メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((123.8250000 24.3750000, 123.8312500 24.3750000, 123.8312500 24.3791667, 123.8250000 24.3791667, 123.8250000 24.3750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral