メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.371963794702 43.7695298801368, 142.372278313882 43.7700909981088, 142.370691949849 43.7705522191552, 142.370379393381 43.7699837477218, 142.370072043642 43.7694247648817, 142.371642428994 43.768962580966, 142.371963794702 43.7695298801368)) ^^http://www.opengis.net/ont/geosparql#wktLiteral