メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9750000 28.3458334, 129.9812500 28.3458334, 129.9812500 28.3500000, 129.9750000 28.3500000, 129.9750000 28.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral