メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.0937500 43.6458334, 144.1000000 43.6458334, 144.1000000 43.6500000, 144.0937500 43.6500000, 144.0937500 43.6458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral