メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.647715855866 42.8246091879577, 141.647114964459 42.8250899135806, 141.646560253326 42.8255371197005, 141.645542498919 42.8248678022265, 141.646100037736 42.8244294074955, 141.646703995949 42.8239330890285, 141.647715855866 42.8246091879577)) ^^http://www.opengis.net/ont/geosparql#wktLiteral