メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9312500 42.4500000, 139.9375000 42.4500000, 139.9375000 42.4541667, 139.9312500 42.4541667, 139.9312500 42.4500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral