メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.921607435692 43.5297179822274, 141.92216715117 43.5315569507115, 141.922622251503 43.5330521527583, 141.921962803422 43.5331514695672, 141.921080664282 43.5332842879356, 141.920636619718 43.5318018047512, 141.920078987805 43.529942547446, 141.919929775339 43.5294402139749, 141.921449008364 43.5291974443522, 141.921607435692 43.5297179822274)) ^^http://www.opengis.net/ont/geosparql#wktLiteral