When we use an index in XSLT is built an hashtable with keyvalue and nodes.
But how are defined the nodes in this table (path , oID...)?
A system _might_ build a hashtable or it might just convert key() into
the equivalent xpath and search the entire document each time (which is
effectively how it is defined) Any data structures the system uses to
optimise this are system dependent and invisible to the stylesheet.
David
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