メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.995466522345 43.5505232397329, 144.994803378806 43.5510571804791, 144.99394866055 43.550502791419, 144.994619478807 43.5499718007719, 144.995466522345 43.5505232397329)) ^^http://www.opengis.net/ont/geosparql#wktLiteral