メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5187500 32.3250000, 131.5250000 32.3250000, 131.5250000 32.3291667, 131.5187500 32.3291667, 131.5187500 32.3250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral