XSLT to transform ASFA Thesaurus to DSpace controlled vocabulary

asfa.xslt

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output omit-xml-declaration="yes" indent="yes"/>
    <xsl:strip-space elements="*"/>

    <xsl:key name="kConcByCode" match="CONCEPT" use="DESCRIPTOR"/>
    <xsl:key name="useFor" match="CONCEPT" use="NON-DESCRIPTOR"/>

    <xsl:template match="/">
        <node id="ASFA" label="ASFA Thesaurus">
            <isComposedBy>
                <xsl:apply-templates select="/*/CONCEPT[not(BT)]"/>
            </isComposedBy>
        </node>
    </xsl:template>

    <xsl:template match="CONCEPT">
        <node id="{DESCRIPTOR}" label="{DESCRIPTOR}">
            <xsl:if test="key('kConcByCode', NT)">
                <isComposedBy>
                    <xsl:apply-templates select="key('kConcByCode', NT)"/>
                </isComposedBy>
            </xsl:if>
        </node>
    </xsl:template>
    <xsl:template match="CONCEPT[NON-DESCRIPTOR]">
            <xsl:if test="key('useFor', NON-DESCRIPTOR)">
                <node id="{NON-DESCRIPTOR}" label="{NON-DESCRIPTOR}, USE: {USE}"/>
            </xsl:if>
    </xsl:template>
</xsl:stylesheet>