question mark in special charset

[acubens]

Maybe a stupid question: I am trying to use a custom charset in oclhc which contains the question mark '?' (like this: -1 '?u?l?d!§$%&?'). But I can't find an escape character so that it is not taken as the token of a predefined charset, and oclhc throws a syntax error. Is there an escape char (backslash doesn't work)?

Thanks
-J