メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.2000000 26.7416667, 128.2062500 26.7416667, 128.2062500 26.7458334, 128.2000000 26.7458334, 128.2000000 26.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral