Subject: RE: Wath is the opposite of the union operator?
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Thu, 22 Sep 2005 12:49:38 +0100
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> Subject: Wath is the opposite of the union operator?
>
> Or puting it in another way, how do i select a group of nodes selected
> by some xpath expression EXCEPT the ones that are selected by another
> xpath expression?
The operation you are referring to is usually called "set difference". In
XPath 2.0, the operator is spelt "except". There is also a set intersection
operator spelt "intersect". There's no equivalent to these in XSLT 1.0,
though some processors support the EXSLT set:difference() and
set:intersection() functions. You can expensively code
A except B =>
A[count(.|B) != count(B)]
A intersect B =>
A[count(.|B) = count(B)]
Michael Kay
http://www.saxonica.com/
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Michael Kay - 22 Sep 2005 11:49:59 -0000 <=
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