Cenvat Input Refund on Exports

Rule 6(2) states to maintain seperate account for exempted and dutiable goods... Also the language of rule 5 is as follows

"Where any inputs or input services are used in the final products which are exported or used i providing output service which is exported.........."

Now in this language it does not say that whole of the goods must be exported... So u can claim credit refund for export part... Also, you can take whole credit... But can take refund on only that part of inputs which is used  for export...