>Do customers typically add their own SYS type symbols 

I expect not. They should not.

My point was that we could safely add a symbol starting with SYS but could 
not safely add a symbol such as &YESTERDAY due to the compatibility 
concerns that a customer might have done so and our definition could cause 
them a problem.

&SYSYESTERDAY would be OK, but of course would not be in line with the 
names of the other time/date-oriented symbols.

Peter Relson
z/OS Core Technology Design


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