メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.902603903944 43.4817672500242, 141.90186501045 43.4818612544876, 141.901524331393 43.4807396318604, 141.901521654097 43.4807308337079, 141.902271171445 43.4806136207612, 141.902277633184 43.4806360389198, 141.902603903944 43.4817672500242)) ^^http://www.opengis.net/ont/geosparql#wktLiteral