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 → human • fictional character • character that may or may not be fictional
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 → human • fictional character • character that may or may not be fictional
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 → sex or gender • place of birth • date of birth
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 → relative

stepparent (P3448): subject has the object as their stepparent

Wilhelm Friedemann Bach (Q107277): German composer, organist, harpsichordist (1710-1784)

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