メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.912620851345 43.522925615157, 141.910891827716 43.5232112475169, 141.910583162587 43.5220854707229, 141.910607371408 43.5220767512492, 141.912269641975 43.5218202900587, 141.912620851345 43.522925615157)) ^^http://www.opengis.net/ont/geosparql#wktLiteral