Net::OAI::ListRecords - Results of the ListRecords OAI-PMH verb.
You probably don't want to be using this method yourself, since Net::OAI::Harvester::listRecords() calls it for you.
Return the next metadata or record object or undef if there are no more.
metadataHandler() =head2 recordHandler()
Returns the name of the package being used to represent the individual metadata records. If unspecified it defaults to Net::OAI::Record::OAI_DC which should be ok.