Schema constraints from a different file?
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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