メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.759084318217 43.1954501728678, 141.758456213939 43.1961307177439, 141.757484453152 43.1956495073832, 141.757505574106 43.1956228729941, 141.758117938784 43.194975811968, 141.758137006552 43.1949834186211, 141.758855097718 43.1942698543251, 141.759759324998 43.1947377584044, 141.759084318217 43.1954501728678)) ^^http://www.opengis.net/ont/geosparql#wktLiteral