メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8312500 32.6208334, 129.8375000 32.6208334, 129.8375000 32.6250000, 129.8312500 32.6250000, 129.8312500 32.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral