public DocumentListAclFeedLink getAclFeedLink() {
   List<DocumentListAclFeedLink> links = getRepeatingExtension(DocumentListAclFeedLink.class);
   for (DocumentListAclFeedLink feedLink : links) {
     if (AclNamespace.LINK_REL_ACCESS_CONTROL_LIST.equals(feedLink.getRel())) {
       return feedLink;
     }
   }
   return null;
 }
 public AclFeed getAclFeed() {
   DocumentListAclFeedLink feedLink = getAclFeedLink();
   return (feedLink != null) ? feedLink.getFeed() : null;
 }