メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.339241952428 43.0926496025789, 141.339128991571 43.0930582967876, 141.337623109573 43.0928522497741, 141.33773850682 43.0924417480972, 141.337862699219 43.0919299017881, 141.339366387225 43.092127066705, 141.339241952428 43.0926496025789)) ^^http://www.opengis.net/ont/geosparql#wktLiteral