def _set_defaults(d):
    """Adds the default values to the specified dictionary if they don't already
    exist. This includes all the parameters necessary to construct the templates
    for the classes.

    .. note:: This mutates the given dictionary if some of the keys are missing.
    """
    d.setdefault('title', 'No schema information available.')
    d.setdefault('inclusion', 'unknown')
    d.setdefault('status', 'unknown')
    d.setdefault('description', 'No description was returned from AFLUX.')
    d.setdefault('type')
