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Re: Performance versus legibility
- To: xsl-list at mulberrytech dot com
- Subject: Re: Performance versus legibility
- From: David Carlisle <davidc at nag dot co dot uk>
- Date: Fri, 24 Nov 2000 14:45:00 GMT
- References: <F119IOGCvqQ7SzE2NSA000039cf@hotmail.com>
- 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,
I usually find the first forms are clearer not(@id) seems to say "no id
attribute" clearer than count(@id)=0. But beware while the first two
pairs are equivalent, not(x=y) is not the same thing as x!=y and I find
it's really dangerous to use != as usually I want not ( = ).
If either x or y is a node set containing nodes with different values
then x!=y is always true.
David
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