On Sat, 7 Oct 2023 09:41:56 -0700, Ed Jaffe wrote:

>On 9/20/2023 8:23 AM, Farley, Peter wrote:
>> ... JCL symbols as part of the definition of other JCL symbols works 
>> flawlessly every time. 
>
Is this true alike for substitution both in the name (left of the "=")
and in the value (right of the "=")?

In 
<https://www.ibm.com/docs/en/zos/3.1.0?topic=symbols-determining-equivalent-jcl>
    Substitute all symbols.
        ...
    Symbols on JCL records are treated as if they resolved simultaneously.

Peter Relson (IIRC) answered my question hers that near midnight &DATE
and &TIME might be resolved at a time when their values are inconsistent.
This requires some explanation of "simultaneously".  There ought to be
a lock to prevent this.  (REXX does it right.)

And some explanation of the effect of resolving a symbol changing the
content of column 72 from blank to non-blank or vice-versa.


>Agreed 100%. We use that feature all the time for in-house JCL and also
>for distributed product JCL.
>
>This seems like a golden opportunity to test the IBM Documentation
>Feedback process.
>
>Give it a try and let us know if you actually get a response...
>
Yes.

-- 
gil

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