メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9437500 39.1791667, 139.9500000 39.1791667, 139.9500000 39.1833333, 139.9437500 39.1833333, 139.9437500 39.1791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral