メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.2500000 37.7583333, 139.2562500 37.7583333, 139.2562500 37.7625000, 139.2500000 37.7625000, 139.2500000 37.7583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral