メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9312500 33.2708334, 129.9375000 33.2708334, 129.9375000 33.2750000, 129.9312500 33.2750000, 129.9312500 33.2708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral