メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403043510858 44.1803951043364, 142.402873993072 44.1809062658945, 142.401191630313 44.1806455343285, 142.401456873379 44.1801359190124, 142.401543673927 44.1799691892071, 142.401692793523 44.1796864093005, 142.403206322182 44.1799041503477, 142.403043510858 44.1803951043364)) ^^http://www.opengis.net/ont/geosparql#wktLiteral