Subject: Re: AW: [xsl] how can I compare two xml files ? From: Richard Light <richard@xxxxxxxxxxxxxxxxx> Date: Thu, 19 Apr 2001 10:02:55 +0100 |
In message <55CB9FEAE87DD411A83200508BDF0DFE06D179@xxxxxxxxxxxxxxxxxxx>, Mengel Andre (FV/SLM) * <Andre.Mengel@xxxxxxxxxxxx> writes >> André, >> >> I have tackled this problem in a slightly different way. I iterate >> through the two files, comparing them as I go. The result is a third >> XML document which lists the differences between the two files, in a >> form which I hope can be used to reproduce the earlier version of a >> document from its current form and this 'differences' document. >> >> The style sheet is attached, in the hope that it might be a starting >> point for your own work. >If I have understood you, then two xml-files would be the >same if the third file generated with your stylesheet would be >an empty file (Because no differences could be found). Not quite. As it stands at present, the third file contains a 'skeleton' of the element structure of the current version of the document. You could easily alter the style sheet so that it didn't do this, but I wanted to know where the changed elements etc. occurred in the document, and this was an easy way of providing this information. >Would this file also be empty if the attributes of two documents >have different orders ? Since the order of attributes is essentially undefined, it isn't taken into account. >What happens if two documents are the same, but one of them >contains ignorable whitespace ? The process relies on the input that is given to an XSLT processor, i.e. the output from an XML parser. If the parser has left the ignorable white space alone (as it should), then it will be available for comparison. Note, however, that the style sheet has a 'normalize' parameter (true by default) which applies the normalize-space() function to all textual values before making a comparison, and also ignores text() nodes which consist solely of white space. (Since this reply is going to the list, I've attached the style sheet so the curious can see what I'm talking about! All due credit to Oliver Becker, whose 'merging' style sheet has been shamelessly used as the basis for this work.) Richard Light. Richard Light SGML/XML and Museum Information Consultancy richard@xxxxxxxxxxxxxxxxx XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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