メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.290698565337 43.0713586502481, 141.290518304992 43.0712115586399, 141.289775866995 43.0706056354556, 141.290336699086 43.0703025090304, 141.291613612943 43.0696125901447, 141.292204295323 43.070083184403, 141.292511511625 43.0703384473064, 141.291615479888 43.0708530704563, 141.290698565337 43.0713586502481)) ^^http://www.opengis.net/ont/geosparql#wktLiteral