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

	point in time (P585): date something took place, existed or a statement was true; for providing time use the "refine date" property (P4241) determination method or standard (P459): how a value is determined, or the standard by which it is declared

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 → country • population • male population
single-value constraint (Q19474404): type of constraint for Wikidata properties: used to specify that this property generally contains a single value per item → separator → point in time
integer constraint (Q52848401): constraint type used when values have to be integer only
range constraint (Q21510860): type of constraint for Wikidata properties: used to specify that the value must be between two given values
required qualifier constraint (Q21510856): type of constraint for Wikidata properties: used to specify that the listed qualifier has to be used → property → point in time