Please help how to calculate set difference between string sequences in XSLT 2.0? (not node-sets)

t:\ftemp>type andriy.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                version="2.0">

<xsl:template match="/">
  <xsl:variable name="s1" as="xsd:string*" select="'a','b','c','d','e','f'"/>
  <xsl:variable name="s2" as="xsd:string*" select="'c','d','e','f','g','h'"/>
  Difference: <xsl:value-of select="$s1[not(.=$s2)],$s2[not(.=$s1)]"/>
  Intersection: <xsl:value-of select="$s1[.=$s2]"/>
</xsl:template>

  Difference: a b g h
  Intersection: c d e f
t:\ftemp>

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