メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.469698043408 42.9712242883935, 141.468015774131 42.9706065761343, 141.467627277608 42.9699015368289, 141.468816579023 42.9691232895463, 141.468744562044 42.9688027972822, 141.46838249389 42.967895744592, 141.470318511382 42.967155700248, 141.471933858057 42.9682173352996, 141.471696021086 42.9685344559877, 141.471087101761 42.9693514231942, 141.469698043408 42.9712242883935)) ^^http://www.opengis.net/ont/geosparql#wktLiteral