メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.341219013357 43.7694628202067, 142.341530263521 43.7700248938929, 142.340165288703 43.7704516709079, 142.339993676643 43.7701609233736, 142.339845664699 43.7698658847286, 142.339650062954 43.7695345443315, 142.339559644258 43.7693293656045, 142.340941722229 43.7689274245794, 142.341219013357 43.7694628202067)) ^^http://www.opengis.net/ont/geosparql#wktLiteral