Subject: RE: [xsl] positional predicates in XPath vs XQL From: "Howard Katz" <howardk@xxxxxxxxxx> Date: Sat, 24 Nov 2001 03:35:03 -0800 |
> 1 section > 2 para > 3 para > 4 section > 5 para > 6 section > 7 para > 8 para > 9 para > > [Note that this is not a well-formed XML document, though XPath > can work on well-formed text entities such as this.] Right. > The XPath is equivalent to the expanded syntax > /child::section/child::para[position()=1]. The first / selects the root > node. The next expression selects all <section> children of the root - > nodes 1, 4, and 6 in your example. The next expression, child::para, > selects nodes for each node in its context. For node 1, nodes 2 > and 3 are selected; for node 4, node 5 is selected; for node 6, nodes 7, 8, > and 9 are selected. For each node set, the predicate is evaluated, > returning true for nodes 2, 5, and 7, as they are each the first in their node set. Ah, that was what I needed. I had just spent 1/2 hour trying the parse the English in the section of the XPath specification on predicates and had obviously failed miserably. Your example makes it much clearer. Thanks, Howard > ~Chris > > P.S. YM "ratiocination". HTH. HAND. Huh? XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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