From Terminology Sandbox Wiki
URIs of the form "http://www.w3.org/1999/02/22-rdf-syntax-ns#Property%22 are not allowed.
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Notes: Date may be used to express temporal information at any level of granularity. Recommended best practice is to use an encoding scheme, such as the W3CDTF profile of ISO 8601 [W3CDTF].
Constraints in the context of Dublin Core: