メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.928255691994 43.4985275223449, 141.927141536975 43.4986942150547, 141.926938871217 43.4980168473443, 141.928349778744 43.4978016563885, 141.928546684037 43.4984840010719, 141.928255691994 43.4985275223449)) ^^http://www.opengis.net/ont/geosparql#wktLiteral