メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5875000 33.4208334, 131.5937500 33.4208334, 131.5937500 33.4250000, 131.5875000 33.4250000, 131.5875000 33.4208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral