メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.5125000 31.4625000, 130.5187500 31.4625000, 130.5187500 31.4666667, 130.5125000 31.4666667, 130.5125000 31.4625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral