メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.746317506739 43.2020667759942, 141.746793799968 43.2022960997178, 141.746053790034 43.2030671575294, 141.745424165866 43.2037230101743, 141.744936785976 43.2034797800774, 141.744512867984 43.2032587708625, 141.745123543635 43.2026162724995, 141.745136925656 43.2026022658299, 141.745866374235 43.2018355946282, 141.746317506739 43.2020667759942)) ^^http://www.opengis.net/ont/geosparql#wktLiteral