In the D&D group I play with one of the players insists that when you reach a new level you have to zero your experience. However when I checked the PHB1 there is no reference to this. PHB1 uses the term Total Experience when talking about leveling up.
Does the RAW rules say you should use your total XP gained for the character, or zero it at each level?
Understandably zeroing your XP would allow for a longer campaign.