A good one, David!
I think this type of sort was first used by David McNally a few years
ago. I call it "distance sorting".
Actually, I was thinking that this approach was feasible last night,
but was too tired to try to follow it.
Cheers,
Dimitre Novatchev.
Or rather you could use keys here, but in this case, i think you just want
to sort don't you?
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0" >
<xsl:output method="xml" indent="yes"/>
<xsl:template match="root">
<root>
<xsl:for-each select="item">
<xsl:sort data-type="number"
select="count(preceding-sibling::item[(_at_)type=current()/@type])"/>
<xsl:copy-of select="."/>
</xsl:for-each>
</root>
</xsl:template>
</xsl:stylesheet>
produces
$ saxon item.xml item.xsl
<?xml version="1.0" encoding="utf-8"?>
<root>
<item type="A" subType="1"/>
<item type="B" subType="2"/>
<item type="D" subType="1"/>
<item type="E" subType="2"/>
<item type="A" subType="2"/>
<item type="B" subType="3"/>
<item type="D" subType="2"/>
<item type="E" subType="4"/>
<item type="A" subType="4"/>
<item type="D" subType="3"/>
<item type="D" subType="4"/>
</root>
which appears to be what you wanted.
David
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