メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.1937500 35.9000000, 139.2000000 35.9000000, 139.2000000 35.9041667, 139.1937500 35.9041667, 139.1937500 35.9000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral