メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6812500 33.1291667, 129.6875000 33.1291667, 129.6875000 33.1333333, 129.6812500 33.1333333, 129.6812500 33.1291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral