メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4625000 35.8583333, 139.4687500 35.8583333, 139.4687500 35.8625000, 139.4625000 35.8625000, 139.4625000 35.8583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral