メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.374712188064 43.05160423183, 141.374187961846 43.0511484932051, 141.375111112036 43.0505858778463, 141.375545904484 43.0503161084278, 141.376066301425 43.0507648493396, 141.374712188064 43.05160423183)) ^^http://www.opengis.net/ont/geosparql#wktLiteral