メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.9437500 43.8458334, 143.9500000 43.8458334, 143.9500000 43.8500000, 143.9437500 43.8500000, 143.9437500 43.8458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral