メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3062500 35.4500000, 139.3125000 35.4500000, 139.3125000 35.4541667, 139.3062500 35.4541667, 139.3062500 35.4500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral