メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9875000 28.3416667, 129.9937500 28.3416667, 129.9937500 28.3458334, 129.9875000 28.3458334, 129.9875000 28.3416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral