メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398343128505 44.1727902545343, 142.396447754766 44.172502263192, 142.396452606225 44.1724839211185, 142.396768850986 44.171444764047, 142.398662724662 44.1717509825397, 142.398343128505 44.1727902545343)) ^^http://www.opengis.net/ont/geosparql#wktLiteral