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RE: Re: $nodeset=true()

Subject: RE: Re: $nodeset=true()
From: "Evan Lenz" <elenz@xxxxxxxxxxx>
Date: Wed, 2 Jan 2002 10:42:40 -0800
xsl boolean nodeset
Mike Kay wrote:
> As with $node-set='somestring" or $node-set=42 in XPath 1.0,
> $node-set=true() will return true if there is at least one node $N in
> $node-set such that $N=true().
> In other words, the XPath 1.0 "existential" meaning of "=" (A=B is true if
> some a in A is equal to some b in B) now covers all cases, removing this
> awkward exception of comparison to a boolean. This change was necessary
> because a singleton boolean is equivalent in the XPath 2.0 data model to a
> sequence of length 1 whose only item is a boolean.

It's probably also worth noting that the behavior of other "boolean
contexts" is unaffected by this change. For example, person[@married] still
selects all person elements that have a married attribute, regardless of
that attribute's typed value. If you only want married people, you would
write person[@married=true()] which is an example of the aforementioned
departure from XPath 1.0.


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