メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349509747259 43.7597944944023, 142.348525396962 43.7605577252788, 142.347010887449 43.7595216267458, 142.347810292403 43.7588888735684, 142.347978283076 43.758756330745, 142.349509747259 43.7597944944023)) ^^http://www.opengis.net/ont/geosparql#wktLiteral