メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.998175559812 38.5425030243124, 140.99786715979 38.5420157120883, 140.999467613173 38.5414175730251, 141.000038568569 38.5423512862107, 140.998523022356 38.5429159478324, 140.998362390985 38.542744166215, 140.998247735744 38.5426186296742, 140.998175559812 38.5425030243124)) ^^http://www.opengis.net/ont/geosparql#wktLiteral