メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906017745613 43.4749692454541, 141.906325018418 43.4759895524224, 141.905866421917 43.4760608255482, 141.905841435489 43.4760650399755, 141.90546053096 43.4761229013139, 141.905168300086 43.4751005633318, 141.904901105 43.4741217590389, 141.90573696487 43.4739958536586, 141.906017745613 43.4749692454541)) ^^http://www.opengis.net/ont/geosparql#wktLiteral