t1:
  relation_id: 1
  member_role: "some"
  member_type: "Way"
  member_id: 3
  version: 1
t2:
  relation_id: 1
  member_role: "some"
  member_type: "Node"
  member_id: 5
  version: 1
t3:
  relation_id: 1
  member_role: "some"
  member_type: "Relation"
  member_id: 3
  version: 1
t4:
  relation_id: 3
  member_role: "some"
  member_type: "Node"
  member_id: 5
  version: 1

t5:
  relation_id: 2
  member_role: "some"
  member_type: "Node"
  member_id: 5
  version: 1
  
public_used:
  relation_id: 6
  member_role: "used by other relation"
  member_type: "Relation"
  member_id: 5
  version: 1
