メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8250000 31.3458334, 130.8312500 31.3458334, 130.8312500 31.3500000, 130.8250000 31.3500000, 130.8250000 31.3458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral