メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402738398906 44.1706612290979, 142.40123190255 44.1704295606188, 142.40146433037 44.1696802961411, 142.402986629886 44.1699199748536, 142.402973548021 44.1700126165331, 142.402951521576 44.1700701285297, 142.402911742596 44.1701340653235, 142.402738398906 44.1706612290979)) ^^http://www.opengis.net/ont/geosparql#wktLiteral