メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.926370286944 43.5565176253902, 141.926344334227 43.5565245489205, 141.925473019382 43.5546838897095, 141.927735155181 43.5540878745082, 141.932592130421 43.5528805209434, 141.932936204813 43.5529276416389, 141.9337378727 43.5546378927655, 141.929703492814 43.5556672793371, 141.92900289762 43.5558460168869, 141.926370286944 43.5565176253902)) ^^http://www.opengis.net/ont/geosparql#wktLiteral