def get_shared_content_cache_key_ptr(site_id, slug, language_code):
    """
    Get the rendering cache key for a sharedcontent block.

    This key is an indirection for the actual cache key,
    which is based on the object ID and parent ID.
    """
    return 'sharedcontent_key.{0}.{1}.{2}'.format(site_id, slug, language_code)
