Subject: [xsl] different versions of xmlns:foo are never usable together? From: Brendan Kehoe <brendan@xxxxxxx> Date: Thu, 14 Jul 2005 16:19:28 +0100 |
I'm working on a project that's using XML & XSLT to do lots of munging of files. I've run into an odd problem that I'm hoping isn't a issue of who-controls-what. For example, I've got two files with recipes in them, cake.xml and muffin.xml. In cake.xml is <food:recipe xmlns:food="http://who/knows/Food/1.0"> ... </food:recipe> In muffin.xml is <food:recipe xmlns:food="http://who/knows/Food/1.1"> ... </food:recipe> I'd like to use both of them on a style sheet like: <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" xmlns:food="http://who/knows/Food/1.0"> <xsl:output method="text" encoding="UTF-8"/> <xsl:strip-space elements="*"/> <xsl:template match="food:recipe"> <xsl:value-of select="food:name"/>: <xsl:value-of select="food:calories"/> </xsl:template> </xsl:stylesheet> But the xmlns:food string not being the same makes is selective over which it's willing to use. I understand the basic rule that xmlns:food has to be the same to be honored. However, this would seem to never allow for backwards compatibility. If I want version 2.0 of the 'food' namespace to accept everything 1.0 did, but also add stuff like <food:wine-suggestions/>, is it possible? My stylesheet is interested in some basic bits that're true of both versions. I understand that xmlns:food's contents are irrelevant, and that they're supposed to match. But this would mean the moment I update my RecipePrinter app to a newer version which includes some newer recipes, I have to convert or get rid of all older recipes. Please tell me I'm missing something. :-) Thanks, B P.S. It'd be cool if I could do xmlns:food="http://.../1.0 http://.../2.0" to cite a union of namespaces I can accept. But that seems to threaten to have lots of problems.
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