メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404038313278 44.1736262654644, 142.403387628014 44.1735372205204, 142.402608340356 44.1734129385659, 142.402732386029 44.1729478937326, 142.402884267927 44.1724304791477, 142.403759813379 44.1725558078856, 142.403786820306 44.1727131400959, 142.403896345348 44.1733645630168, 142.404038313278 44.1736262654644)) ^^http://www.opengis.net/ont/geosparql#wktLiteral