メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9750000 33.1083333, 129.9812500 33.1083333, 129.9812500 33.1125000, 129.9750000 33.1125000, 129.9750000 33.1083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral