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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 → person • fictional character • character that may or may not be fictional • lineage • fictional family
- 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 → family name → relation → instance of ( homonymy)
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