メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.903394780929 43.4816432629745, 141.902603903944 43.4817672500242, 141.902277633184 43.4806360389198, 141.90305941889 43.480495255093, 141.903394780929 43.4816432629745)) ^^http://www.opengis.net/ont/geosparql#wktLiteral