メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.99282864015 43.5477248912197, 144.992873752246 43.5477560496261, 144.992245651458 43.5482695152021, 144.9921248425 43.5483683298693, 144.991112085275 43.5477215531271, 144.991249572568 43.5476110531512, 144.991904255456 43.5471251174811, 144.99282864015 43.5477248912197)) ^^http://www.opengis.net/ont/geosparql#wktLiteral