メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351790767123 43.7744127769359, 142.351857239564 43.7745381161069, 142.352012086913 43.7748274871081, 142.350542736179 43.7752500923536, 142.350310757135 43.7748246654108, 142.350091336133 43.7744205141675, 142.351083768132 43.7741465662358, 142.351497442522 43.7740340124438, 142.351515322874 43.7740268763785, 142.351592000804 43.7741687316301, 142.351650867268 43.7741521009173, 142.351790767123 43.7744127769359)) ^^http://www.opengis.net/ont/geosparql#wktLiteral