new_ref = ServiceReference(str)
if not mutableBouquet.addService(new_ref.ref, cur_service.ref):
mutableBouquet.removeService(cur_service.ref)
new_ref = ServiceReference(str)
if not mutableBouquet.addService(new_ref.ref, cur_service.ref):
mutableBouquet.removeService(cur_service.ref)