メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.419469044847 43.7418129386252, 142.419533740887 43.7422995678335, 142.418252880991 43.7423644621588, 142.418192834169 43.7418719879655, 142.41814850713 43.7413989529012, 142.419424681268 43.7413347009269, 142.419469044847 43.7418129386252)) ^^http://www.opengis.net/ont/geosparql#wktLiteral