メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.0312500 35.0708334, 135.0375000 35.0708334, 135.0375000 35.0750000, 135.0312500 35.0750000, 135.0312500 35.0708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral