メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.406475692723 44.1810017237836, 142.406334306236 44.1809341668075, 142.406015832405 44.1808473578543, 142.405161900006 44.1807081144186, 142.405306559762 44.1802134722724, 142.405496940106 44.1796519861959, 142.406968018503 44.1806209910003, 142.406475692723 44.1810017237836)) ^^http://www.opengis.net/ont/geosparql#wktLiteral