Here's my counter-proposal: A User Data Element, say exslt:performance-hints: <exslt:performance-hints> <only-load-once document-uri="xyz://a.b.c/a/doc" /> <only-load-once collection-uri="xyz://a.b.c/b/collection" /> </exslt:performance-hints> Semantics: only-load-once gives an optimization hint to the processor that a document will not be accessed again outside of the xslt element that causes it to be loaded. Since it is a performance hint, the processor is free to ignore it, if it is doesn't believe the coder :-) More importantly, since it's a User Data Element, the stylesheet remains portable. If the processor recognizes the UDE, then it proceeds as follows: When loading such a URI, it discards the document as soon as it is safe to do so (it only has a local scope - this may need tying down a bit more). If a subsequent attempt is made to load the same document, then an non-recoverable dynamic error is raised (the user has violated the semantics of exslt:performance-hints). -- Colin Adams Preston Lancashire
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