メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8250000 33.1375000, 129.8312500 33.1375000, 129.8312500 33.1416667, 129.8250000 33.1416667, 129.8250000 33.1375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral