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RE: use-when attribute?

Subject: RE: use-when attribute?
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Mon, 20 Dec 2004 20:06:49 -0000
saxon explain
> All true (a through e), but how is a mere user like supposed 
> to know what is optimized and what not. 

The simple and unsatisfactory answer is that it's not easy. This has been a
problem for many years with SQL. One answer is that the system can show you
its query execution plan - I don't know how many XSLT processors do this,
but Saxon has an "explain" option (saxon:explain="yes" on any XSLT element)
which gives you some clues. The other answer is: if in doubt, measure.

Michael Kay

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