REF Vs REFFLD

1) What are the differences?

2) REF / REFFLD fields attributes are changed after these keyword using files have been compiled using old attributes.
Consider this condition:
File which has REF / REFFLD will have old attr or new attr or will error occur when the file is used in the programs

REF: 1)File level Keyword.
2)Gives field descriptions from already defined Record format.
3)specify REF keyword with filename only once in the file.

REFFLD:
1)Field level keyword.
2)Gives field descriptions which are different from the referenced file
3)specify REFFLD For each field description which are different from the referenced file


I think it will have new attributes when used in programs.
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Regards,
Vanitha.