メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5875000 35.8333333, 139.5937500 35.8333333, 139.5937500 35.8375000, 139.5875000 35.8375000, 139.5875000 35.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral