Hi Kurt,
Good article. I know the examples are contrived to make your point, but a great feature of XPath 2.0 that you didn't mention is the slash operator.
This means you can rewrite:
for $para in //p return
if(string-length($para)>800) then string-length($para) else ( )
to:
for $para in //p return
$para[string-length()>800]/string-length()
which is the same as:
//p[string-length()>800]/string-length()
...and because we're only interested in the length of the
and not the para itself, that can be reduced to:
//p/string-length()[. > 800]
The slash operator applies the function on its right to each node in the sequence on its left - so //p creates a sequence of all the
elements in the document, then the string-length() function is applied to each item in that sequence using the slash operator resulting in a sequence of integers , and finally that sequence is filtered using the predicate to contain only those values greater than 800.
cheers
andrew
http://andrewjwelch.com
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