Subject: [xsl] positional predicates in XPath vs XQL From: "Howard Katz" <howardk@xxxxxxxxxx> Date: Fri, 23 Nov 2001 15:35:59 -0800 |
I'm implementing an engine that evaluates XPath. I'm currently working on the part of the engine that implements positional predicates. I've previously worked this out for location paths in XQL, but I think the semantics are different in the two languages and want to make sure I understand the differences. In XQL if you say (pretending for the moment that positions start from 1 as they do in XPath, rather than 0): /section/para[ 1 ] and you have a tree that looks like this: 1 section 2 para 3 para 4 section 5 para 6 section 7 para 8 para 9 para you'll get back this nodeset: <2>, <5>, <7> You can paraphrase this XQL query as saying, "Give me back the 1st child node of each <section> element." Similarly, "/section/para[ 2 ]" returns <3>, <8>, and if you say "/section/para[ 3 ]", you get back the single node, <9>. To my understanding, the same location path in XPath only returns a single node, <2>. Is my understanding correct? Howard XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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