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

	series ordinal (P1545): position of an item in its parent series (most frequently a 1-based index), generally to be used as a qualifier (different from "rank" defined as a class, and from "ranking" defined as a property for evaluating a quality).

item-requires-statement constraint (Q21503247): type of constraint for Wikidata properties: used to specify that an item with this property should also have another given property → property → occupation → item of property constraint → astronaut
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 → human • fictional character • monkey in space
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 → crewed spacecraft • spaceflight • fictional spacecraft
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 → crew member(s)