メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906703806775 43.5282096435145, 141.905352663562 43.5274426877435, 141.905556237761 43.5272639377307, 141.905886549604 43.5269738562248, 141.907441656964 43.5267351453712, 141.908373928735 43.5265901192089, 141.908442779556 43.526579390337, 141.906703806775 43.5282096435145)) ^^http://www.opengis.net/ont/geosparql#wktLiteral