conventions / restrictions for JOB names

We have a process that is dynamically creating JOBs in XPP.
I am trying to find out the exact constrictions for a JOB name but cannot find anything in the documentation.
Can anyone point me in the right direction?

I did see a description for DIV names within the XPP User Manual:
1-64 characters: lowercase letters, the digits 0–9, the hyphen
(-), the number sign (#), the plus sign (+), and an underline
(_).

I think that JOB names can be larger than 64 characters  but am not sure what the limit is or if there are any other restrictions.

Thanks.

Paul