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copied!<p><strong>Here is the requested generic solution to the problem</strong>:</p> <pre><code><xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:my="my:my" exclude-result-prefixes="my xs"> <xsl:import href="C:/temp/delete/GlobalTypeMappings.xsl"/> <xsl:output omit-xml-declaration="yes" indent="yes"/> <xsl:template match="order_system_a"> <order_system_b> <xsl:apply-templates select="@*"/> </order_system_b> </xsl:template> <xsl:template match="order_system_a/@type"> <xsl:attribute name="type" select= "my:convertType('order_system_a', 'order_system_b', .)"/> </xsl:template> </xsl:stylesheet> </code></pre> <h2>C:/temp/delete/GlobalTypeMappings.xsl:</h2> <pre><code><xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:my="my:my" exclude-result-prefixes="my xs"> <xsl:key name="kMapFromLocal" match="map" use="concat(@system, '+', @local-type)"/> <xsl:key name="kMapFromValue" match="map" use="concat(@system, '+', @value)"/> <my:TypeMappings> <map system="order_system_a" local-type="1" value="type1"/> <map system="order_system_a" local-type="2" value="type2"/> <map system="order_system_a" local-type="3" value="type3"/> <map system="order_system_a" local-type="4" value="type4"/> <map system="order_system_b" local-type="X" value="type1"/> <map system="order_system_b" local-type="Y" value="type2"/> <map system="order_system_b" local-type="Z" value="type3"/> <map system="order_system_b" local-type="T" value="type4"/>  </my:TypeMappings> <xsl:function name="my:convertType" as="xs:string?"> <xsl:param name="pfromSystem" as="xs:string"/> <xsl:param name="ptoSystem" as="xs:string"/> <xsl:param name="pfromValue" as="xs:string"/> <xsl:variable name="vthisDoc" select="document('')"/> <xsl:sequence select= "key('kMapFromValue', concat($ptoSystem, '+', key('kMapFromLocal', concat($pfromSystem, '+', $pfromValue), $vthisDoc ) /@value ), $vthisDoc ) /@local-type "/> </xsl:function> </xsl:stylesheet> </code></pre> <p><strong>When the above transformation is applied to the provided XML document</strong>:</p> <pre><code><order_system_a type="1" /> </code></pre> <p><strong>the wanted, correct result is produced</strong>:</p> <pre><code><order_system_b type="X"/> </code></pre>

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