メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4375000 31.6083333, 130.4437500 31.6083333, 130.4437500 31.6125000, 130.4375000 31.6125000, 130.4375000 31.6083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral