def METHOD_NAME(self, value, instance, errors={}, **kwargs):
    """
    Validate passed-in value using all subfield validators.
    Return None if all validations pass; otherwise, return failed
    result returned by validator
    """
    name = self.getName()
    if errors and name in errors:
        return True
    validation_results = (
        RecordField.METHOD_NAME(
            self,
            record,
            instance,
            errors={},
            **kwargs
            )
        for record
        in value
    )
    return next((
        result
        for result
        in validation_results
        if result is not None
    ), None)