メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.140352663662 38.9328813615336, 141.139070809263 38.9328967541108, 141.139332957636 38.9321277918878, 141.139548677732 38.9321329984423, 141.139595566765 38.9323964515652, 141.140230155535 38.9323277860877, 141.140352663662 38.9328813615336)) ^^http://www.opengis.net/ont/geosparql#wktLiteral