メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3687500 28.2583333, 129.3750000 28.2583333, 129.3750000 28.2625000, 129.3687500 28.2625000, 129.3687500 28.2583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral