メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.5875000 35.4250000, 138.5937500 35.4250000, 138.5937500 35.4291667, 138.5875000 35.4291667, 138.5875000 35.4250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral