メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.389606071686 43.6835495335186, 142.390400602596 43.6837868628217, 142.389113464163 43.6861159016391, 142.388270724518 43.6858563645535, 142.387437310508 43.6855996573292, 142.388173719475 43.6842634501164, 142.388742011187 43.6832968106859, 142.389554619716 43.6835341590772, 142.389606071686 43.6835495335186)) ^^http://www.opengis.net/ont/geosparql#wktLiteral