メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3875000 38.0083333, 139.3937500 38.0083333, 139.3937500 38.0125000, 139.3875000 38.0125000, 139.3875000 38.0083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral