メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.289556656964 43.1538427374479, 141.288487595634 43.1546291707866, 141.287308537869 43.1537319935193, 141.286053293088 43.1527767748125, 141.287115157678 43.1520201943489, 141.287693375797 43.1515997143049, 141.288063953295 43.1518691625418, 141.290124168698 43.1534252481241, 141.289556656964 43.1538427374479)) ^^http://www.opengis.net/ont/geosparql#wktLiteral