メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.5875000 35.0208334, 136.5937500 35.0208334, 136.5937500 35.0250000, 136.5875000 35.0250000, 136.5875000 35.0208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral