メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.383794281947 42.9837840395829, 144.38138013279 42.9833533210703, 144.381539621487 42.9828077029339, 144.381554518431 42.9827565078065, 144.383985339481 42.9831824818139, 144.383794281947 42.9837840395829)) ^^http://www.opengis.net/ont/geosparql#wktLiteral