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Have a look at schemaTron or, you could use raw XSLT.
Fraser.
>From: Dmitry Epstein <mitia@northwestern.edu>
>To: xml-dev@lists.xml.org
>Subject: [xml-dev] Schema constraints from a different file?
>Date: Sat, 22 Oct 2005 01:51:01 -0500
>
>I have a data-oriented project, in which the main data component
>is an XML catalogue of items, supplemented by a number of other
>XML files that specify additional information about some of the
>items from the main catalogue, or reference particular items in
>descriptions of other data. Right now this is accomplished by
>giving each item in the main catalogue a sequential number, then
>referencing that number form other files. I am trying to
>introduce Schema validation into this project, and I am
>wondering how I could validate item references in files other
>than the main item catalogue.
>
>For example, suppose the main catalogue contains elements that
>look like this:
>
><item>
> <itemID>ABC123</itemID>
> ...
></item>
><item>
> <itemID>DEF456</itemID>
> ...
></item>
>...
>
>Then in another XML file there are elements that look like this:
>
><itemSpecs>
> <itemID>DEF456</itemID>
> ...
></itemSpecs>
>...
>
>Basically, I would like to develop schemas that impose
>constraints on an element or attribute in one XML file based on
>element or attribute values from another XML file. Is this at
>all possible? I would consider making a file containing just a
>list of all available item IDs, if that would help solve the
>problem.
>
>TIA
>
>
>
>
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