メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.364018000043 43.7648341030559, 142.362497117388 43.7652827397661, 142.361852515359 43.7641397752961, 142.363427493158 43.7636846046109, 142.363715021221 43.7642677737675, 142.364018000043 43.7648341030559)) ^^http://www.opengis.net/ont/geosparql#wktLiteral