Define and use function : function « XSLT stylesheet « XML

Define and use function



File: Data.xml

<?xml version="1.0"?>
<parts>
  <part id="p10" idref="p20"/>
  <part id="p20" idref="p30 p40"/>
  <part id="p30"/>
  <part id="p40" idref="p10"/>
</parts>

File: Transform.xml

<?xml version="1.0"?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:graph="http://wrox.com/569090/graph"
  xmlns:xs="http://www.w3.org/2001/XMLSchema" version="2.0">

  <xsl:function name="graph:refers" as="xs:boolean">
    <xsl:param name="links" as="node()" />
    <xsl:param name="A" as="node()" />
    <xsl:param name="B" as="node()" />
    <xsl:variable name="direct" as="node()*">
      <xsl:apply-templates select="$links">
        <xsl:with-param name="from" select="$A" />
      </xsl:apply-templates>
    </xsl:variable>
    <xsl:sequence
      select="if (exists($direct intersect $B)) then true()
                         else if (some $C in $direct 
                                  satisfies graph:refers($links, $C, $B)) then true()
                         else false()" />
  </xsl:function>
</xsl:transform>

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