メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908887760159 43.531964039962, 141.906012953356 43.5301769158275, 141.907929996568 43.5284169897377, 141.910860792635 43.5301737726386, 141.909305977065 43.5315774100783, 141.908887760159 43.531964039962)) ^^http://www.opengis.net/ont/geosparql#wktLiteral