Re: Using the key function

<xsl:key name="numkey" match="//house" use="member/@ref"/>
OK, although as I say, // never means anything at the start of a match.

	

	<xsl:for-each-group select="//project"
OK but do you really want to select projects or houses?


        group-by="property[@name='number']/@val"

the group-by expression will be evaluated from the selected project node
which doesn't have a property child, so this will always evaluate to
empty so everything is in one group.

You haven't given any indication of what output you want so I don't know
if you want to group houses (by changing the select to //property/house)
in which case this group-by expression would do something more
interesting, or if you want to group projects which would be something like
 group-by="house/property[@name='number']/@val"
except that that will return multiple values for each project, which you
probably don't want.


		<xsl:sort select="@number"/>
This will do nothing on the posted example as project elements don't
have number attributes, but perhaps your real input does.

select="key('numkey',@id)
@id selects the id attribute of the current node (which is a project
node) which doesn't have any attributes in your posted input


David

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