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Retrieve relation properties.
relation_properties(x) relation_property(x, which)
A relation.
Property name (character string).
These functions are used for the extrinsic properties of relations. Others can be retrieved using the predicate functions.
relation() and relation_is() for all predicate functions defined on relations.
relation()
relation_is()
x <- as.relation(1 : 3) relation_properties(x) relation_property(x, "is_endorelation")
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