メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.312233874969 43.0172341905076, 144.311986353687 43.0180908010193, 144.310215135843 43.0178652103291, 144.308536271577 43.0176496055783, 144.307928851764 43.0175698686843, 144.307196143532 43.0174807744736, 144.306423572744 43.0173918286045, 144.306855814176 43.0158770955457, 144.308962115582 43.0161228119638, 144.310674706326 43.0163164248632, 144.312451580921 43.016494717725, 144.312233874969 43.0172341905076)) ^^http://www.opengis.net/ont/geosparql#wktLiteral