メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.418381224672 43.7374363426142, 142.419055662949 43.7373965973667, 142.41914609111 43.7383142905188, 142.419147933849 43.7383838884171, 142.417856726947 43.7384752484519, 142.416770686918 43.7385247915792, 142.416705266231 43.7380037568268, 142.416652462762 43.7375381854521, 142.418381224672 43.7374363426142)) ^^http://www.opengis.net/ont/geosparql#wktLiteral