Re: Two file problem.

<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0"><xsl:output method="xml" indent="yes"/>
<xsl:template match="/">
<xsl:for-each select="document('dp-f1.xml')/fa/a|
document('dp-f2.xml')/fb/a[not(@name=document('dp-f1.xml')/fa/a/@name)]">
<xsl:sort select="@name"/><a name="{@name}">
<xsl:value-of select="sum(document('dp-f1.xml')/fa/a[@name=current()/@name]|
document('dp-f2.xml')/fb/a[@name=current()/@name])"/>
</a>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>

saxon dp-f.xsl dp-f.xsl 
<?xml version="1.0" encoding="utf-8" ?>
<a name="a1">4</a>
<a name="a2">5</a>
<a name="a3">3</a>
<a name="a4">2</a>
<a name="new">1</a>


David 


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list