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URIs of the form "http://www.w3.org/1999/02/22-rdf-syntax-ns#Property%22 are not allowed.
No type definition was found for "TechnicalContact-@preferred" in the abcd import.
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Notes: As a rule, the group of the "recommended" attribute should be set to the same as the corresponding element.
Constraints in the context of ABCD:
- cardinality 0..1 (=optional single occurrence)