メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.7250000 32.6083333, 131.7312500 32.6083333, 131.7312500 32.6125000, 131.7250000 32.6125000, 131.7250000 32.6083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral