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Re: [xsl] are multiple predicates same as boolean and
Subject: Re: [xsl] are multiple predicates same as boolean and From: Ronan Klyne <ronan.klyne@xxxxxxxxxxx> Date: Fri, 21 Nov 2008 14:40:07 +0000 |
Andrew Welch wrote: >>> apart from this use case you cited, are all other forms equivalent >>> (which do not involve positional predicates)? >> No. >> >>> like, >>> X[@a='hi'][@b='hi..'] >> If X[@a='hi'] matches a node, then that node will become the context >> node when evaluating [@b='hi..'] >> >>> would be same as >>> X[@a='hi' and @b='hi..'] >> X is the context node here, so the predicate will be considering @b='hi..' >> >> X[P][Q] is equivalent to X[P and Q] if and only if Q does not depend on >> the context node at all. > > Only / will change the context node, so I would've thought one > predicate after the other is pretty much equivalent apart from cases > that rely on size of the selection (which is the only thing that > changes after each predicate) I was misunderstanding - sorry for the confusion. Considering this XML: <doc> <X @a="1"> <Y @b="2"/> </X> </doc> When <doc> is the context node, I was expecting that X[Y[@b]] would do the same as X[Y][@b] I (and Saxon) can see now that this is wrong. Thanks Andrew, # r -- Ronan Klyne Business Collaborator Developer Tel: +44 01189 028518 ronan.klyne@xxxxxxxxxxx www.groupbc.com
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