"DOM node" isn't really xpath terminology so the error message could be
better, but the point is that the | operator is node set union
so the things on either side of it have to be node sets.
'Multiuser' | 'Application'
they are strings not node sets.
The boolean or operator is "or" not "|" although you can't use that with
strings either (well, you can but any non empty string is true).
I guess you want
inscope/@key[.='Multiuser' or .='Application']
David
--
http://www.dcarlisle.demon.co.uk/matthew
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