メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.350246684973 44.4890167918931, 142.349153808678 44.488771688316, 142.348921530003 44.4887172922701, 142.34884676468 44.4886939426487, 142.349248855718 44.4878630272698, 142.350634428506 44.4882023379703, 142.350246684973 44.4890167918931)) ^^http://www.opengis.net/ont/geosparql#wktLiteral