メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.429902698531 43.7931385524536, 142.43043438525 43.7934660778039, 142.430938423444 43.7937856625991, 142.43147528428 43.7941317556182, 142.430077634958 43.7952345853114, 142.429534964751 43.7949310979077, 142.429025381257 43.7946035264365, 142.428524130982 43.7942859412804, 142.428026545132 43.7939674146465, 142.428012112967 43.7939581718375, 142.429357274485 43.7928370469967, 142.429902698531 43.7931385524536)) ^^http://www.opengis.net/ont/geosparql#wktLiteral