メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6312500 32.9708334, 129.6375000 32.9708334, 129.6375000 32.9750000, 129.6312500 32.9750000, 129.6312500 32.9708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral