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>From Dr. Kay's reply, it sounds like this is being looked into for
XSLT 2.1; I hope something can be worked out eventually as I for one would definitely use such a feature! We tried something along those sort of lines - it got horribly messy and we abandoned it. We came up with xsl:fork http://www.w3.org/TR/xslt-21/#fork-instruction where basically you write your logic as two passes over the data, and then say to the processor that you want both passes to operate in parallel. It allows the two passes to do completely different navigation of the input (e.g. they don't have to select exactly the same nodes), which is good for the general use case, but not ideal where you want them both to do exactly the same navigation. The other interesting question is whether xsl:fork really needs to be written by the user, or whether it's the kind of thing that one should leave to the optimizer. Michael Kay Saxonica
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