>> 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.

ueseful optimisations. Could it also optimise 'teh'='the' to true() at the
same time? It would save a lot of grief.


David

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