メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.259492069263 44.0271563554441, 144.259138517308 44.0276873282569, 144.258826135307 44.0275795770261, 144.25853023698 44.0274866366517, 144.258295082579 44.0270339786151, 144.258327961635 44.0270264340149, 144.259774861265 44.0266945736375, 144.259492069263 44.0271563554441)) ^^http://www.opengis.net/ont/geosparql#wktLiteral