Mainframe, MVS and zOS Discussion

Hi,

What exactly do refer to as "Implicit Redefine"? Can anybody plaease explain it to me. Why do we really need it when we have a seperate REDEFINE (is it explicit?) clause in COBOL?

When you code multiple 01 levels in an FD, each of them is referring to the same memory location (the buffer for that file). Hence the second, and subsequent, 01 levels implicitly redefine the first 01. This does not replace the REDEFINES verb.

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