Net::OAI::Error - OAI-PMH errors.
Returns an OAI error if one was encountered, or the empty string if no errors were associated with the OAI request.
For more information about these error codes see: http://www.openarchives.org/OAI/openarchivesprotocol.html#ErrorConditions.
Returns a textual description of the error that was encountered, or an empty string if there was no error associated with the OAI request.
