メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5312500 38.4666667, 139.5375000 38.4666667, 139.5375000 38.4708334, 139.5312500 38.4708334, 139.5312500 38.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral