hxt-8.0.0: doc/hdoc/src/Text-XML-HXT-RelaxNG-CreatePattern.html
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<pre><a name="line-1"></a><span class='comment'>-- |</span>
<a name="line-2"></a><span class='comment'>-- </span>
<a name="line-3"></a><span class='comment'>-- Creates the 'Pattern' datastructure from a simplified Relax NG schema. </span>
<a name="line-4"></a><span class='comment'>-- The created datastructure is used in the validation algorithm</span>
<a name="line-5"></a><span class='comment'>-- (see also: "Text.XML.HXT.RelaxNG.Validation")</span>
<a name="line-6"></a>
<a name="line-7"></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'>RelaxNG</span><span class='varop'>.</span><span class='conid'>CreatePattern</span>
<a name="line-8"></a> <span class='layout'>(</span> <span class='varid'>createPatternFromXmlTree</span>
<a name="line-9"></a> <span class='layout'>,</span> <span class='varid'>createNameClass</span>
<a name="line-10"></a> <span class='layout'>,</span> <span class='varid'>firstChild</span>
<a name="line-11"></a> <span class='layout'>,</span> <span class='varid'>lastChild</span>
<a name="line-12"></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'>RelaxNG</span><span class='varop'>.</span><span class='conid'>PatternFunctions</span>
<a name="line-13"></a> <span class='layout'>)</span>
<a name="line-14"></a><span class='keyword'>where</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='keyword'>import</span> <span class='conid'>Control</span><span class='varop'>.</span><span class='conid'>Arrow</span><span class='varop'>.</span><span class='conid'>ListArrows</span>
<a name="line-17"></a>
<a name="line-18"></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'>Interface</span>
<a name="line-19"></a>
<a name="line-20"></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'>Arrow</span><span class='varop'>.</span><span class='conid'>XmlArrow</span>
<a name="line-21"></a>
<a name="line-22"></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'>RelaxNG</span><span class='varop'>.</span><span class='conid'>DataTypes</span>
<a name="line-23"></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'>RelaxNG</span><span class='varop'>.</span><span class='conid'>BasicArrows</span>
<a name="line-24"></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'>RelaxNG</span><span class='varop'>.</span><span class='conid'>PatternFunctions</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>Maybe</span>
<a name="line-27"></a> <span class='layout'>(</span> <span class='varid'>fromMaybe</span> <span class='layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='keyword'>import</span> <span class='conid'>Data</span><span class='varop'>.</span><span class='conid'>List</span>
<a name="line-30"></a> <span class='layout'>(</span> <span class='varid'>isPrefixOf</span> <span class='layout'>)</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='comment'>-- ------------------------------------------------------------</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='comment'>-- | Creates the 'Pattern' datastructure from a simplified Relax NG schema.</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="createPatternFromXmlTree"></a><span class='definition'>createPatternFromXmlTree</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-37"></a><span class='definition'>createPatternFromXmlTree</span> <span class='keyglyph'>=</span> <span class='varid'>createPatternFromXml</span> <span class='varop'>$<</span> <span class='varid'>createEnv</span>
<a name="line-38"></a> <span class='keyword'>where</span>
<a name="line-39"></a> <span class='comment'>-- | Selects all define-pattern and creates an environment list.</span>
<a name="line-40"></a> <span class='comment'>-- Each list entry maps the define name to the children of the define-pattern.</span>
<a name="line-41"></a> <span class='comment'>-- The map is used to replace a ref-pattern with the referenced define-pattern.</span>
<a name="line-42"></a> <span class='varid'>createEnv</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Env</span>
<a name="line-43"></a> <span class='varid'>createEnv</span> <span class='keyglyph'>=</span> <span class='varid'>listA</span> <span class='varop'>$</span> <span class='varid'>deep</span> <span class='varid'>isRngDefine</span>
<a name="line-44"></a> <span class='varop'>>>></span>
<a name="line-45"></a> <span class='layout'>(</span><span class='varid'>getRngAttrName</span> <span class='varop'>&&&</span> <span class='varid'>getChildren</span><span class='layout'>)</span>
<a name="line-46"></a>
<a name="line-47"></a>
<a name="line-48"></a><span class='comment'>-- | Transforms each XML-element to the corresponding pattern</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="createPatternFromXml"></a><span class='definition'>createPatternFromXml</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-51"></a><span class='definition'>createPatternFromXml</span> <span class='varid'>env</span>
<a name="line-52"></a> <span class='keyglyph'>=</span> <span class='varid'>choiceA</span> <span class='keyglyph'>[</span>
<a name="line-53"></a> <span class='varid'>isRoot</span> <span class='conop'>:-></span> <span class='varid'>processRoot</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-54"></a> <span class='varid'>isRngEmpty</span> <span class='conop'>:-></span> <span class='varid'>constA</span> <span class='conid'>Empty</span><span class='layout'>,</span>
<a name="line-55"></a> <span class='varid'>isRngNotAllowed</span> <span class='conop'>:-></span> <span class='varid'>mkNotAllowed</span><span class='layout'>,</span>
<a name="line-56"></a> <span class='varid'>isRngText</span> <span class='conop'>:-></span> <span class='varid'>constA</span> <span class='conid'>Text</span><span class='layout'>,</span>
<a name="line-57"></a> <span class='varid'>isRngChoice</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxChoice</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-58"></a> <span class='varid'>isRngInterleave</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxInterleave</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-59"></a> <span class='varid'>isRngGroup</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxGroup</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-60"></a> <span class='varid'>isRngOneOrMore</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxOneOrMore</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-61"></a> <span class='varid'>isRngList</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxList</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-62"></a> <span class='varid'>isRngData</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxData</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-63"></a> <span class='varid'>isRngValue</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxValue</span><span class='layout'>,</span>
<a name="line-64"></a> <span class='varid'>isRngAttribute</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxAttribute</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-65"></a> <span class='varid'>isRngElement</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxElement</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-66"></a> <span class='varid'>isRngRef</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxRef</span> <span class='varid'>env</span><span class='layout'>,</span>
<a name="line-67"></a> <span class='varid'>this</span> <span class='conop'>:-></span> <span class='varid'>mkRelaxError</span> <span class='str'>""</span>
<a name="line-68"></a> <span class='keyglyph'>]</span>
<a name="line-69"></a>
<a name="line-70"></a>
<a name="line-71"></a><a name="processRoot"></a><span class='definition'>processRoot</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-72"></a><span class='definition'>processRoot</span> <span class='varid'>env</span>
<a name="line-73"></a> <span class='keyglyph'>=</span> <span class='varid'>getChildren</span>
<a name="line-74"></a> <span class='varop'>>>></span>
<a name="line-75"></a> <span class='varid'>choiceA</span> <span class='keyglyph'>[</span>
<a name="line-76"></a> <span class='varid'>isRngRelaxError</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>mkRelaxError</span> <span class='varop'>$<</span> <span class='varid'>getRngAttrDescr</span><span class='layout'>)</span><span class='layout'>,</span>
<a name="line-77"></a> <span class='varid'>isRngGrammar</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>processGrammar</span> <span class='varid'>env</span><span class='layout'>)</span><span class='layout'>,</span>
<a name="line-78"></a> <span class='varid'>this</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>mkRelaxError</span> <span class='str'>"no grammar-pattern in schema"</span><span class='layout'>)</span>
<a name="line-79"></a> <span class='keyglyph'>]</span>
<a name="line-80"></a>
<a name="line-81"></a>
<a name="line-82"></a><a name="processGrammar"></a><span class='definition'>processGrammar</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-83"></a><span class='definition'>processGrammar</span> <span class='varid'>env</span>
<a name="line-84"></a> <span class='keyglyph'>=</span> <span class='varid'>getChildren</span>
<a name="line-85"></a> <span class='varop'>>>></span>
<a name="line-86"></a> <span class='varid'>choiceA</span> <span class='keyglyph'>[</span>
<a name="line-87"></a> <span class='varid'>isRngDefine</span> <span class='conop'>:-></span> <span class='varid'>none</span><span class='layout'>,</span>
<a name="line-88"></a> <span class='varid'>isRngRelaxError</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>mkRelaxError</span> <span class='varop'>$<</span> <span class='varid'>getAttrValue</span> <span class='str'>"desc"</span><span class='layout'>)</span><span class='layout'>,</span>
<a name="line-89"></a> <span class='varid'>isRngStart</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>createPatternFromXml</span> <span class='varid'>env</span><span class='layout'>)</span><span class='layout'>,</span>
<a name="line-90"></a> <span class='varid'>this</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>mkRelaxError</span> <span class='str'>"no start-pattern in schema"</span><span class='layout'>)</span>
<a name="line-91"></a> <span class='keyglyph'>]</span>
<a name="line-92"></a>
<a name="line-93"></a>
<a name="line-94"></a><a name="mkRelaxRef"></a><span class='comment'>{- |
<a name="line-95"></a> Transforms a ref-element.
<a name="line-96"></a> The value of the name-attribute is looked up in the environment list
<a name="line-97"></a> to find the corresponding define-pattern.
<a name="line-98"></a> Haskells lazy-evaluation is used to transform circular structures.
<a name="line-99"></a>-}</span>
<a name="line-100"></a><span class='definition'>mkRelaxRef</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-101"></a><span class='definition'>mkRelaxRef</span> <span class='varid'>e</span>
<a name="line-102"></a> <span class='keyglyph'>=</span> <span class='varid'>getRngAttrName</span>
<a name="line-103"></a> <span class='varop'>>>></span>
<a name="line-104"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>fromMaybe</span> <span class='layout'>(</span><span class='varid'>notAllowed</span> <span class='varop'>$</span> <span class='str'>"define-pattern with name "</span> <span class='varop'>++</span> <span class='varid'>n</span> <span class='varop'>++</span> <span class='str'>" not found"</span><span class='layout'>)</span>
<a name="line-105"></a> <span class='varop'>.</span> <span class='varid'>lookup</span> <span class='varid'>n</span> <span class='varop'>$</span> <span class='varid'>transformEnv</span> <span class='varid'>e</span>
<a name="line-106"></a> <span class='layout'>)</span>
<a name="line-107"></a> <span class='keyword'>where</span>
<a name="line-108"></a> <span class='varid'>transformEnv</span> <span class='keyglyph'>::</span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='conid'>String</span><span class='layout'>,</span> <span class='conid'>XmlTree</span><span class='layout'>)</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='conid'>String</span><span class='layout'>,</span> <span class='conid'>Pattern</span><span class='layout'>)</span><span class='keyglyph'>]</span>
<a name="line-109"></a> <span class='varid'>transformEnv</span> <span class='varid'>env</span> <span class='keyglyph'>=</span> <span class='keyglyph'>[</span> <span class='layout'>(</span><span class='varid'>treeName</span><span class='layout'>,</span> <span class='layout'>(</span><span class='varid'>transformEnvElem</span> <span class='varid'>tree</span> <span class='varid'>env</span><span class='layout'>)</span><span class='layout'>)</span> <span class='keyglyph'>|</span> <span class='layout'>(</span><span class='varid'>treeName</span><span class='layout'>,</span> <span class='varid'>tree</span><span class='layout'>)</span> <span class='keyglyph'><-</span> <span class='varid'>env</span><span class='keyglyph'>]</span>
<a name="line-110"></a> <span class='varid'>transformEnvElem</span> <span class='keyglyph'>::</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>-></span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='conid'>String</span><span class='layout'>,</span> <span class='conid'>XmlTree</span><span class='layout'>)</span><span class='keyglyph'>]</span> <span class='keyglyph'>-></span> <span class='conid'>Pattern</span>
<a name="line-111"></a> <span class='varid'>transformEnvElem</span> <span class='varid'>tree</span> <span class='varid'>env</span> <span class='keyglyph'>=</span> <span class='varid'>head</span> <span class='varop'>$</span> <span class='varid'>runLA</span> <span class='layout'>(</span><span class='varid'>createPatternFromXml</span> <span class='varid'>env</span><span class='layout'>)</span> <span class='varid'>tree</span>
<a name="line-112"></a>
<a name="line-113"></a>
<a name="line-114"></a><a name="mkNotAllowed"></a><span class='comment'>-- | Transforms a notAllowed-element.</span>
<a name="line-115"></a><span class='definition'>mkNotAllowed</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-116"></a><span class='definition'>mkNotAllowed</span> <span class='keyglyph'>=</span> <span class='varid'>constA</span> <span class='varop'>$</span> <span class='varid'>notAllowed</span> <span class='str'>"notAllowed-pattern in Relax NG schema definition"</span>
<a name="line-117"></a>
<a name="line-118"></a>
<a name="line-119"></a><a name="mkRelaxError"></a><span class='comment'>-- | Creates an error message.</span>
<a name="line-120"></a><span class='definition'>mkRelaxError</span> <span class='keyglyph'>::</span> <span class='conid'>String</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-121"></a><span class='definition'>mkRelaxError</span> <span class='varid'>errStr</span>
<a name="line-122"></a> <span class='keyglyph'>=</span> <span class='varid'>choiceA</span> <span class='keyglyph'>[</span>
<a name="line-123"></a> <span class='varid'>isRngRelaxError</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>getRngAttrDescr</span> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='varid'>notAllowed</span><span class='layout'>)</span><span class='layout'>,</span>
<a name="line-124"></a> <span class='varid'>isElem</span> <span class='conop'>:-></span> <span class='layout'>(</span> <span class='varid'>getName</span>
<a name="line-125"></a> <span class='varop'>>>></span>
<a name="line-126"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>notAllowed</span> <span class='varop'>$</span> <span class='str'>"Pattern "</span> <span class='varop'>++</span> <span class='varid'>n</span> <span class='varop'>++</span>
<a name="line-127"></a> <span class='str'>" is not allowed in Relax NG schema"</span>
<a name="line-128"></a> <span class='layout'>)</span>
<a name="line-129"></a> <span class='layout'>)</span><span class='layout'>,</span>
<a name="line-130"></a> <span class='varid'>isAttr</span> <span class='conop'>:-></span> <span class='layout'>(</span> <span class='varid'>getName</span>
<a name="line-131"></a> <span class='varop'>>>></span>
<a name="line-132"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='varid'>notAllowed</span> <span class='varop'>$</span> <span class='str'>"Attribute "</span> <span class='varop'>++</span> <span class='varid'>n</span> <span class='varop'>++</span>
<a name="line-133"></a> <span class='str'>" is not allowed in Relax NG schema"</span>
<a name="line-134"></a> <span class='layout'>)</span>
<a name="line-135"></a> <span class='layout'>)</span><span class='layout'>,</span>
<a name="line-136"></a> <span class='varid'>isError</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>getErrorMsg</span> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='varid'>notAllowed</span><span class='layout'>)</span><span class='layout'>,</span>
<a name="line-137"></a> <span class='varid'>this</span> <span class='conop'>:-></span> <span class='layout'>(</span><span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>e</span> <span class='keyglyph'>-></span> <span class='varid'>notAllowed</span> <span class='varop'>$</span> <span class='keyword'>if</span> <span class='varid'>errStr</span> <span class='varop'>/=</span> <span class='str'>""</span>
<a name="line-138"></a> <span class='keyword'>then</span> <span class='varid'>errStr</span>
<a name="line-139"></a> <span class='keyword'>else</span> <span class='str'>"Can't create pattern from "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>e</span><span class='layout'>)</span>
<a name="line-140"></a> <span class='layout'>)</span>
<a name="line-141"></a> <span class='keyglyph'>]</span>
<a name="line-142"></a>
<a name="line-143"></a>
<a name="line-144"></a><a name="mkRelaxChoice"></a><span class='comment'>-- | Transforms a choice-element.</span>
<a name="line-145"></a><span class='definition'>mkRelaxChoice</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-146"></a><span class='definition'>mkRelaxChoice</span> <span class='varid'>env</span>
<a name="line-147"></a> <span class='keyglyph'>=</span> <span class='varid'>ifA</span> <span class='layout'>(</span> <span class='varid'>getChildren</span> <span class='varop'>>>.</span>
<a name="line-148"></a> <span class='layout'>(</span> <span class='keyglyph'>\</span> <span class='varid'>l</span> <span class='keyglyph'>-></span> <span class='keyword'>if</span> <span class='varid'>length</span> <span class='varid'>l</span> <span class='varop'>==</span> <span class='num'>1</span> <span class='keyword'>then</span> <span class='varid'>l</span> <span class='keyword'>else</span> <span class='conid'>[]</span> <span class='layout'>)</span>
<a name="line-149"></a> <span class='layout'>)</span>
<a name="line-150"></a> <span class='layout'>(</span> <span class='varid'>createPatternFromXml</span> <span class='varid'>env</span> <span class='layout'>)</span>
<a name="line-151"></a> <span class='layout'>(</span> <span class='varid'>getTwoChildrenPattern</span> <span class='varid'>env</span> <span class='varop'>>>></span> <span class='varid'>arr2</span> <span class='conid'>Choice</span> <span class='layout'>)</span>
<a name="line-152"></a>
<a name="line-153"></a><a name="mkRelaxInterleave"></a><span class='comment'>-- | Transforms a interleave-element.</span>
<a name="line-154"></a><span class='definition'>mkRelaxInterleave</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-155"></a><span class='definition'>mkRelaxInterleave</span> <span class='varid'>env</span>
<a name="line-156"></a> <span class='keyglyph'>=</span> <span class='varid'>getTwoChildrenPattern</span> <span class='varid'>env</span>
<a name="line-157"></a> <span class='varop'>>>></span>
<a name="line-158"></a> <span class='varid'>arr2</span> <span class='conid'>Interleave</span>
<a name="line-159"></a>
<a name="line-160"></a>
<a name="line-161"></a><a name="mkRelaxGroup"></a><span class='comment'>-- | Transforms a group-element.</span>
<a name="line-162"></a><span class='definition'>mkRelaxGroup</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-163"></a><span class='definition'>mkRelaxGroup</span> <span class='varid'>env</span>
<a name="line-164"></a> <span class='keyglyph'>=</span> <span class='varid'>getTwoChildrenPattern</span> <span class='varid'>env</span>
<a name="line-165"></a> <span class='varop'>>>></span>
<a name="line-166"></a> <span class='varid'>arr2</span> <span class='conid'>Group</span>
<a name="line-167"></a>
<a name="line-168"></a>
<a name="line-169"></a><a name="mkRelaxOneOrMore"></a><span class='comment'>-- | Transforms a oneOrMore-element.</span>
<a name="line-170"></a><span class='definition'>mkRelaxOneOrMore</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-171"></a><span class='definition'>mkRelaxOneOrMore</span> <span class='varid'>env</span>
<a name="line-172"></a> <span class='keyglyph'>=</span> <span class='varid'>getOneChildPattern</span> <span class='varid'>env</span>
<a name="line-173"></a> <span class='varop'>>>></span>
<a name="line-174"></a> <span class='varid'>arr</span> <span class='conid'>OneOrMore</span>
<a name="line-175"></a>
<a name="line-176"></a>
<a name="line-177"></a><a name="mkRelaxList"></a><span class='comment'>-- | Transforms a list-element.</span>
<a name="line-178"></a><span class='definition'>mkRelaxList</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-179"></a><span class='definition'>mkRelaxList</span> <span class='varid'>env</span>
<a name="line-180"></a> <span class='keyglyph'>=</span> <span class='varid'>getOneChildPattern</span> <span class='varid'>env</span>
<a name="line-181"></a> <span class='varop'>>>></span>
<a name="line-182"></a> <span class='varid'>arr</span> <span class='conid'>List</span>
<a name="line-183"></a>
<a name="line-184"></a>
<a name="line-185"></a><a name="mkRelaxData"></a><span class='comment'>-- | Transforms a data- or dataExcept-element.</span>
<a name="line-186"></a><span class='definition'>mkRelaxData</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-187"></a><span class='definition'>mkRelaxData</span> <span class='varid'>env</span>
<a name="line-188"></a> <span class='keyglyph'>=</span> <span class='varid'>ifA</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isRngExcept</span><span class='layout'>)</span>
<a name="line-189"></a> <span class='layout'>(</span><span class='varid'>processDataExcept</span> <span class='varop'>>>></span> <span class='varid'>arr3</span> <span class='conid'>DataExcept</span><span class='layout'>)</span>
<a name="line-190"></a> <span class='layout'>(</span><span class='varid'>processData</span> <span class='varop'>>>></span> <span class='varid'>arr2</span> <span class='conid'>Data</span><span class='layout'>)</span>
<a name="line-191"></a> <span class='keyword'>where</span>
<a name="line-192"></a> <span class='varid'>processDataExcept</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='layout'>(</span><span class='conid'>Datatype</span><span class='layout'>,</span> <span class='layout'>(</span><span class='conid'>ParamList</span><span class='layout'>,</span> <span class='conid'>Pattern</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-193"></a> <span class='varid'>processDataExcept</span> <span class='keyglyph'>=</span> <span class='varid'>getDatatype</span> <span class='varop'>&&&</span> <span class='varid'>getParamList</span> <span class='varop'>&&&</span>
<a name="line-194"></a> <span class='layout'>(</span> <span class='varid'>getChildren</span>
<a name="line-195"></a> <span class='varop'>>>></span>
<a name="line-196"></a> <span class='varid'>isRngExcept</span>
<a name="line-197"></a> <span class='varop'>>>></span>
<a name="line-198"></a> <span class='varid'>getChildren</span>
<a name="line-199"></a> <span class='varop'>>>></span>
<a name="line-200"></a> <span class='varid'>createPatternFromXml</span> <span class='varid'>env</span>
<a name="line-201"></a> <span class='layout'>)</span>
<a name="line-202"></a> <span class='varid'>processData</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='layout'>(</span><span class='conid'>Datatype</span><span class='layout'>,</span> <span class='conid'>ParamList</span><span class='layout'>)</span>
<a name="line-203"></a> <span class='varid'>processData</span> <span class='keyglyph'>=</span> <span class='varid'>getDatatype</span> <span class='varop'>&&&</span> <span class='varid'>getParamList</span>
<a name="line-204"></a> <span class='varid'>getParamList</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>ParamList</span>
<a name="line-205"></a> <span class='varid'>getParamList</span> <span class='keyglyph'>=</span> <span class='varid'>listA</span> <span class='varop'>$</span> <span class='varid'>getChildren</span>
<a name="line-206"></a> <span class='varop'>>>></span>
<a name="line-207"></a> <span class='varid'>isRngParam</span>
<a name="line-208"></a> <span class='varop'>>>></span>
<a name="line-209"></a> <span class='layout'>(</span><span class='varid'>getRngAttrName</span> <span class='varop'>&&&</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>getText</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-210"></a>
<a name="line-211"></a>
<a name="line-212"></a><a name="mkRelaxValue"></a><span class='comment'>-- | Transforms a value-element.</span>
<a name="line-213"></a><span class='definition'>mkRelaxValue</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-214"></a><span class='definition'>mkRelaxValue</span> <span class='keyglyph'>=</span> <span class='varid'>getDatatype</span> <span class='varop'>&&&</span> <span class='varid'>getValue</span> <span class='varop'>&&&</span> <span class='varid'>getContext</span>
<a name="line-215"></a> <span class='varop'>>>></span>
<a name="line-216"></a> <span class='varid'>arr3</span> <span class='conid'>Value</span>
<a name="line-217"></a> <span class='keyword'>where</span>
<a name="line-218"></a> <span class='varid'>getContext</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Context</span>
<a name="line-219"></a> <span class='varid'>getContext</span> <span class='keyglyph'>=</span> <span class='varid'>getAttrValue</span> <span class='varid'>contextBaseAttr</span> <span class='varop'>&&&</span> <span class='varid'>getMapping</span>
<a name="line-220"></a> <span class='varid'>getMapping</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='keyglyph'>[</span><span class='layout'>(</span><span class='conid'>Prefix</span><span class='layout'>,</span> <span class='conid'>Uri</span><span class='layout'>)</span><span class='keyglyph'>]</span>
<a name="line-221"></a> <span class='varid'>getMapping</span> <span class='keyglyph'>=</span> <span class='varid'>listA</span> <span class='varop'>$</span> <span class='varid'>getAttrl</span> <span class='varop'>>>></span>
<a name="line-222"></a> <span class='layout'>(</span> <span class='layout'>(</span><span class='varid'>getName</span> <span class='varop'>>>></span> <span class='varid'>isA</span> <span class='layout'>(</span><span class='varid'>contextAttributes</span> <span class='varop'>`isPrefixOf`</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-223"></a> <span class='varop'>`guards`</span>
<a name="line-224"></a> <span class='layout'>(</span> <span class='layout'>(</span><span class='varid'>getName</span> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='varid'>drop</span> <span class='varop'>$</span> <span class='varid'>length</span> <span class='varid'>contextAttributes</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-225"></a> <span class='varop'>&&&</span>
<a name="line-226"></a> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>getText</span><span class='layout'>)</span>
<a name="line-227"></a> <span class='layout'>)</span>
<a name="line-228"></a> <span class='layout'>)</span>
<a name="line-229"></a> <span class='varid'>getValue</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>String</span>
<a name="line-230"></a> <span class='varid'>getValue</span> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>getText</span><span class='layout'>)</span> <span class='varop'>`orElse`</span> <span class='layout'>(</span><span class='varid'>constA</span> <span class='str'>""</span><span class='layout'>)</span>
<a name="line-231"></a>
<a name="line-232"></a>
<a name="line-233"></a><a name="getDatatype"></a><span class='definition'>getDatatype</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Datatype</span>
<a name="line-234"></a><span class='definition'>getDatatype</span> <span class='keyglyph'>=</span> <span class='varid'>getRngAttrDatatypeLibrary</span>
<a name="line-235"></a> <span class='varop'>&&&</span>
<a name="line-236"></a> <span class='varid'>getRngAttrType</span>
<a name="line-237"></a>
<a name="line-238"></a>
<a name="line-239"></a><span class='comment'>-- | Transforms a attribute-element.</span>
<a name="line-240"></a><span class='comment'>-- The first child is a 'NameClass', the second (the last) one a pattern.</span>
<a name="line-241"></a>
<a name="line-242"></a><a name="mkRelaxAttribute"></a><span class='definition'>mkRelaxAttribute</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-243"></a><span class='definition'>mkRelaxAttribute</span> <span class='varid'>env</span>
<a name="line-244"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>firstChild</span> <span class='varop'>>>></span> <span class='varid'>createNameClass</span> <span class='layout'>)</span>
<a name="line-245"></a> <span class='varop'>&&&</span>
<a name="line-246"></a> <span class='layout'>(</span> <span class='varid'>lastChild</span> <span class='varop'>>>></span> <span class='varid'>createPatternFromXml</span> <span class='varid'>env</span> <span class='layout'>)</span>
<a name="line-247"></a> <span class='layout'>)</span>
<a name="line-248"></a> <span class='varop'>>>></span>
<a name="line-249"></a> <span class='varid'>arr2</span> <span class='conid'>Attribute</span>
<a name="line-250"></a>
<a name="line-251"></a><a name="mkRelaxElement"></a><span class='comment'>-- | Transforms a element-element.</span>
<a name="line-252"></a><span class='comment'>-- The first child is a 'NameClass', the second (the last) one a pattern.</span>
<a name="line-253"></a><span class='definition'>mkRelaxElement</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-254"></a><span class='definition'>mkRelaxElement</span> <span class='varid'>env</span>
<a name="line-255"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>firstChild</span> <span class='varop'>>>></span> <span class='varid'>createNameClass</span> <span class='layout'>)</span>
<a name="line-256"></a> <span class='varop'>&&&</span>
<a name="line-257"></a> <span class='layout'>(</span> <span class='varid'>lastChild</span> <span class='varop'>>>></span> <span class='varid'>createPatternFromXml</span> <span class='varid'>env</span> <span class='layout'>)</span>
<a name="line-258"></a> <span class='layout'>)</span>
<a name="line-259"></a> <span class='varop'>>>></span>
<a name="line-260"></a> <span class='varid'>arr2</span> <span class='conid'>Element</span>
<a name="line-261"></a>
<a name="line-262"></a>
<a name="line-263"></a><a name="createNameClass"></a><span class='comment'>-- | Creates a 'NameClass' from an \"anyName\"-, \"nsName\"- or \"name\"-Pattern, </span>
<a name="line-264"></a><span class='definition'>createNameClass</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>NameClass</span>
<a name="line-265"></a><span class='definition'>createNameClass</span>
<a name="line-266"></a> <span class='keyglyph'>=</span> <span class='varid'>choiceA</span>
<a name="line-267"></a> <span class='keyglyph'>[</span> <span class='varid'>isRngAnyName</span> <span class='conop'>:-></span> <span class='varid'>processAnyName</span>
<a name="line-268"></a> <span class='layout'>,</span> <span class='varid'>isRngNsName</span> <span class='conop'>:-></span> <span class='varid'>processNsName</span>
<a name="line-269"></a> <span class='layout'>,</span> <span class='varid'>isRngName</span> <span class='conop'>:-></span> <span class='varid'>processName</span>
<a name="line-270"></a> <span class='layout'>,</span> <span class='varid'>isRngChoice</span> <span class='conop'>:-></span> <span class='varid'>processChoice</span>
<a name="line-271"></a> <span class='layout'>,</span> <span class='varid'>this</span> <span class='conop'>:-></span> <span class='varid'>mkNameClassError</span>
<a name="line-272"></a> <span class='keyglyph'>]</span>
<a name="line-273"></a> <span class='keyword'>where</span>
<a name="line-274"></a> <span class='varid'>processAnyName</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>NameClass</span>
<a name="line-275"></a> <span class='varid'>processAnyName</span>
<a name="line-276"></a> <span class='keyglyph'>=</span> <span class='varid'>ifA</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isRngExcept</span><span class='layout'>)</span>
<a name="line-277"></a> <span class='layout'>(</span> <span class='varid'>getChildren</span>
<a name="line-278"></a> <span class='varop'>>>></span> <span class='varid'>getChildren</span>
<a name="line-279"></a> <span class='varop'>>>></span> <span class='varid'>createNameClass</span>
<a name="line-280"></a> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='conid'>AnyNameExcept</span>
<a name="line-281"></a> <span class='layout'>)</span>
<a name="line-282"></a> <span class='layout'>(</span> <span class='varid'>constA</span> <span class='conid'>AnyName</span> <span class='layout'>)</span>
<a name="line-283"></a>
<a name="line-284"></a> <span class='varid'>processNsName</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>NameClass</span>
<a name="line-285"></a> <span class='varid'>processNsName</span>
<a name="line-286"></a> <span class='keyglyph'>=</span> <span class='varid'>ifA</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>isRngExcept</span><span class='layout'>)</span>
<a name="line-287"></a> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>getRngAttrNs</span>
<a name="line-288"></a> <span class='varop'>&&&</span>
<a name="line-289"></a> <span class='layout'>(</span> <span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>createNameClass</span> <span class='layout'>)</span>
<a name="line-290"></a> <span class='layout'>)</span>
<a name="line-291"></a> <span class='varop'>>>></span>
<a name="line-292"></a> <span class='varid'>arr2</span> <span class='conid'>NsNameExcept</span>
<a name="line-293"></a> <span class='layout'>)</span>
<a name="line-294"></a> <span class='layout'>(</span> <span class='varid'>getRngAttrNs</span> <span class='varop'>>>></span> <span class='varid'>arr</span> <span class='conid'>NsName</span> <span class='layout'>)</span>
<a name="line-295"></a>
<a name="line-296"></a> <span class='varid'>processName</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>NameClass</span>
<a name="line-297"></a> <span class='varid'>processName</span>
<a name="line-298"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span><span class='varid'>getRngAttrNs</span> <span class='varop'>&&&</span> <span class='layout'>(</span><span class='varid'>getChildren</span> <span class='varop'>>>></span> <span class='varid'>getText</span><span class='layout'>)</span><span class='layout'>)</span> <span class='varop'>>>></span> <span class='varid'>arr2</span> <span class='conid'>Name</span>
<a name="line-299"></a>
<a name="line-300"></a> <span class='varid'>processChoice</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>NameClass</span>
<a name="line-301"></a> <span class='varid'>processChoice</span>
<a name="line-302"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='layout'>(</span> <span class='varid'>firstChild</span> <span class='varop'>>>></span> <span class='varid'>createNameClass</span> <span class='layout'>)</span>
<a name="line-303"></a> <span class='varop'>&&&</span>
<a name="line-304"></a> <span class='layout'>(</span> <span class='varid'>lastChild</span> <span class='varop'>>>></span> <span class='varid'>createNameClass</span> <span class='layout'>)</span>
<a name="line-305"></a> <span class='layout'>)</span>
<a name="line-306"></a> <span class='varop'>>>></span>
<a name="line-307"></a> <span class='varid'>arr2</span> <span class='conid'>NameClassChoice</span>
<a name="line-308"></a>
<a name="line-309"></a><a name="mkNameClassError"></a><span class='definition'>mkNameClassError</span> <span class='keyglyph'>::</span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>NameClass</span>
<a name="line-310"></a><span class='definition'>mkNameClassError</span>
<a name="line-311"></a> <span class='keyglyph'>=</span> <span class='varid'>choiceA</span> <span class='keyglyph'>[</span> <span class='varid'>isRngRelaxError</span>
<a name="line-312"></a> <span class='conop'>:-></span> <span class='layout'>(</span> <span class='varid'>getRngAttrDescr</span>
<a name="line-313"></a> <span class='varop'>>>></span>
<a name="line-314"></a> <span class='varid'>arr</span> <span class='conid'>NCError</span>
<a name="line-315"></a> <span class='layout'>)</span>
<a name="line-316"></a> <span class='layout'>,</span> <span class='varid'>isElem</span> <span class='conop'>:-></span> <span class='layout'>(</span> <span class='varid'>getName</span>
<a name="line-317"></a> <span class='varop'>>>></span>
<a name="line-318"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='conid'>NCError</span> <span class='layout'>(</span><span class='str'>"Can't create name class from element "</span> <span class='varop'>++</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-319"></a> <span class='layout'>)</span>
<a name="line-320"></a> <span class='layout'>,</span> <span class='varid'>isAttr</span> <span class='conop'>:-></span> <span class='layout'>(</span> <span class='varid'>getName</span>
<a name="line-321"></a> <span class='varop'>>>></span>
<a name="line-322"></a> <span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>n</span> <span class='keyglyph'>-></span> <span class='conid'>NCError</span> <span class='layout'>(</span><span class='str'>"Can't create name class from attribute: "</span> <span class='varop'>++</span> <span class='varid'>n</span><span class='layout'>)</span><span class='layout'>)</span>
<a name="line-323"></a> <span class='layout'>)</span>
<a name="line-324"></a> <span class='layout'>,</span> <span class='varid'>isError</span> <span class='conop'>:-></span> <span class='layout'>(</span> <span class='varid'>getErrorMsg</span>
<a name="line-325"></a> <span class='varop'>>>></span>
<a name="line-326"></a> <span class='varid'>arr</span> <span class='conid'>NCError</span>
<a name="line-327"></a> <span class='layout'>)</span>
<a name="line-328"></a> <span class='layout'>,</span> <span class='varid'>this</span> <span class='conop'>:-></span> <span class='layout'>(</span> <span class='varid'>arr</span> <span class='layout'>(</span><span class='keyglyph'>\</span><span class='varid'>e</span> <span class='keyglyph'>-></span> <span class='conid'>NCError</span> <span class='varop'>$</span> <span class='str'>"Can't create name class from "</span> <span class='varop'>++</span> <span class='varid'>show</span> <span class='varid'>e</span><span class='layout'>)</span> <span class='layout'>)</span>
<a name="line-329"></a> <span class='keyglyph'>]</span>
<a name="line-330"></a>
<a name="line-331"></a>
<a name="line-332"></a><a name="getOneChildPattern"></a><span class='definition'>getOneChildPattern</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='conid'>Pattern</span>
<a name="line-333"></a><span class='definition'>getOneChildPattern</span> <span class='varid'>env</span>
<a name="line-334"></a> <span class='keyglyph'>=</span> <span class='varid'>firstChild</span> <span class='varop'>>>></span> <span class='varid'>createPatternFromXml</span> <span class='varid'>env</span>
<a name="line-335"></a>
<a name="line-336"></a>
<a name="line-337"></a><a name="getTwoChildrenPattern"></a><span class='definition'>getTwoChildrenPattern</span> <span class='keyglyph'>::</span> <span class='conid'>Env</span> <span class='keyglyph'>-></span> <span class='conid'>LA</span> <span class='conid'>XmlTree</span> <span class='layout'>(</span><span class='conid'>Pattern</span><span class='layout'>,</span> <span class='conid'>Pattern</span><span class='layout'>)</span>
<a name="line-338"></a><span class='definition'>getTwoChildrenPattern</span> <span class='varid'>env</span>
<a name="line-339"></a> <span class='keyglyph'>=</span> <span class='layout'>(</span> <span class='varid'>getOneChildPattern</span> <span class='varid'>env</span> <span class='layout'>)</span>
<a name="line-340"></a> <span class='varop'>&&&</span>
<a name="line-341"></a> <span class='layout'>(</span> <span class='varid'>lastChild</span> <span class='varop'>>>></span> <span class='varid'>createPatternFromXml</span> <span class='varid'>env</span> <span class='layout'>)</span>
<a name="line-342"></a>
<a name="line-343"></a><span class='comment'>-- | Simple access arrows</span>
<a name="line-344"></a>
<a name="line-345"></a><a name="firstChild"></a><span class='definition'>firstChild</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>ArrowTree</span> <span class='varid'>a</span><span class='layout'>,</span> <span class='conid'>Tree</span> <span class='varid'>t</span><span class='layout'>)</span> <span class='keyglyph'>=></span> <span class='varid'>a</span> <span class='layout'>(</span><span class='varid'>t</span> <span class='varid'>b</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>t</span> <span class='varid'>b</span><span class='layout'>)</span>
<a name="line-346"></a><span class='definition'>firstChild</span> <span class='keyglyph'>=</span> <span class='varid'>single</span> <span class='varid'>getChildren</span>
<a name="line-347"></a>
<a name="line-348"></a><a name="lastChild"></a><span class='definition'>lastChild</span> <span class='keyglyph'>::</span> <span class='layout'>(</span><span class='conid'>ArrowTree</span> <span class='varid'>a</span><span class='layout'>,</span> <span class='conid'>Tree</span> <span class='varid'>t</span><span class='layout'>)</span> <span class='keyglyph'>=></span> <span class='varid'>a</span> <span class='layout'>(</span><span class='varid'>t</span> <span class='varid'>b</span><span class='layout'>)</span> <span class='layout'>(</span><span class='varid'>t</span> <span class='varid'>b</span><span class='layout'>)</span>
<a name="line-349"></a><span class='definition'>lastChild</span> <span class='keyglyph'>=</span> <span class='varid'>getChildren</span> <span class='varop'>>>.</span> <span class='layout'>(</span><span class='varid'>take</span> <span class='num'>1</span> <span class='varop'>.</span> <span class='varid'>reverse</span><span class='layout'>)</span>
</pre></body>
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