メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.3125000 37.9958334, 139.3187500 37.9958334, 139.3187500 38.0000000, 139.3125000 38.0000000, 139.3125000 37.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral