メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2000000 35.2833333, 139.2062500 35.2833333, 139.2062500 35.2875000, 139.2000000 35.2875000, 139.2000000 35.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral