メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2437500 35.7041667, 139.2500000 35.7041667, 139.2500000 35.7083333, 139.2437500 35.7083333, 139.2437500 35.7041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral