メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.765271253751 35.4323937513976, 136.764736407877 35.4323893855777, 136.764738355465 35.4323524575809, 136.764734883542 35.4321763974741, 136.765277368313 35.4321844496895, 136.765271253751 35.4323937513976)) ^^http://www.opengis.net/ont/geosparql#wktLiteral