メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.048259309859 42.9169793469935, 143.047518749779 42.9169337233849, 143.047488444231 42.9171435234118, 143.047481019863 42.9171948470443, 143.047476141229 42.9172283595093, 143.046648411457 42.9171459898666, 143.046651891991 42.917118958165, 143.04665621959 42.9170909357011, 143.046865740178 42.9157291169215, 143.047662248602 42.9157923599774, 143.048387963736 42.9158454705088, 143.048259309859 42.9169793469935)) ^^http://www.opengis.net/ont/geosparql#wktLiteral