[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Wath is the opposite of the union operator?
> 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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