Re: key with restricting the scope of use attribute

something like


<xsl:key name="MyKey1" match="b/foo"
         use="concat(generate-id(..),':',*/x,':',*/y)"/>

or if b isn't always a direct parent, something like


<xsl:key name="MyKey1" match="foo"
         use="concat(generate-id(ancestor::b[1]),':',*/x,':',*/y)"/>

then 

<xsl:template match="b">
  key('MyKey1',concat(generate-id(),':','1:1'))">
will give you all the foo children of b which have x and y grandchildren 
with values 1 and 1.

David


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