メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397178131218 44.1878949830708, 142.395885982476 44.1876938094056, 142.395965568062 44.1874246969366, 142.396170307286 44.1867567854268, 142.396889875317 44.1868741175556, 142.397256575306 44.1869339079766, 142.397449236806 44.1869653181262, 142.397178131218 44.1878949830708)) ^^http://www.opengis.net/ont/geosparql#wktLiteral