*[string-length(normalize-space(.))>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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