メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3312500 28.1458334, 129.3375000 28.1458334, 129.3375000 28.1500000, 129.3312500 28.1500000, 129.3312500 28.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral