メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.400904704848 44.1798605150527, 142.400013993581 44.1796955812639, 142.399228207163 44.1795754000143, 142.399428067215 44.1789542809566, 142.401087422677 44.1792242825116, 142.400904704848 44.1798605150527)) ^^http://www.opengis.net/ont/geosparql#wktLiteral