Paul Gilmartin wrote, in part, in answer to "Why can't a data set name element 
start with a digit":
>Left-to-right lexical analyzer that treats anything beginning with a digit
>as a number.

I'm willing to believe this, but am unclear on why whatever is parsing a DSN 
would care whether it's a number or not. E.g.:
//SYSIN            DD       DISP=SHR,DSN=1.2.3

Why would it care that it's a digit? The start of a non-initial DSN element is 
the thing after a period, so it doesn't matter there.

 

My guess is something planned/considered that never happened, or just a mistake 
late on a Sunday afternoon in 1962.


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