メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.1062500 37.7416667, 139.1125000 37.7416667, 139.1125000 37.7458334, 139.1062500 37.7458334, 139.1062500 37.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral