protected void populate() {
Relation r1 = new Relation();
r1.addMember(new RelationMember("role1", new Node(1)));
r1.addMember(new RelationMember("role2", new Way(2)));
r1.addMember(new RelationMember("role3", new Relation(3)));
Relation r2 = new Relation();
r2.addMember(new RelationMember("role1", new Node(1)));
r2.addMember(new RelationMember("role2", new Way(2)));