メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.381008205198 43.7668944771869, 142.381326455156 43.76744798732, 142.379808729412 43.7679058077208, 142.379468564659 43.7673377975779, 142.379159802886 43.7667656712108, 142.380679312284 43.7663365830374, 142.381008205198 43.7668944771869)) ^^http://www.opengis.net/ont/geosparql#wktLiteral