メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9625000 28.2833333, 129.9687500 28.2833333, 129.9687500 28.2875000, 129.9625000 28.2875000, 129.9625000 28.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral