question: public void addMembersToRelation ( Relation relation , ArrayList < OsmElement > members ) { dirty = true ; for ( OsmElement e : members ) { undo . save ( e ) ; RelationMember rm = new RelationMember ( "" , e ) ; relation . addMember ( rm ) ; e . addParentRelation ( relation ) ; } relation . updateState ( OsmElement . STATE_MODIFIED ) ; insertElementSafe ( relation ) ; }
target:  Add further members without role to an existing relation