Subject: [xsl] Using DOM with XSLT/XPATH (might be dangerous ?) From: Joseph Kesselman <keshlam@xxxxxxxxxx> Date: Wed, 14 Aug 2002 13:18:15 -0400 |
> a) It is assumed that the XSLT processor understands the DOM > returned by the invoked java method. True. That's up to your XSLT processor's extension mechanism, since at this time extensions are not very precisely defined in the XSLT spec. Some processors, eg Xalan, explicitly list DOM nodes as one of the possible data types which can be returned from extensions, and promise to Do Something Appropriate with them. Others may not, in which case you should return the data another way (as a SAX source? as XML text?). Check your processor's documentation for details. > b) It is assumed that the internal realization of the XPath is DOM > based. Nope. It just means the extension mechanism needs to be able to read the data out of the DOM node you've returned. It may operate directly on that node object... or it may walk the node's DOM tree and copy its content into a format which the processor would prefer to operate on... or it may do both or either depending on the context in which the returned value is used. Again, that's up to the processor -- XSLT 1.0 didn't describe what extension functions return or how it's interpreted, only how they're invoked. Of course there's the separate question of whether the value returned to the variable is a treated as a Result Tree Fragment (which an XPath can be applied to) or as a list of nodes (which can't be directly processed as an XPath, and which would need to be converted via something like Xalan's nodeset() extension). Again, that's a question of how your processor implemented the case of an extension that returns a DOM node. I think this issue will mostly Go Away in XSLT 2.0, with the introduction of the Temporary Tree concept. ______________________________________ Joe Kesselman / IBM Research XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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