メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6812500 33.2416667, 131.6875000 33.2416667, 131.6875000 33.2458334, 131.6812500 33.2458334, 131.6812500 33.2416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral