It is this method's job to save any data to the underlying database, as necessary, and return error messages (if any) which can then be processed by the doPostProcessing() method.
NOTE: If this step is a non-interactive step (i.e. requires no UI), then it should perform *all* of its processing in this method! @param context current DSpace context @param request current servlet request object @param response current servlet response object @param subInfo submission info object @return Status or error flag which will be processed bydoPostProcessing() below! (if STATUS_COMPLETE or 0 is returned, no errors occurred!)
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