メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.5875000 28.4625000, 129.5937500 28.4625000, 129.5937500 28.4666667, 129.5875000 28.4666667, 129.5875000 28.4625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral