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RE: in search for more elegant XPaths

Subject: RE: in search for more elegant XPaths
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Wed, 22 Apr 2009 14:47:38 +0100
RE:  in search for more elegant XPaths
> *[string-length(normalize-space(.))&gt;0]

> No need to work out the length (which can be surprisingly 
> costly for general unicode strings) you can just do
> 
>  *[normalize-space(.)]
> 
> as the predicate is true if teh string is non empty. 
> (Although I have a feeling saxon for example does that 
> rewrite for you anyway, so it may make no difference.)

Indeed. Saxon will neither construct a string with the whitespace removed,
nor count the characters that remain after removing them: with either
expression it simply scans the string (or rather, its UTF16 representation)
and returns false as soon as it hits a non-whitespace codepoint.

Michael Kay
http://www.saxonica.com/

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