メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.7187500 33.1833333, 131.7250000 33.1833333, 131.7250000 33.1875000, 131.7187500 33.1875000, 131.7187500 33.1833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral