メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3312500 28.1375000, 129.3375000 28.1375000, 129.3375000 28.1416667, 129.3312500 28.1416667, 129.3312500 28.1375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral