メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3187500 32.9291667, 131.3250000 32.9291667, 131.3250000 32.9333333, 131.3187500 32.9333333, 131.3187500 32.9291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral