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

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 → organization → relation → instance or subclass of
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 → position → relation → instance of
inverse constraint (Q21510855): type of constraint for Wikidata properties: used to specify that the referenced item has to refer back to this item with the given inverse property → property → organization directed by the office or position
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

office held by head of the organization (P2388): position of the head of this item

Four Days of Dunkirk (Q513691): French cycling competition

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