メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.900715923032 43.4630239763834, 141.898812692919 43.4633169164507, 141.898326845183 43.4616948457741, 141.898360549093 43.4616892527039, 141.900219023156 43.4613810992188, 141.900601190773 43.4626294614167, 141.900715923032 43.4630239763834)) ^^http://www.opengis.net/ont/geosparql#wktLiteral