'Set the value for the given auth level type.
@param level: string representation of an authentication level
valid for level_uri
@param alias: An optional namespace alias for the given auth
level URI. May be omitted if the alias is not
significant. The library will use a reasonable default for
widely-used auth level types.'

def setAuthLevel(self, level_uri, level, alias=None):

    self._addAuthLevelAlias(level_uri, alias)
    self.auth_levels[level_uri] = level
