メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.414711202951 43.8248511184251, 142.413720774427 43.825581809979, 142.412874372415 43.8261808939612, 142.412109978178 43.8256082429943, 142.411278902316 43.8250195959367, 142.413770646628 43.8231998586403, 142.415376445334 43.8243729399506, 142.414711202951 43.8248511184251)) ^^http://www.opengis.net/ont/geosparql#wktLiteral