メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.386233941248 44.1825914253339, 142.384151907286 44.1822642659636, 142.38270893108 44.1820143846722, 142.382905685882 44.1814303017391, 142.386417225612 44.1820011118112, 142.386233941248 44.1825914253339)) ^^http://www.opengis.net/ont/geosparql#wktLiteral