The following diagram represents how it can be managed defining groups of RootEntities.<br/>RootEntityGroup is a collection of all the RootEntities in the group as defined by RootEntityGroupMember. <br/>Each RootEntityGroupMember specifies the period for which the RootEntity is valid in the RootEntityGroup.<br/>The RootEntityGroupRelationship’s type attribute is a categorization of the relationship, such as migration, substitution, dependency, exclusivity. The validFor attributes is the period for which the RootEntityGroupRelationship and RootEntityGroup are valid.<br/>In addition, minimum, maximum and default numbers can be specified for the relationship.<br/>The 0..1 RootEntityRepresentsPrimaryEntity association member supports “and” and “or” associations among members of a group.<br/>