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Organizations are increasingly using the eXtensible Markup Language (XML) for document representation and exchange on the Web. To protect an XML document from unauthorized access, authorizations are specified on the XML document itself or on the Document Type Definition (DTD) that defines the type of the XML document. Each XML document or DTD is associated with an XML Access Sheet (XAS) that specifies the authorizations. The DTD not being an XML document complicates the specification and enforcement of authorization policies. To overcome the above mentioned problem, XML Schemas need to be used instead of DTDs.
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