メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8187500 33.1458334, 131.8250000 33.1458334, 131.8250000 33.1500000, 131.8187500 33.1500000, 131.8187500 33.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral