quality relational quality B is a relational quality if for some independent continuants c, d and for some time t: b is quality of c at t and b is quality of d at t. [BFO] relational quality an obligation between one person and another [BFO] a marriage bond, an instance of love, an obligation between one person and another. an instance of love [BFO] John’s role of husband to Mary is dependent on Mary’s role of wife to John, and both are dependent on the object aggregate comprising John and Mary as member parts joined together through the relational quality of being married. r-quality a marriage bond [BFO] (iff (RelationalQuality a) (exists (b c t) (and (IndependentContinuant b) (IndependentContinuant c) (qualityOfAt a b t) (qualityOfAt a c t)))) // axiom label in BFO2 CLIF: [057-001] RelationalQuality b is a relational quality = Def. for some independent continuants c, d and for some time t: b quality_of c at t & b quality_of d at t. (axiom label in BFO2 Reference: [057-001])