@abc.abstractmethod<EOL><INDENT>def get_next_coordinates(self, n):<DEDENT>
return<EOL>
Gets the next set of ``Coordinate`` elements in this list.

        The specified amount must be less than or equal to the return
        from ``available()``.

        :param n: the number of ``Coordinate`` elements requested which must be less than or equal to ``available()``
        :type n: ``cardinal``
        :return: an array of ``Coordinate`` elements.The length of the array is less than or equal to the number specified.
        :rtype: ``osid.mapping.Coordinate``
        :raise: ``IllegalState`` -- no more elements available in this list
        :raise: ``OperationFailed`` -- unable to complete request

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