メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906703889499 43.4899805844007, 141.906658910811 43.4899876234067, 141.906476587794 43.4893907100635, 141.907441251789 43.4892270587812, 141.907614575998 43.4897817134578, 141.907631343238 43.4898353871397, 141.906703889499 43.4899805844007)) ^^http://www.opengis.net/ont/geosparql#wktLiteral