メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404459502435 44.1794192535351, 142.403975756597 44.1793430138258, 142.403398954202 44.1792520963337, 142.403687875787 44.1782703065046, 142.404739734902 44.1784411991961, 142.404459502435 44.1794192535351)) ^^http://www.opengis.net/ont/geosparql#wktLiteral