メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.411278902316 43.8250195959367, 142.409664844184 43.8238234522284, 142.411427646642 43.8225045567846, 142.412115092297 43.8220263475677, 142.413770646628 43.8231998586403, 142.411278902316 43.8250195959367)) ^^http://www.opengis.net/ont/geosparql#wktLiteral