メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.392110268088 44.1766728433081, 142.3909375158 44.1764927300466, 142.39119099839 44.1756942716318, 142.392367551216 44.1758759780036, 142.392110268088 44.1766728433081)) ^^http://www.opengis.net/ont/geosparql#wktLiteral