メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.8750000 35.7333333, 139.8812500 35.7333333, 139.8812500 35.7375000, 139.8750000 35.7375000, 139.8750000 35.7333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral