メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347471626877 44.4874293244377, 142.347410569493 44.4874144347731, 142.346269109862 44.4871146072681, 142.346511553181 44.4866428171004, 142.347709987441 44.4869210077986, 142.347520985204 44.4873229347164, 142.347471626877 44.4874293244377)) ^^http://www.opengis.net/ont/geosparql#wktLiteral