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Old October 14th, 2005, 09:46 AM
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Default sorting based on substring-before

have this xml:
(this is really kind of data i've to handle)

want to (sub)sort this like this:
aa: 123,456
bb: 987
cc: 111,222,333

have already this:
<xsl:key name="prefix" match="EL" use="substring-before(.,'_')"/>
<xsl:for-each select="EL[count(.| key('prefix',@name)[1]) = 1]">

sort like this now:

but should be (each different substring-before value once):
Old October 14th, 2005, 09:54 AM
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A problem that involves combining duplicates is a grouping problem not (primarily) a sorting problem. Grouping is easy in XSLT 2.0 using <xsl:for-each-group>, but much harder in XSLT 1.0: see http://www.jenitennison.com/xslt/grouping for ideas.

Michael Kay
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

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