メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.426929791793 43.8255165383962, 142.425590111881 43.8245560946384, 142.428568466749 43.8224120300584, 142.428918217916 43.8229745088823, 142.42937220275 43.8237137689164, 142.428047445638 43.8246902568169, 142.426929791793 43.8255165383962)) ^^http://www.opengis.net/ont/geosparql#wktLiteral