メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5125000 38.1583333, 139.5187500 38.1583333, 139.5187500 38.1625000, 139.5125000 38.1625000, 139.5125000 38.1583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral