メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.915523725017 43.5401870473453, 141.914237498729 43.5394379935393, 141.91524541348 43.538517689305, 141.915721303816 43.5388056126573, 141.916225163628 43.5391104240252, 141.916184255375 43.539131084924, 141.916452635704 43.5392832033459, 141.915523725017 43.5401870473453)) ^^http://www.opengis.net/ont/geosparql#wktLiteral