| http://www.w3.org/ns/prov#value | - This 3-tuple, or triplet, approach to policy language definition is simple and powerful for some environments, but is unfortunately limited -- in at least three ways -- for other environments. [1] Firstly, the built-in assumption that the object to be protected is (some portion of) an XML document is clearly unsuitable for environments that wish to protect other kinds of documents, data, devices,
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