I'm going to make an educated guess:

DCL-PR createUALog extpgm('US2000RP');
   someiNputValue  varchar(256);
   someOtherValue  char(10);
end-pr;

If you don't use a parameter label, you have to specify *N for it, which is really ugly. So I'd use labels and avoid Unnamed parameters.

FYI, here are some explanations and examples of free-format syntax:

https://www.ibm.com/developerworks/ibmi/library/i-ibmi-rpg-support/

VARYING was changed to VARCHAR huh? I suppose to attract and appease the younger talent. 

Actually, that was me. I suggested that VARCHAR was better than the initial IBM suggestion. I preferred the SQL syntax that way if you do a CREATE TABLE in RPG and declare a field in RPG the VARCHAR syntax is the same.

Thanks to all who added the expertise.  I was trying to look for a good IBM example and couldnt find one.  The example supplied is exactly what I was looking for.  Thanks Bob.