The warrior-within tag was just created, and used in conjunction with the prince-of-persia tag. While the Warrior Within "subtitle" is unique to my knowledge, and fairly well-known, do we have a general rule for this? Obviously prince-of-persia-warrior-within is too long, but what about pop-warrior-within? (PoP is a well known acronym among my gamer friends, not sure if it's well known enough.)
Should we always use the main title in conjunction with the subtitle (whether in two tags or in one)? Are there rules for making short forms?