メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.393249012984 44.1760234620429, 142.393968662899 44.1761375304308, 142.393738144657 44.1769328716188, 142.392991087372 44.1768168486327, 142.392110268088 44.1766728433081, 142.392367551216 44.1758759780036, 142.393249012984 44.1760234620429)) ^^http://www.opengis.net/ont/geosparql#wktLiteral