@classmethod
def printInfo(cls):
    """ Simple function (mainly for debugging) that prints basic
        information about this Domain. """
    print('Domain: %s' % cls._name)
    print('     objects: %s' % len(cls._objects))
    print('   protocols: %s' % len(cls._protocols))
    print('     viewers: %s' % len(cls._viewers))
    print('     wizards: %s' % len(cls._wizards))
