not(A!=B) is true just if A!=B is false which is only the
case if every
node in A is equal to every node in B. If that's what you want to test
for then the expression is put to good use, but it's rather
rare to have
a node set where all the nodes are string equal (unless it's something
like @abc where you know there is at most one node in the set).
There are of course use cases for !=. For example
if (//@xml:lang != 'en')
tests if the document contains an xml:lang attribute whose value is not
equal to "en".
But they are rather rare in practice.
Michael Kay
http://www.saxonica.com/
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