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From: "Christian Nentwich" <c.nentwich@c...> > > > I have a series of XML documents. I want to ensure that when any of these > > documents > > contains the following element: > > <id></id> > > That the value supplied is unique across all <id> elements contained in all > > the documents. > > You can do this quite easily in xlinkit (see http://www.xlinkit.com) as > follows: ... The only choices are XLinkit and Schematron AFAIK. XLinkit is clearly superior for this kind of use. I recommend that anyone who needs to make assertions about constraints involving sets of documents should look at XLinkit, especially if you need a server-based solution. While Schematron can use document() to go between XML documents (e.g. to check something in an external locally-held controlled vocabulary) quite happily, I think document() is not robust (e.g. if the externally held document is unavailable). Cheers Rick Jelliffe
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