RE: Performance versus legibility

> 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? 

In the case of Saxon, yes. But note that not(x=y) and x!=y are not
equivalent.

(And note not that they are equivalent!)

Mike Kay


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