メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6812500 35.0166667, 136.6875000 35.0166667, 136.6875000 35.0208334, 136.6812500 35.0208334, 136.6812500 35.0166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral