メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.875308931004 43.0088160931159, 142.874390888043 43.0096080820587, 142.874244978536 43.0095274356392, 142.872835687058 43.0086581611025, 142.873082264837 43.0084689713784, 142.873187871352 43.0083552374752, 142.873398327878 43.0080582172882, 142.873587549346 43.0077507625084, 142.875308931004 43.0088160931159)) ^^http://www.opengis.net/ont/geosparql#wktLiteral