メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.110537245118 43.8263348603666, 144.108926661888 43.8268297960939, 144.108904533705 43.8267928692058, 144.108068039341 43.8254095169357, 144.109420829854 43.824983801619, 144.109459113242 43.8249717693742, 144.110518774617 43.8263155600763, 144.110537245118 43.8263348603666)) ^^http://www.opengis.net/ont/geosparql#wktLiteral