メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.420331152408 43.7497928719478, 142.420366777521 43.7502096825108, 142.420367856095 43.7502222851493, 142.419063044696 43.7502875455144, 142.419018202673 43.7498759504576, 142.418956737746 43.7493772886239, 142.420285179527 43.7492931846118, 142.420331152408 43.7497928719478)) ^^http://www.opengis.net/ont/geosparql#wktLiteral