table to the font.

        Args:
            axes (list): See below.
            instances (list): See below.

        ``axes`` should be a list of axes, with each axis either supplied as
        a py:class:`.designspaceLib.AxisDescriptor` object, or a tuple in the
        format ```tupletag, minValue, defaultValue, maxValue, name``.
        The ``name`` is either a string, or a dict, mapping language codes
        to strings, to allow localized name table entries.

        ```instances`` should be a list of instances, with each instance either
        supplied as a py:class:`.designspaceLib.InstanceDescriptor` object, or a
        dict with keys ``location`` (mapping of axis tags to float values),
        ``stylename`` and (optionally) ``postscriptfontname``.
        The ``stylename`` is either a string, or a dict, mapping language codes
        to strings, to allow localized name table entries.
        N)