メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908496838052 43.4897103220052, 141.907809386945 43.4898088783561, 141.907786230309 43.4897575756205, 141.907614575998 43.4897817134578, 141.907441251789 43.4892270587812, 141.908327958656 43.4890984001043, 141.908354649339 43.4891909595235, 141.908496838052 43.4897103220052)) ^^http://www.opengis.net/ont/geosparql#wktLiteral