This property relates an E39 Actor to the E74 Group of which that E39 Actor is a member. Groups, Legal Bodies and Persons, may
all be members of Groups. A Group necessarily consists of more than one member. This property is a shortcut of the more fully developed
path from E74 Group through P144 joined with (gained member by), E85 Joining, P143 joined (was joined by) to E39 Actor The property P107.1
kind of member can be used to specify the type of membership or the role the member has in the group.