Of course if I had written it like this with the variable local
instead of global I wouldn't be asking the question.
So I guess the question is whether the global version entails an extra
pass over the data or any other performance penalty.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0"
exclude-result-prefixes="xs">
<xsl:output method="text"/>
<xsl:key name="elems" match="*" use="name()"/>
<xsl:key name="counts" match="*" use="count(key('elems',name()))"/>
<xsl:template match="/">
<xsl:variable name="all" as="xs:integer+">
<xsl:apply-templates select="*"/>
</xsl:variable>
<xsl:sequence select="sum(key('counts',max($all))/count(@*))"/>
</xsl:template>
<xsl:template match="*">
<xsl:sequence select="count(key('elems',name()))"/>
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="text()"/>
</xsl:stylesheet>
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