メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.350928796564 44.4800482274876, 142.35022539852 44.4798630833236, 142.350689946384 44.4789000209436, 142.351442363449 44.4790621248995, 142.351215414423 44.4795807101474, 142.350928796564 44.4800482274876)) ^^http://www.opengis.net/ont/geosparql#wktLiteral