メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.383200727934 43.8258877710029, 142.382525335966 43.8254254155757, 142.384909414691 43.8236980090264, 142.38553956676 43.824177360596, 142.383200727934 43.8258877710029)) ^^http://www.opengis.net/ont/geosparql#wktLiteral