メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.3125000 31.6750000, 130.3187500 31.6750000, 130.3187500 31.6791667, 130.3125000 31.6791667, 130.3125000 31.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral