メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.344363039991 43.0658965387244, 141.342694144547 43.0656716123694, 141.342796549173 43.0652451036287, 141.342976224005 43.0645222053826, 141.344034905112 43.0646647192381, 141.344638595834 43.0647385657168, 141.344557177699 43.0650892165077, 141.344497268085 43.0653470621831, 141.344363039991 43.0658965387244)) ^^http://www.opengis.net/ont/geosparql#wktLiteral