メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3062500 28.1416667, 129.3125000 28.1416667, 129.3125000 28.1458334, 129.3062500 28.1458334, 129.3062500 28.1416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral