メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8125000 31.3708334, 130.8187500 31.3708334, 130.8187500 31.3750000, 130.8125000 31.3750000, 130.8125000 31.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral