メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6062500 28.4750000, 129.6125000 28.4750000, 129.6125000 28.4791667, 129.6062500 28.4791667, 129.6062500 28.4750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral