メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405471437592 44.1717269859666, 142.403579953835 44.1714654773368, 142.403508004598 44.1711102101736, 142.403453728351 44.170770409177, 142.403449686398 44.1707510598873, 142.405639204542 44.1710794967781, 142.405471437592 44.1717269859666)) ^^http://www.opengis.net/ont/geosparql#wktLiteral