RE: Performance versus legibility

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RE: Performance versus legibility

Subject: RE: Performance versus legibility
From: Kay Michael <Michael.Kay@xxxxxxx>
Date: Fri, 24 Nov 2000 15:07:34 -0000

> not(string(.))	string-length(.)=0
> not(x)		count(x)=0
> not(x=y)	x!=y

I just realised that the second pair of expressions aren't equivalent
either:

count(x)=0 fails if x is not a node-set, not(x) doesn't.

Optimisers have to be careful with these things!


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Current Thread
Performance versus legibility Richard Birkby - Fri, 24 Nov 2000 14:16:32 -0000 David Carlisle - Fri, 24 Nov 2000 14:45:00 GMT stefano debenedetti - Fri, 24 Nov 2000 16:43:40 +0100 <Possible follow-ups> Kay Michael - Fri, 24 Nov 2000 14:59:02 -0000 Kay Michael - Fri, 24 Nov 2000 15:07:34 -0000 <= Dimitre Novatchev - Fri, 24 Nov 2000 07:26:57 -0800 (PST) Dimitre Novatchev - Sat, 25 Nov 2000 00:30:30 -0800 (PST)

Current Thread

Performance versus legibility
- Richard Birkby - Fri, 24 Nov 2000 14:16:32 -0000
  - David Carlisle - Fri, 24 Nov 2000 14:45:00 GMT
    - stefano debenedetti - Fri, 24 Nov 2000 16:43:40 +0100
  - <Possible follow-ups>
  - Kay Michael - Fri, 24 Nov 2000 14:59:02 -0000
  - Kay Michael - Fri, 24 Nov 2000 15:07:34 -0000 <=
  - Dimitre Novatchev - Fri, 24 Nov 2000 07:26:57 -0800 (PST)
  - Dimitre Novatchev - Sat, 25 Nov 2000 00:30:30 -0800 (PST)

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