メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.346269109862 44.4871146072681, 142.345772054307 44.4869777740134, 142.346021304383 44.4865349133975, 142.346511553181 44.4866428171004, 142.346269109862 44.4871146072681)) ^^http://www.opengis.net/ont/geosparql#wktLiteral