Re: Retrieving sequence of unique strings from another

I have a sequence of strings, e.g., ('abc', 'def', 'def', 'ghi'), and I want to create a new sequence that will have only the unique strings in it. The XSL 2.0 function distinct-values is not what I want because:

<xsl:variable name="list" as="xsd:string*" select="('abc', 'def', 'def', 'ghi')" />
<xsl:variable name="uniq" as="xsd:string*" select="distinct-values($list)" />

will result in a sequence of ('abc', 'def', 'ghi') which is not what I'm looking for. What I am looking for is the sequence ('abc', 'ghi'). Unix people will recognize that distinct-values() returns the result of the uniq command without any options. While what I'm looking for is the result of the uniq command with the -u option.

Can anyone suggest how I might use one or more XSL 2.0 functions to return only the unique strings.

T:\ftemp>xslt2 andy.xsl andy.xsl
abc ghi
T:\ftemp>type andy.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="list" as="xsd:string*"
                select="('abc', 'def', 'def', 'ghi')"/>
  <xsl:variable name="uniq" as="xsd:string*"
                select="for $each in $list return
                        if( count($list[.=$each])=1 ) then $each else ()"/>
  <xsl:value-of select="$uniq"/>
</xsl:template>

</xsl:stylesheet>
T:\ftemp>

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