メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.915523725017 43.5401870473453, 141.914550021235 43.5410744006567, 141.913238686794 43.5403499108464, 141.914237498729 43.5394379935393, 141.915523725017 43.5401870473453)) ^^http://www.opengis.net/ont/geosparql#wktLiteral