def get_summary_of_old_data(old_data):
    """Return a string summarizing the OLD resources that will be created.

    """

    summary = [u'\nOLD resources to be created.']
    for resource_name in sorted(old_data.keys()):
        resource_list = old_data[resource_name]
        summary.append(u'  %s: %d' % (resource_name, len(resource_list)))
    return u'\n'.join(summary)