メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.0250000 33.1708334, 129.0312500 33.1708334, 129.0312500 33.1750000, 129.0250000 33.1750000, 129.0250000 33.1708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral