メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.289556656964 43.1538427374479, 141.290124168698 43.1534252481241, 141.292547497418 43.1552579165015, 141.290919929991 43.15643867059, 141.290276225116 43.1559598222294, 141.289669372008 43.1555083551323, 141.289061673442 43.1550562458939, 141.288789288602 43.1548536112847, 141.288487595634 43.1546291707866, 141.289556656964 43.1538427374479)) ^^http://www.opengis.net/ont/geosparql#wktLiteral