メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.571507479571 42.9786625514431, 141.571364814684 42.9790236341352, 141.57064515684 42.978981389867, 141.569935511436 42.9789390591735, 141.56937457657 42.9788964824016, 141.569476783676 42.9781094422814, 141.570014206139 42.9781641170147, 141.570687011501 42.9782110811621, 141.571585140067 42.9782851879297, 141.571521596264 42.9785939208929, 141.571507479571 42.9786625514431)) ^^http://www.opengis.net/ont/geosparql#wktLiteral