Subject: RE: [xsl] xpath confusion (compound xpath) From: Edward.Middleton@xxxxxxxxxxx Date: Wed, 22 Jan 2003 14:23:59 +0900 |
Mabe this will help explain. Here is an example of what is happending in your xpath. Your xpath /grammar/start/element/zeroOrMore/choice/element[1]//zeroOrMore//*[self=current()] Based on the specification http://www.w3.org/TR/xpath#predicates [8] Predicate ::= '[' PredicateExpr ']' "A predicate filters a node-set" In this example your node set will be the nodes matched by node-set = /grammar/start/element/zeroOrMore/choice/element[1]//zeroOrMore//* >From the specification "For each node in the node-set to be filtered, the PredicateExpr is evaluated with that node as the context node" Your PredicateExpr will be PredicateExpr = "self=current()" in psydo code think for each node in the node-set current = node // context node = current "self" = current.nodeName next Edward Middleton -----Original Message----- From: S Woodside [mailto:sbwoodside@xxxxxxxxx] Sent: Wednesday, January 22, 2003 1:52 PM To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx Subject: Re: [xsl] xpath confusion (compound xpath) On Sunday, January 19, 2003, at 02:41 AM, Dimitre Novatchev wrote: >> What am I doing wrong? > > The problem is here: > >> <xsl:when >> test="/grammar/start/element/zeroOrMore/choice/element[1]// >> zeroOrMore//*[self=current()]"> > > You are testing if the current node has child named "self" and its > string value is equal to the string value of the current node. gah! I can't believe it. I must have though I was using the self:: axis. Would self::* have worked? How do I know if it's going to treat the stuff inside the predicate as a string or as a node-set? I find the XPath spec to be unusually confusing ... would you mind pointing out the part of the spec that defines this, because it's totally unclear to me. In fact, I find there's a distinctive lack of clear documentation on the net. I'd rather not have to waste the money and dead trees on the O'Reilly book and usually the online docu is enough for me. > Obviously, you wanted: > > /grammar/start/element/zeroOrMore/choice/element[1]//zeroOrMore// > *[generate-id() = generate-id( current())] Thanks, simon --- www.simonwoodside.com XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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