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convert-courses-via-maps.xsl
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convert-courses-via-maps.xsl
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<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="3.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:map="http://www.w3.org/2005/xpath-functions/map"
xmlns:array="http://www.w3.org/2005/xpath-functions/array"
exclude-result-prefixes="xs map array">
<xsl:param name="input"/>
<xsl:output method="json"/>
<xsl:template name="xsl:initial-template">
<xsl:variable name="input-as-array" select="json-doc($input)" as="array(*)"/>
<xsl:variable name="items" as="map(xs:string, item())*" select="
for
$course in $input-as-array?*?courses?*,
$student in $course?students?*
return
map { 'student': $student, 'course': $course?course }"/>
<xsl:variable name="groups" as="map(xs:string, item())*">
<xsl:for-each-group select="$items" group-by="?student?email">
<xsl:sort select="?student?last"/>
<xsl:sort select="?student?first"/>
<xsl:sequence select="
map
{
'email': current-grouping-key(),
'courses': array { current-group()?course }
}"/>
</xsl:for-each-group>
</xsl:variable>
<xsl:sequence select="array { $groups }"/>
</xsl:template>
</xsl:stylesheet>