メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.5250000 43.6916667, 144.5312500 43.6916667, 144.5312500 43.6958334, 144.5250000 43.6958334, 144.5250000 43.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral