@abc.abstractmethod<EOL><INDENT>def can_delete_books(self):<DEDENT>
return<EOL>
Tests if this user can delete ``Books`` A return of true does not guarantee successful authorization.

        A return of false indicates that it is known deleting a ``Book``
        will result in a ``PermissionDenied``. This is intended as a
        hint to an application that may not wish to offer delete
        operations to unauthorized users.

        :return: ``false`` if ``Book`` deletion is not authorized, ``true`` otherwise
        :rtype: ``boolean``


        *compliance: mandatory -- This method must be implemented.*