def get_metadata(self, **kwargs):
        return {}
generates (vertex1_label, vertex2_label, edgepayload) from osmdb
dataset/ETHPy150Open hydroshare/hydroshare2/ga_resources/drivers/__init__.py/Driver.get_metadata--crossover with--dataset/ETHPy150Open bmander/graphserver/pygs/graphserver/compiler/gdb_import_osm.py/edges_from_osmdb