メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8625000 29.8458334, 129.8687500 29.8458334, 129.8687500 29.8500000, 129.8625000 29.8500000, 129.8625000 29.8458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral