The use of Metadata in URIs

This finding addresses several questions regarding Uniform Resource Identifiers (URIs). Specifically, what information about a resource can or should be embedded in its URI? What metadata can be reliably determined from a URI, and in what circumstances is it appropriate to rely on the correctness of such information? In what circumstances is it appropriate to use information from a URI as a hint as to the nature of a resource or its representations? Simple examples are used to explain the tradeoffs involved in employing such metadata in URIs.

a TAG finding on good URI design

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