v t e Documentation science

Has list	Persons (person) Places (human settlement) Artworks (work)

Classification scheme	list of Wikidata properties (related category) list of Wikidata identifiers (related category) ...

v t e Wikidata qualifier • allowed qualifiers constraint

	start time (P580): time an entity begins to exist or a statement starts being valid end time (P582): moment when an entity ceases to exist or a statement stops being valid used by (P1535): item or concept that makes use of the subject (use sub-properties when appropriate) immediate cause of (P1536): immediate effect of this cause

subject type constraint (Q21503250): type of constraint for Wikidata properties: used to specify that the item described by such properties should be a subclass or instance of a given type → class → administrative territorial entity • human settlement • island • fictional country
value-type constraint (Q21510865): type of constraint for Wikidata properties: used to specify that the value item should be a subclass or instance of a given type → class → administrative territorial entity • human settlement • political territorial entity
contemporary constraint (Q25796498): type of constraint for Wikidata properties: used to specify that the subject and the object have to coincide or coexist at some point of history