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Answers
RapidMiner Studio uses an abstraction layer to represent data from any source and thus create a common ground on which operators can work on. Model training usually expects a "com.rapidminer.example.ExampleSet" which is the most commonly used data format. Essentially it represents a table of data. So if you want to train most models, you probably want to create an ExampleSet and pass it to the process (containing the classifier in your case). See the FAQ for how to do this: http://rapid-i.com/rapidforum/index.php/topic,5807.msg20492.html
Regards,
Marco