メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4812500 31.5083333, 130.4875000 31.5083333, 130.4875000 31.5125000, 130.4812500 31.5125000, 130.4812500 31.5083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral