メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.349434765887 43.1222208895117, 141.350012841107 43.1223042518493, 141.349910689427 43.1226843405422, 141.349716096449 43.1235479020472, 141.349604524369 43.1240527454885, 141.348695055711 43.123796027986, 141.348526874458 43.1237485045565, 141.3485704814 43.1234138119233, 141.348614116158 43.1232209682556, 141.348654660969 43.1229900534407, 141.348834527404 43.122123636602, 141.349434765887 43.1222208895117)) ^^http://www.opengis.net/ont/geosparql#wktLiteral