Given the following xml, I'd like to get the 0803 (last) section's set
elements + the 0802 (before last) set elements that are not already in 0803.

<application>
   <section id="0802">
    <set key="jazz" value="4" />
    <set key="pop" value="61" />
    <set key="rock" value="43" />
  </section>
  <section id="0803">
    <set key="jazz" value="2" />
    <set key="vocal" value="2" />
  </section>
</application>

In this case:

jazz
vocal
pop
rock

t:\ftemp>type raymond.xml
<application>
   <section id="0802">
    <set key="jazz" value="4" />
    <set key="pop" value="61" />
    <set key="rock" value="43" />
  </section>
  <section id="0803">
    <set key="jazz" value="2" />
    <set key="vocal" value="2" />
  </section>
</application>

t:\ftemp>type raymond.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="2.0">

<xsl:template match="/">
XSLT 2:
<xsl:value-of select="distinct-values(//@key)" separator="&#xa;"/>
XSLT 1:
<xsl:for-each select="//@key[generate-id(.)=
                             generate-id(key('keys',.)[1])]">
  <xsl:if test="position()>1" xml:space="preserve">
</xsl:if>
  <xsl:value-of select="."/>
</xsl:for-each>
</xsl:template>

</xsl:stylesheet>
t:\ftemp>xslt2 raymond.xml raymond.xsl con

XSLT 2:
jazz
pop
rock
vocal
XSLT 1:
jazz
pop
rock
vocal
t:\ftemp>

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