メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349328937232 44.4770845433809, 142.348807428133 44.4769586796058, 142.348860807432 44.4768483813344, 142.348974838383 44.4766127319282, 142.349382727452 44.4757777163255, 142.349891972279 44.4759041859581, 142.34938020362 44.4769770943696, 142.349328937232 44.4770845433809)) ^^http://www.opengis.net/ont/geosparql#wktLiteral