メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.6187500 31.7666667, 130.6250000 31.7666667, 130.6250000 31.7708334, 130.6187500 31.7708334, 130.6187500 31.7666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral