メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9875000 30.7375000, 130.9937500 30.7375000, 130.9937500 30.7416667, 130.9875000 30.7416667, 130.9875000 30.7375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral