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The thematic catalogs have an external representation that allow easy
transportation of their content. The format used is XML. The file
containing the XML representation of a catalog is named with the .rdf
extension. When the XML/RDF conventions will be better supported the
catalogs will eventually use these conventions, hence the extension.
You should not invest too much on the current XML format because
it is likely to change drastically in the next few monthes. Nevertheless,
we've found very convinient to have a text representation of the catalogs,
specially for importing data from various sources.
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