メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.650447727753 42.8282470991484, 141.649950281795 42.8286662767303, 141.648803757681 42.8296191730112, 141.647864565965 42.8304333982067, 141.64769452334 42.8302366961233, 141.647215841226 42.8297397339176, 141.646676561611 42.8292060183402, 141.648519145211 42.8276842966286, 141.649004558083 42.827294249786, 141.650447727753 42.8282470991484)) ^^http://www.opengis.net/ont/geosparql#wktLiteral