メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349956049049 44.4804202680857, 142.349102204487 44.4801939047332, 142.349124190108 44.4801501867985, 142.349358615505 44.479684125891, 142.35022539852 44.4798630833236, 142.350003147374 44.4803228444572, 142.349956049049 44.4804202680857)) ^^http://www.opengis.net/ont/geosparql#wktLiteral