メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.368903781169 43.7640531470097, 142.369200280485 43.7645887755549, 142.367659068503 43.7650332508679, 142.367345895337 43.764499744851, 142.367058407234 43.7639502493437, 142.368590182614 43.7635110835397, 142.368903781169 43.7640531470097)) ^^http://www.opengis.net/ont/geosparql#wktLiteral