メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.1812500 28.2625000, 129.1875000 28.2625000, 129.1875000 28.2666667, 129.1812500 28.2666667, 129.1812500 28.2625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral