メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.344946857469 43.7658879338344, 142.343895194019 43.7661166028794, 142.344654601963 43.764714837293, 142.344848147488 43.7646472364591, 142.345344246635 43.7644767464273, 142.345985826556 43.7642435620093, 142.346829116156 43.7654786097926, 142.344946857469 43.7658879338344)) ^^http://www.opengis.net/ont/geosparql#wktLiteral