メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.772318721502 43.2000357890128, 141.772783449079 43.2002610149165, 141.772194145863 43.2008747752879, 141.772160080681 43.2009102200672, 141.771713594746 43.2006753644292, 141.771253125902 43.2004469155975, 141.771446124942 43.2002413801129, 141.771859815058 43.1998105864015, 141.772318721502 43.2000357890128)) ^^http://www.opengis.net/ont/geosparql#wktLiteral