メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.36135277104 43.1095897302729, 141.361259446054 43.1099487927281, 141.361250293323 43.1099842360567, 141.359701011474 43.1097529371576, 141.35981688121 43.1093292820762, 141.360572541946 43.1094327599441, 141.361370627689 43.1095431725389, 141.36135277104 43.1095897302729)) ^^http://www.opengis.net/ont/geosparql#wktLiteral