メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.873462383707 37.5309077399312, 139.872542725124 37.5326540510429, 139.868212980501 37.5305656491496, 139.870548257079 37.5265684774951, 139.872469439105 37.527331780579, 139.875099138299 37.5281639189788, 139.873978076273 37.5298960913251, 139.873462383707 37.5309077399312)) ^^http://www.opengis.net/ont/geosparql#wktLiteral