メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6812500 33.7583333, 129.6875000 33.7583333, 129.6875000 33.7625000, 129.6812500 33.7625000, 129.6812500 33.7583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral