def METHOD_NAME(self, skel: SkeletonInstance):
    """
    Prepares values of one :class:`viur.core.skeleton.Skeleton` or a list of skeletons for output.
    :param skel: Skeleton which contents will be processed.
    :returns: A dictionary or list of dictionaries.
    :rtype: dict
    """
    if skel is None:
        return None
    elif isinstance(skel, dict):
        return skel
    res = {}
    for key, bone in skel.items():
        res[key] = self.renderBoneValue(bone, skel, key)
    return res