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Excellent answer, thanks!
David Carlisle wrote:
Re: [xsl] Question about pattern priority
Subject: Re: [xsl] Question about pattern priority From: David Landwehr <david.landwehr@xxxxxxxxxxxx> Date: Thu, 02 Feb 2006 11:48:47 +0100 |
Excellent answer, thanks!
David Carlisle wrote:
Does anybody know if there is a reason that the pattern '//jack' has a priority of 0.5 where the pattern just 'jack' has a priority of 0?
well if there wasn't this difference there would be no point at all (in xslt1) of allowing a pattern to start with // as changing the priorityis the only effect it has:-)
It is not that the default priority rules specifically say anything about a leading // it just isn't one of the special simple cases that gets a different default. There are any number of similar examples such as jack[true()] which also matches the same nodes as jack but with different default priority.
Some early drafts of XSLT1 had far more baroque schemes for assigning priority to specific pattern forms but I think basically they thought that if the default priority scheme was not sufficiently simple that you could keep it in your head, no one would use it and just assign priorities by hand, so by the time of the XSLT 1 rec it had evolved to the scheme that you see. Of course xslt2 is a bit mpre complicated again to cope with the extra node test forms, but it still follows the same basic structure as in 1.0.
David
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