... In xpath2 you can have sequences of
strings and sequences of text nodes (and sequences that
contain both strings and text nodes) the rules for the two
cases (and in particular whether spaces are automatically
inserted between adjacent
items) are different on the two cases.
We've removed some of the worst "surprises" in the light of experience, but
there will still be a few pitfalls for people who fail to realise the subtle
distinction between a string and a text node. The best advice for XSLT 2.0
users is: declare your types. Although you can still declare variables and
parameters without types, debugging becomes vastly easier if you do declare
them.
Michael Kay
http://www.saxonica.com/
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