メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.1625000 28.0416667, 129.1687500 28.0416667, 129.1687500 28.0458334, 129.1625000 28.0458334, 129.1625000 28.0416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral