XSLT: Transform XML into nc:ContactInformation Structure

This is a short post to show how to leverage XSLT to convert a simple and generic XML file into NIEM-conformant XML as it pertains to the nc:ContactInformation block. 

This is a very common situation where a "non-NIEM" data stream is received and needs to be converted to a conformant structure.  Take the following sample non-NIEM XML instance:

<?xml version="1.0" encoding="UTF-8" ?>     
<SomeBatchOfStuff>
   <Person>
       <Name>John Doe</Name>
       <PhoneNumber>212-111-2222</PhoneNumber>
   </Person>
   <Person>
       <Name>Sally Smith</Name>
       <PhoneNumber>212-333-4444</PhoneNumber>
   </Person>
</SomeBatchOfStuff>

If this very logical structure needed to be converted into nc:Person and nc:ContactInformatoin elements (with an nc:PersonContactInformationAssociation object to link the two together), the following XSLT could be used:

<?xml version="1.0" encoding="UTF-8" ?>     
<xsl:stylesheet  xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:ns0="SomeNonConformantDocumentNamespace" version="1.0" exclude-result-prefixes="xs">
    <xsl:output method="xml" encoding="UTF-8" indent="yes"/>
    <xsl:template match="/">
        <xsl:variable name="var1_instance_InputSchema" select="."/>
        <MyNIEMConformantDocument xmlns="MyNIEMDocumentNamespace" xmlns:i="http://niem.gov/niem/appinfo/2.0" xmlns:nc="http://niem.gov/niem/niem-core/2.0" xmlns:niem-xsd="http://niem.gov/niem/proxy/xsd/2.0" xmlns:s="http://niem.gov/niem/structures/2.0">
            <!-- Loop through the Persons and create an NIEM Conformant Person -->
            <xsl:for-each select="$var1_instance_InputSchema/SomeBatchOfStuff/Person">
                <xsl:variable name="NonConformantPerson" select="."/>
                <nc:Person>
                    <xsl:attribute name="s:id">
                        <xsl:value-of select="generate-id(.)"/>
                    </xsl:attribute>
                    <nc:PersonName>
                        <xsl:for-each select="$NonConformantPerson/Name">
                            <nc:PersonFullName>
                                <xsl:value-of select="string(.)"/>
                            </nc:PersonFullName>
                        </xsl:for-each>
                    </nc:PersonName>
                </nc:Person>
            </xsl:for-each>
            
            <!-- Loop through the phone numbers and create a NIEM Conformant Contact Information -->
            <xsl:for-each select="$var1_instance_InputSchema/SomeBatchOfStuff/Person/PhoneNumber">
                <nc:ContactInformation>
                    <xsl:attribute name="s:id">
                        <xsl:value-of select="generate-id(.)"/>
                    </xsl:attribute>
                    <nc:ContactTelephoneNumber>
                        <nc:FullTelephoneNumber>
                            <nc:TelephoneNumberFullID>
                                <xsl:value-of select="string(.)"/>
                            </nc:TelephoneNumberFullID>
                        </nc:FullTelephoneNumber>
                    </nc:ContactTelephoneNumber>
                </nc:ContactInformation>
            </xsl:for-each>
            
            <!-- Loop through the phone numbers and create a NIEM Conformant Contact Information Association -->
            <xsl:for-each select="$var1_instance_InputSchema/SomeBatchOfStuff/Person">
                <nc:PersonContactInformationAssociation>
                    <nc:PersonReference>
                    <xsl:attribute name="s:ref">
                        <xsl:value-of select="generate-id(.)"/>
                    </xsl:attribute>
                    </nc:PersonReference>
                    <nc:ContactInformationReference>
                        <xsl:attribute name="s:ref">
                            <xsl:value-of select="generate-id(./PhoneNumber)"/>
                        </xsl:attribute>
                    </nc:ContactInformationReference>
                </nc:PersonContactInformationAssociation>
            </xsl:for-each>
        </MyNIEMConformantDocument>
    </xsl:template>                    
</xsl:stylesheet>

The XSLT heavily leverages the XSLT generate-id() function in order to work its magic and result in the following NIEM-conformant XML file:

<?xml version="1.0" encoding="UTF-8" ?>   
<MyNIEMConformantDocument xmlns="MyNIEMDocumentNamespace" xmlns:i="http://niem.gov/niem/appinfo/2.0" xmlns:nc="http://niem.gov/niem/niem-core/2.0" xmlns:niem-xsd="http://niem.gov/niem/proxy/xsd/2.0" xmlns:s="http://niem.gov/niem/structures/2.0" xmlns:ns0="SomeNonConformantDocumentNamespace">
   <nc:Person s:id="d0e3">
      <nc:PersonName>
         <nc:PersonFullName>John Doe</nc:PersonFullName>
      </nc:PersonName>
   </nc:Person>
   <nc:Person s:id="d0e12">
      <nc:PersonName>
         <nc:PersonFullName>Sally Smith</nc:PersonFullName>
      </nc:PersonName>
   </nc:Person>
   <nc:ContactInformation s:id="d0e8">
      <nc:ContactTelephoneNumber>
         <nc:FullTelephoneNumber>
            <nc:TelephoneNumberFullID>212-111-2222</nc:TelephoneNumberFullID>
         </nc:FullTelephoneNumber>
      </nc:ContactTelephoneNumber>
   </nc:ContactInformation>
   <nc:ContactInformation s:id="d0e17">
      <nc:ContactTelephoneNumber>
         <nc:FullTelephoneNumber>
            <nc:TelephoneNumberFullID>212-333-4444</nc:TelephoneNumberFullID>
         </nc:FullTelephoneNumber>
      </nc:ContactTelephoneNumber>
   </nc:ContactInformation>
   <nc:PersonContactInformationAssociation>
      <nc:PersonReference s:ref="d0e3"/>
      <nc:ContactInformationReference s:ref="d0e8"/>
   </nc:PersonContactInformationAssociation>
   <nc:PersonContactInformationAssociation>
      <nc:PersonReference s:ref="d0e12"/>
      <nc:ContactInformationReference s:ref="d0e17"/>
   </nc:PersonContactInformationAssociation>
</MyNIEMConformantDocument>