@abc.abstractmethod<EOL><INDENT>def set_items_sequential(self, sequential):<DEDENT>
pass<EOL>
Sets the items sequential flag.

        :param sequential: ``true`` if the items are taken sequentially, ``false`` if the items can be skipped and revisited
        :type sequential: ``boolean``
        :raise: ``InvalidArgument`` -- ``sequential`` is invalid
        :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``

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