media legend (P2096): qualifier to describe the media of the statement. This avoids legend storage in the local infobox when the media is defined at Wikidata. For the date, use P585 instead
point in time (P585): date something took place, existed or a statement was true; for providing time use the "refine date" property (P4241)
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 • human
format constraint (Q21502404): type of constraint for Wikidata properties: used to specify that the value for this property has to correspond to a given pattern → File:
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 • place of burial • date of death • date of birth