Re: Performance versus legibility

[Dimitre Novatchev <dnovatchev at yahoo dot com>]

Hi Richard,

I cannot say anything definite about which expressions are optimal,
my only remark is that the following too are completely different -- it
is an error to assume they are equivalent in case x and y are
node-sets:

not(x=y)	x!=y


Dimitre Novatchev.
------------------- Original Message ------------------
To: XSL-List at mulberrytech dot com 
Subject: Performance versus legibility 
From: "Richard Birkby" <rbirkby at hotmail dot com> 
Date: Fri, 24 Nov 2000 14:16:32 -0000 
Reply-To: xsl-list at mulberrytech dot com 

--------------------------------------------------------------------------------

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


I always use the expressions in the second column for maintainability,
but I 
guess the items in the first column are faster. Is my assumption
correct? 
Are there any other performance bottlenecks in common usage?


Richard



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