メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.88887624136 43.0142266574917, 142.888760020026 43.0141560606932, 142.887735589244 43.0135456049733, 142.888170471475 43.0131675569715, 142.88853971645 43.01284655752, 142.888719656834 43.0126901267111, 142.889829872258 43.0133802711706, 142.889359682935 43.0137951649297, 142.88887624136 43.0142266574917)) ^^http://www.opengis.net/ont/geosparql#wktLiteral