メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.91490473242 43.5179755059799, 141.914849736499 43.5177824060474, 141.914619212795 43.5169729481531, 141.914415302479 43.516256855698, 141.916312398853 43.5159814852104, 141.91637622775 43.516220286466, 141.916777594719 43.5175611963361, 141.916823098744 43.5177112977956, 141.91490473242 43.5179755059799)) ^^http://www.opengis.net/ont/geosparql#wktLiteral