メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.330617277968 43.0687759413276, 141.329067254363 43.0685666816488, 141.329355681597 43.0674217968244, 141.330138631252 43.0675366177245, 141.330914373762 43.067639631214, 141.330741366465 43.0683232464124, 141.330617277968 43.0687759413276)) ^^http://www.opengis.net/ont/geosparql#wktLiteral