bearer of at some time
has role at some time
hasRoleAt
has-r_st
Alan Ruttenberg: This is a binary version of a ternary time-indexed, instance level, relation. The BFO reading of the binary relation 'has role at some time@en' is: exists t, exists_at(x,t) & exists_at(y,t) & 'has role@en'(x,y,t)
(iff (hasRoleAt a b t) (roleOfAt b a t)) // axiom label in BFO2 CLIF: [068-001]
a has_role b at t =Def. b role_of a at t. (axiom label in BFO2 Reference: [068-001])
role