メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.840089435651 37.432303483799, 138.840198659337 37.432607288368, 138.840157217208 37.4328132553086, 138.839486912374 37.4328029428126, 138.838871579042 37.4327569880796, 138.83876100904 37.4324179872172, 138.839386407027 37.4322979131221, 138.839441047796 37.4324543212218, 138.840089435651 37.432303483799)) ^^http://www.opengis.net/ont/geosparql#wktLiteral