メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.947710046972 42.9411082825163, 142.946634507635 42.9417407002452, 142.94653126356 42.9418042731086, 142.945767407816 42.9411395023763, 142.945546873437 42.9409464455462, 142.945654093609 42.9408832003901, 142.946760006 42.940223529188, 142.947710046972 42.9411082825163)) ^^http://www.opengis.net/ont/geosparql#wktLiteral