From Terminology Sandbox Wiki
URIs of the form "http://www.w3.org/1999/02/22-rdf-syntax-ns#Property%22 are not allowed.
"DateText" is not a valid format and is expected to consists of "namespace":"identifier" (e.g. "foaf:name").
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Notes: if possible ISO dates should be used
Example(s): 1. April 2015
History Note: added in
Constraints in the context of ABCD:
- cardinality 0..1 (=optional single occurrence)