(case_id, attachment_id)
:param attachment_id:
        :return: AttachmentContent object
:param attachment_id:
        :return: AttachmentContent object
: param attachment_id : : return : AttachmentContent object
def get_attachment_content(case_id, attachment_id):
        """
        :param attachment_id:
        :return: AttachmentContent object
        """
        raise NotImplementedError
def get_attachment_content ( case_id , attachment_id ) : raise NotImplementedError