Enforcing data policy using style sheet processing
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United States of America Patent
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Jul 1, 2003
Grant Date -
N/A
app pub date -
Aug 30, 1999
filing date -
Aug 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Enforcing data policy using style sheet processing. A Document Type Definition (DTD) associated with an Extensible Markup Language document is modified to specify a reference to stored data policy to be applied to document elements. Each data element may specify a different data policy. This technique uses minimal network transmission overhead, as the policy itself is not transmitted through the network until the DTD reaches the node where the data policy will be applied. Programming code implementing the data policy is then retrieved, using the references, by an Extensible Stylesheet Language (XSL) processor instrumented according to the present invention. Data policy is preferably enforced by overriding the existing XSL 'value-of' method. DTD information describing a document element may be suppressed from a DTD being generated for the output document of the data policy enforcement process, providing privacy protection for the details of the associated policy.
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