メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0500000 37.8833333, 139.0562500 37.8833333, 139.0562500 37.8875000, 139.0500000 37.8875000, 139.0500000 37.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral