| http://www.w3.org/ns/prov#value | - Good point. It illustrates that the data/metadata relationship holds within a context. In the context of web service message exchanges, you could say the messages being exchanged are data and the descriptive artifacts such as WSDL and Schema are the metadata. But within the context of a single message, there may data (like a payload) and metadata about that data (like, whether it is authentic).
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