メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.2062500 29.1458334, 129.2125000 29.1458334, 129.2125000 29.1500000, 129.2062500 29.1500000, 129.2062500 29.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral