メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.051187521353 42.9120910797083, 143.05197792682 42.9121409016981, 143.051799207983 42.9132563558873, 143.05104090374 42.913211442931, 143.050289187373 42.9131578275399, 143.050432819235 42.9120424810717, 143.051187521353 42.9120910797083)) ^^http://www.opengis.net/ont/geosparql#wktLiteral