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RE: [xsl] optimization for very large, flat documents


Subject: RE: [xsl] optimization for very large, flat documents
From: "Pawson, David" <David.Pawson@xxxxxxxxxxx>
Date: Wed, 19 Jan 2005 09:59:41 -0000

    -----Original Message-----
    From: Michael Kay

    > Why doesn't XSLT provide a way to specify that a matched
    node can be
    > processed independently of its predecessor and successor
    siblings?


    > siblings?

    I think the reason that XSLT vendors have not tried this
    approach is:

    (b) for such stylesheets, a completely different run-time
    approach is
    needed: effectively, a different XSLT processor.

    I think that in practice if you want to do serial
    transformation then a functional language is not the right
    answer: if you can only look at each piece of input data
    once, then you need the ability to remember what you have
    seen, so you need a procedural language with updatable
    memory. That's why STX was invented.

    However, I think there is scope for someone to package up
    the idea of running an XSLT transform on each "record" in a
    large file, and then recombining the results.



With the number of times this issue comes up Mike,
I'm surprised the WG haven't considered it, or some variant such as the STX
approach?
I.e. some means of XSLT-like processing for large document,
even given a strict list of restrictions.

It would appear that (most of) the constraints are known;
The use case should (or could be) readily determined;
All that's missing is the impetus to move on this.

Perhaps once the smoke has cleared from xslt 2.0?

regards DaveP






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