メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6125000 32.3333333, 131.6187500 32.3333333, 131.6187500 32.3375000, 131.6125000 32.3375000, 131.6125000 32.3333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral