メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.575545626624 43.3290630305707, 145.575008402361 43.3294701270681, 145.57448778637 43.3298639397361, 145.573421277844 43.3290673728968, 145.573938700564 43.3286714779305, 145.574445502776 43.3282929066026, 145.575545626624 43.3290630305707)) ^^http://www.opengis.net/ont/geosparql#wktLiteral