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The role of XML in data exchange is evolving from one of merely conveying the structure of data to one that also conveys its semantics. In particular, several proposals for key and foreign key constraints have recently appeared, and aspects of these proposals have been adopted within XMLSchema. Although several validators for XMLSchema appear to check for keys, relatively little attention has been paid to the general problem of how to check constraints in XML. This paper examines the problem of checking keys in XML documents and describes a native validator based on SAX.

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Format:PDFSize:197 KB
Date:Oct 2008
Pages:12

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