Subject: RE: [xsl] why is "(chapter//footnote)[1]" illegal? From: "Michael Kay" <mhk@xxxxxxxxx> Date: Sun, 24 Aug 2003 08:03:35 +0100 |
> boning up on my predicates and patterns, i'm reading > kay, p. 443, which states: > > "(chapter//footnote)[1] is not a valid pattern. (Why not? > No good reason, it's just that the spec doesn't allow it." > > but on p. 408, there is an explanation of the (apparently > acceptable) path expression "(chapter/para)[1]". > > so is it just the difference between using the child axis > and the descendant-or-self axis? it's not obvious to me > why the first should be illegal while the second is legal. The syntax for patterns is a small subset of the syntax for XPath expressions, and the subset doesn't allow parentheses. The subset was chosen to make it easy for implementations to test whether a node matches a pattern without going through the full algorithm of evaluating the expression for every ancestor of the node being tested. Michael Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
[xsl] Re: Re: why is "(chapter//foo, Dimitre Novatchev | Thread | RE: [xsl] why is "(chapter//footnot, Robert P. J. Day |
RE: AW: AW: [xsl] exclude result pr, Michael Kay | Date | RE: [xsl] Re: EXSL's dyn:evaluate(), Michael Kay |
Month |