メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.330000486042 43.770109589049, 142.329273817271 43.7698813585795, 142.329916240955 43.7687210959482, 142.330713720594 43.7689740249867, 142.330000486042 43.770109589049)) ^^http://www.opengis.net/ont/geosparql#wktLiteral