メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6812500 32.9041667, 129.6875000 32.9041667, 129.6875000 32.9083333, 129.6812500 32.9083333, 129.6812500 32.9041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral