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- 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 • animal
- 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 → sex or gender
- difference-within-range constraint (Q21510854): type of constraint for Wikidata properties: used to specify that the value of a given statement should only differ in the given way. Use with qualifiers minimum quantity/maximum quantity → together with date of birth and date of death
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