IEnumerable <AvailableRelationship> GetAvailableRelationships(NonDirectionalRelationship relationship)
 {
     return(new[] {
         new AvailableRelationship {
             RelationshipIdentity = relationship.GetIdentity(),
             Participant = RelationshipParticipant.Primary,
             Summary = relationship.PrimarySummary,
         },
     });
 }
 public void Visit(NonDirectionalRelationship relationship)
 {
     summary = relationship?.PrimarySummary;
 }