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Hi Barbara <snip> > There's no confusion. PREFIX('PT.') is supported on F specs, to allow > you to have your file use the subfields of a qualified data structure. > Your file fields and your D spec fields aren't separate; the I-specs > (program described or compiler-generated) just say to move the buffer > contents to the named field. (The compiler _will_ generate a definition > from the I spec, but only if the field isn't already defined in D > specs.) </snip> >From what I understand, if you define a DS using LIKEREC or an external DS based on a file format, then you do input (READ, CHAIN,etc.) from the file using the DS, there is a speed advantage, because the read plunks down the entire record over your DS, and each field of data doesn't have to be moved to the 'file' fields. Does this speed advantage work if you follow the methodology you mention, in using a prefix with a dot specified at the end ('PT.').
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