tree.</span>
<a name="line-119"></a><span class='comment'>-- result is the list of errors concerning namespaces.</span>
<a name="line-120"></a><span class='comment'>-- Work is done by applying 'validate1Namespaces' to all nodes.</span>
<a name="line-121"></a><span class='comment'>-- Predicates 'isWellformedQName', 'isWellformedQualifiedName', 'isDeclaredNamespace'</span>
<a name="line-122"></a><span class='comment'>-- and 'isWellformedNSDecl' are applied to the appropriate tags and attributes.</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="validateNamespaces"></a><span class='definition'>validateNamespaces</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-125"></a><span class='definition'>validateNamespaces</span>
<a name="line-126"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='keyglyph'>[</span> <span class='varid'>isRoot</span>
<a name="line-127"></a> <span class='conop'>:-></span> <span class='varid'>getChildren</span> <span class='varop'>.></span> <span class='varid'>validateNamespaces</span> <span class='comment'>-- root is correct by definition</span>
<a name="line-128"></a> <span class='layout'>,</span> <span class='varid'>this</span>
<a name="line-129"></a> <span class='conop'>:-></span> <span class='varid'>multi</span> <span class='varid'>validate1Namespaces</span>
<a name="line-130"></a> <span class='keyglyph'>]</span>
<a name="line-131"></a>
<a name="line-132"></a><span class='comment'>-- |</span>
<a name="line-133"></a><span class='comment'>-- a single node for namespace constrains.</span>
<a name="line-134"></a>
<a name="line-135"></a><a name="validate1Namespaces"></a><span class='definition'>validate1Namespaces</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-136"></a><span class='definition'>validate1Namespaces</span>
<a name="line-137"></a> <span class='keyglyph'>=</span> <span class='varid'>choice</span> <span class='keyglyph'>[</span> <span class='varid'>isXTag</span>
<a name="line-138"></a> <span class='conop'>:-></span>
<a name="line-139"></a> <span class='varid'>cat</span> <span class='keyglyph'>[</span> <span class='varid'>isOfTag</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isWellformedQName</span> <span class='layout'>)</span>
<a name="line-140"></a> <span class='varop'>`guards`</span>
<a name="line-141"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"tag name "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>nameOf</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>++</span> <span class='str'>" is not a wellformed qualified name"</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-142"></a>
<a name="line-143"></a> <span class='layout'>,</span> <span class='varid'>isOfTag</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isDeclaredNamespace</span> <span class='layout'>)</span>
<a name="line-144"></a> <span class='varop'>`guards`</span>
<a name="line-145"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"namespace for prefix in tag name "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>nameOf</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>++</span> <span class='str'>" is undefined"</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-146"></a>
<a name="line-147"></a> <span class='layout'>,</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='layout'>(</span> <span class='keyword'>let</span>
<a name="line-148"></a> <span class='varid'>dbls</span> <span class='keyglyph'>=</span> <span class='varid'>doubles</span> <span class='layout'>(</span><span class='layout'>(</span><span class='varid'>map</span> <span class='varid'>universalNameOf</span> <span class='varop'>.</span> <span class='varid'>getAttrl</span><span class='layout'>)</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-149"></a> <span class='keyword'>in</span>
<a name="line-150"></a> <span class='keyword'>if</span> <span class='varid'>null</span> <span class='varid'>dbls</span>
<a name="line-151"></a> <span class='keyword'>then</span> <span class='varid'>none</span>
<a name="line-152"></a> <span class='keyword'>else</span> <span class='varid'>err</span> <span class='layout'>(</span> <span class='str'>"multiple occurences of universal names for attributes of tag "</span>
<a name="line-153"></a> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>nameOf</span> <span class='varid'>n</span><span class='layout'>)</span>
<a name="line-154"></a> <span class='varop'>++</span> <span class='str'>" : "</span> <span class='varop'>++</span> <span class='varid'>foldr1</span> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>x</span> <span class='varid'>y</span> <span class='keyglyph'>-></span> <span class='varid'>x</span> <span class='varop'>++</span> <span class='str'>", "</span> <span class='varop'>++</span> <span class='varid'>y</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>map</span> <span class='varid'>show</span> <span class='varid'>dbls</span><span class='layout'>)</span>
<a name="line-155"></a> <span class='layout'>)</span>
<a name="line-156"></a> <span class='layout'>)</span> <span class='varop'>$</span> <span class='varid'>n</span>
<a name="line-157"></a> <span class='layout'>)</span>
<a name="line-158"></a>
<a name="line-159"></a> <span class='layout'>,</span> <span class='varid'>getAttrl</span> <span class='varop'>.></span> <span class='varid'>validate1Namespaces</span>
<a name="line-160"></a> <span class='keyglyph'>]</span>
<a name="line-161"></a>
<a name="line-162"></a> <span class='layout'>,</span> <span class='varid'>isXAttr</span>
<a name="line-163"></a> <span class='conop'>:-></span>
<a name="line-164"></a> <span class='varid'>cat</span> <span class='keyglyph'>[</span> <span class='varid'>isOfAttr</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isWellformedQName</span> <span class='layout'>)</span>
<a name="line-165"></a> <span class='varop'>`guards`</span>
<a name="line-166"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"attribute name "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>nameOf</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>++</span> <span class='str'>" is not a wellformed qualified name"</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-167"></a>
<a name="line-168"></a> <span class='layout'>,</span> <span class='varid'>isOfAttr</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isDeclaredNamespace</span> <span class='layout'>)</span>
<a name="line-169"></a> <span class='varop'>`guards`</span>
<a name="line-170"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"namespace for prefix in attribute name "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>nameOf</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>++</span> <span class='str'>" is undefined"</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-171"></a>
<a name="line-172"></a> <span class='layout'>,</span> <span class='layout'>(</span> <span class='varid'>hasPrefix</span> <span class='varid'>a_xmlns</span> <span class='varop'>.></span> <span class='varid'>neg</span> <span class='layout'>(</span><span class='varid'>xmlTreesToText</span> <span class='varop'>.</span> <span class='varid'>getChildren</span><span class='layout'>)</span> <span class='layout'>)</span>
<a name="line-173"></a> <span class='varop'>`guards`</span>
<a name="line-174"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"namespace value of namespace declaration for "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>nameOf</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>++</span> <span class='str'>" has no value"</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-175"></a>
<a name="line-176"></a> <span class='layout'>,</span> <span class='varid'>isOfAttr</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isWellformedNSDecl</span> <span class='layout'>)</span>
<a name="line-177"></a> <span class='varop'>`guards`</span>
<a name="line-178"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"illegal namespace declaration with reserved prefix "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>localPartOf</span> <span class='varid'>n</span><span class='layout'>)</span> <span class='varop'>++</span> <span class='str'>" starting with \"xml\""</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-179"></a> <span class='keyglyph'>]</span>
<a name="line-180"></a>
<a name="line-181"></a> <span class='layout'>,</span> <span class='varid'>isXDTD</span>
<a name="line-182"></a> <span class='conop'>:-></span>
<a name="line-183"></a> <span class='varid'>cat</span> <span class='keyglyph'>[</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>isDoctype</span> <span class='varop'>+++</span> <span class='varid'>isAttlist</span> <span class='varop'>+++</span> <span class='varid'>isElement</span> <span class='varop'>+++</span> <span class='varid'>isDTDName</span> <span class='layout'>)</span>
<a name="line-184"></a> <span class='varop'>.></span>
<a name="line-185"></a> <span class='varid'>isOf</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isWellformedQualifiedName</span> <span class='varop'>.</span> <span class='varid'>valueOfDTD</span> <span class='varid'>a_name</span> <span class='layout'>)</span>
<a name="line-186"></a> <span class='layout'>)</span>
<a name="line-187"></a> <span class='varop'>`guards`</span>
<a name="line-188"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"a DTD part contains a not wellformed qualified Name: "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>valueOfDTD</span> <span class='varid'>a_name</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-189"></a>
<a name="line-190"></a> <span class='layout'>,</span> <span class='layout'>(</span> <span class='varid'>isAttlist</span>
<a name="line-191"></a> <span class='varop'>.></span>
<a name="line-192"></a> <span class='varid'>isOf</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isWellformedQualifiedName</span> <span class='varop'>.</span> <span class='varid'>valueOfDTD</span> <span class='varid'>a_value</span> <span class='layout'>)</span>
<a name="line-193"></a> <span class='layout'>)</span>
<a name="line-194"></a> <span class='varop'>`guards`</span>
<a name="line-195"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"an ATTLIST declaration contains as attribute name a not wellformed qualified Name: "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>valueOfDTD</span> <span class='varid'>a_value</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-196"></a>
<a name="line-197"></a> <span class='layout'>,</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>isEntity</span> <span class='varop'>+++</span> <span class='varid'>isParameterEntity</span> <span class='varop'>+++</span> <span class='varid'>isNotation</span> <span class='layout'>)</span>
<a name="line-198"></a> <span class='varop'>.></span>
<a name="line-199"></a> <span class='varid'>isOf</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isNCName</span> <span class='varop'>.</span> <span class='varid'>valueOfDTD</span> <span class='varid'>a_name</span> <span class='layout'>)</span>
<a name="line-200"></a> <span class='layout'>)</span>
<a name="line-201"></a> <span class='varop'>`guards`</span>
<a name="line-202"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"an entity or notation declaration contains a not wellformed NCName: "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>valueOfDTD</span> <span class='varid'>a_name</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-203"></a> <span class='keyglyph'>]</span>
<a name="line-204"></a> <span class='layout'>,</span> <span class='varid'>isXPi</span>
<a name="line-205"></a> <span class='conop'>:-></span>
<a name="line-206"></a> <span class='layout'>(</span> <span class='varid'>isOf</span> <span class='layout'>(</span> <span class='varid'>not</span> <span class='varop'>.</span> <span class='varid'>isNCName</span> <span class='varop'>.</span> <span class='varid'>nameOf</span> <span class='layout'>)</span>
<a name="line-207"></a> <span class='varop'>`guards`</span>
<a name="line-208"></a> <span class='layout'>(</span><span class='keyglyph'>\</span> <span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>err</span> <span class='layout'>(</span><span class='str'>"a PI contains a not wellformed NCName: "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='layout'>(</span><span class='varid'>nameOf</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varid'>n</span> <span class='layout'>)</span>
<a name="line-209"></a> <span class='layout'>)</span>
<a name="line-210"></a> <span class='keyglyph'>]</span>
<a name="line-211"></a>
<a name="line-212"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-213"></a>
<a name="line-214"></a><a name="isNamespaceDecl"></a><span class='definition'>isNamespaceDecl</span> <span class='keyglyph'>::</span> <span class='conid'>XmlFilter</span>
<a name="line-215"></a><span class='definition'>isNamespaceDecl</span>
<a name="line-216"></a> <span class='keyglyph'>=</span> <span class='varid'>isOfAttr</span> <span class='varid'>xmlnsName</span>
<a name="line-217"></a> <span class='keyword'>where</span>
<a name="line-218"></a> <span class='varid'>xmlnsName</span> <span class='keyglyph'>::</span> <span class='conid'>AttrName</span> <span class='keyglyph'>-></span> <span class='conid'>Bool</span>
<a name="line-219"></a> <span class='varid'>xmlnsName</span> <span class='varid'>a</span>
<a name="line-220"></a> <span class='keyglyph'>=</span> <span class='varid'>px</span> <span class='varop'>==</span> <span class='varid'>a_xmlns</span>
<a name="line-221"></a> <span class='varop'>&&</span>
<a name="line-222"></a> <span class='layout'>(</span> <span class='varid'>null</span> <span class='varid'>ln</span> <span class='varop'>||</span> <span class='varid'>head</span> <span class='varid'>ln</span> <span class='varop'>==</span> <span class='chr'>':'</span><span class='layout'>)</span>
<a name="line-223"></a> <span class='keyword'>where</span>
<a name="line-224"></a> <span class='layout'>(</span><span class='varid'>px</span><span class='layout'>,</span> <span class='varid'>ln</span><span class='layout'>)</span> <span class='keyglyph'>=</span> <span class='varid'>splitAt</span> <span class='num'>5</span> <span class='varop'>.</span> <span class='varid'>qualifiedName</span> <span class='varop'>$</span> <span class='varid'>a</span>
<a name="line-225"></a>
<a name="line-226"></a><span class='comment'>-- -----------------------------------------------------------------------------</span>
</pre></body>
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