Mr. Poncelet said "We are arguing semantics". Yes, computer language
statements have syntax requirements and properly-written statements
have semantics associated with them. The language in the JCL Reference
Manual specifically refers to the relative priority of information
provided in the program DCB vs the DD/JFCB vs the DSCB, as is attested
by the section title in the manual. The actual semantics of the OPEN
statement are more complex.
Mr. Poncelet argues that his meaning of "override" is the correct one.
I would go with the meaning of "override" in the documentation, and as
I used it. If my manager sends me an message telling me to do
something, I may (with risks) override his wishes by doing something
different, but that does not mean that I rewrote his message. The
actual semantics of OPEN are that the "DCB" attributes in the DSCB are
NOT rewritten on an OPEN for input.
Mr. Poncelet demanded a verifiable example. I provided one. Read a
member of a PDS with IDCAMS PRINT with a DD specifying
"RECFM=U,BLKSIZE=32760" This works, and does NOT update the DSCB.
Dale Miller
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