メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.6312500 43.5041667, 144.6375000 43.5041667, 144.6375000 43.5083333, 144.6312500 43.5083333, 144.6312500 43.5041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral