メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5125000 36.1041667, 139.5187500 36.1041667, 139.5187500 36.1083333, 139.5125000 36.1083333, 139.5125000 36.1041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral