メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0937500 33.5875000, 131.1000000 33.5875000, 131.1000000 33.5916667, 131.0937500 33.5916667, 131.0937500 33.5875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral