メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3250000 36.3375000, 140.3312500 36.3375000, 140.3312500 36.3416667, 140.3250000 36.3416667, 140.3250000 36.3375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral