メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.863849494293 43.3439899011195, 141.861772788941 43.3443193876583, 141.861174512629 43.3422828136934, 141.861687411024 43.3422078279324, 141.863231365305 43.3419690886644, 141.863849494293 43.3439899011195)) ^^http://www.opengis.net/ont/geosparql#wktLiteral