t1: relation_id: 1 member_role: "some" member_type: "Way" member_id: 3 t2: relation_id: 1 member_role: "some" member_type: "Node" member_id: 5 t3: relation_id: 1 member_role: "some" member_type: "Relation" member_id: 3 t4: relation_id: 3 member_role: "some" member_type: "Node" member_id: 5 t5: relation_id: 2 member_role: "some" member_type: "Node" member_id: 5 public_used: relation_id: 6 member_role: "used by other relation" member_type: "Relation" member_id: 5