メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3000000 37.9875000, 139.3062500 37.9875000, 139.3062500 37.9916667, 139.3000000 37.9916667, 139.3000000 37.9875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral