Subject: RE: [xsl] dynamic sorting From: "Michael Kay" <mhk@xxxxxxxxx> Date: Fri, 6 Feb 2004 00:14:44 -0000 |
> Thanks for pointing it out. I have one more question: > > But how do I combine test="self::book:title" with a variable > $sort, which will contain in this situation "title". You can only use self::x if you know the name x statically. What exactly is the string contained in variable $sort? Is it a lexical QName, of the form "[p:]xyz". If so, what does the prefix "p" mean; what namespace context should be used to interpret it? If you confine yourself to names in no namespace, you're OK to use [name()=$sort], but as soon as you want to handle names in a namespace, you really need two parameters, one for the namespace URI and one for the local name, and to write the test as [local-name()=$sort-1 and namespace-uri()=$sort-2]. Or in XSLT 2.0 you can use a variable of type xs:QName instead of using a string, and test [node-name() = $qname]. Incidentally, dynamic XPath evaluation (xx:evaluate()) also suffers from this problem. There is no way of writing a general XPath expression that isn't dependent on its namespace context, which means that manipulating XPath expressions as strings is intrinsically error-prone. Michael Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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