> but I don't want to incur the overhead of the key
> creation unless I actually need them.

most, if not all, xslt engines only build the key tables the first time
key() is used in a given document. Otherwise xsl:key would be
prohibitively expensive, every document generated with document() or
xx:node-set() would have to be indexed whether or not the key actually
applied to that docuemnt.

David

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