def applyData(obj, **data):
    """Save form data to an object.

        This returns a dictionary with interfaces as keys and lists of
        field names as values to indicate which fields in which
        schemas had to be changed in order to save the data.  In case
        the method works in update mode (e.g. on EditForms) and
        doesn't have to update an object, the dictionary is empty.
        """
