メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.9065488712 43.5123204112057, 141.906013805226 43.5124179973523, 141.905549651157 43.5106834432138, 141.905996160663 43.5106131964447, 141.906066299076 43.5106021904861, 141.9065488712 43.5123204112057)) ^^http://www.opengis.net/ont/geosparql#wktLiteral