メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.34717998968 43.0799047126817, 141.347043985067 43.0804764688639, 141.345484336667 43.0802656693252, 141.345615420913 43.0796902194957, 141.345781968334 43.0791300304625, 141.346159031797 43.0791816811863, 141.346566725204 43.0792447537752, 141.347326185731 43.0793444316988, 141.347260597899 43.0796358485923, 141.34717998968 43.0799047126817)) ^^http://www.opengis.net/ont/geosparql#wktLiteral