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I think you want
$ saxon9 rm.xml rm.xsl [Sally,Betsy] [Joan,Linda] [Sue,Carol] [Francine,Doris] [Sally,Carol] [Joan,Linda] [Betsy,Sue] [Francine,Doris] where rm.xml is your posted file and the xsl is <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:f="data:,f"> <xsl:output method="text"/> <xsl:template match="RoommateFinder"> <xsl:sequence select="string-join(f:rm(Freshmen/Name),' ')"/> </xsl:template> <xsl:key name="p" match="OkayToPairWith/Name" use="../../Name"/> <xsl:function name="f:rm">
<xsl:param name="l"/>
<xsl:sequence select="
if(empty($l)) then ('')
else if (empty(key('p',$l[1],root($l[1]))[.=$l])) then ()
else
for $p in key('p',$l[1],root($l[1]))[.=$l]
return
for $s in f:rm($l[position()!=1][not(.=$p)])
return
concat('[',$l[1],',',$p,'] ',$s)"/>
</xsl:function></xsl:stylesheet> If it's time complexity is too large, just blame Michael's optimiser:-) David
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