OpenID Reserved Characters

I play a game called A Tale in the Desert. We have a player-updated wiki that uses OpenID. The game is opening a second server. Currently, character names are used to login as the OpenID identifier. The problem is that names won't be unique between the two game servers. So, the developers of the game would like to use something like "name^server". The problem is that we need a delimiting character between "name" and "server". What special characters are allowed in an OpenID name, and which are not?
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