XML/XSLT stylesheet/idref

Here is a test of the idref()

File: Data.xml
<?xml version="1.0"?>
<parts-list>
  <component component-id="C28392-33-TT">
    <name>Name 0</name>
    <partref refid="1"/>
    <partref refid="2"/>
    <partref refid="3"/>
    <partref refid="4"/>
    <description>
        <partref refid="3"/>.
    </description>
  </component>
  <component component-id="5">
    <name>name 1</name>
    <partref refid="6"/>
    <partref refid="7"/>
    <description>
      <partref refid="6"/> and a 
      <partref refid="7"/>.
    </description>
  </component>
  <part part-id="6" supplier="4839">
    <name>Pitter</name>
  </part>
  <part part-id="7" supplier="2983">
    <name>Patter</name>
  </part>
  <part part-id="2" supplier="5910">
    <name>Spanner</name>
  </part>
  <supplier country="Great Britain" vendor-id="4839">
    <name>A Inc.</name>
  </supplier>
  <supplier country="Germany" vendor-id="2983">
    <name>B Inc.</name>
  </supplier>
  <supplier country="Great Britain" vendor-id="5910">
    <name>C Inc.</name>
  </supplier>
</parts-list>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="2.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="text"/>
  <xsl:template match="/">
    <xsl:text>&#xA;Here is a test of the idref() </xsl:text>
    <xsl:text>function:&#xA;</xsl:text>
    <xsl:for-each select="/parts-list/part">
      <xsl:text>&#xA;  </xsl:text>
      <xsl:value-of select="name"/>
      <xsl:text> (part #</xsl:text>
      <xsl:value-of select="@part-id"/>
      <xsl:text>) is used in these products:&#xA;    </xsl:text>
      <xsl:value-of select="idref(@part-id)/../../name" 
        separator="&#xA;    "/> 
      <xsl:text>&#xA;</xsl:text>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>
Output:

Here is a test of the idref() function:
  Pitter (part #6) is used in these products:
    
  Patter (part #7) is used in these products:
    
  Spanner (part #2) is used in these products: