[New metadata element]: mapping_state

[NuriaQueralt]

Element id (e.g. creator_id, mapping_tool_version): (Must be lower case and contain only letters and underscores.)

mapping_state

Value data type (e.g. URI, URL, text, xsd:boolean):

ENUM: active, obsolete, under curation, other

Description (Provide a human-readable description that clarifies the intended use of the metadata element.)

The mapping state is described from the perspective of the mapping publisher, and describes whether the mapping is active, obsolete, or under review by curators. This is aligned with what is done by ontologists when a class or a property is withdrawn.