メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.90804765888 43.4945720994225, 141.90721616149 43.4947061530404, 141.906909788094 43.4936591657656, 141.907754995931 43.4935449862441, 141.907818327586 43.4937515485358, 141.90804765888 43.4945720994225)) ^^http://www.opengis.net/ont/geosparql#wktLiteral