メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3062500 39.1958334, 141.3125000 39.1958334, 141.3125000 39.2000000, 141.3062500 39.2000000, 141.3062500 39.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral