@Override
 public String getAuthorName() {
   FeedElement element = getElement(NAME);
   return element == null ? null : element.getContentString();
 }
 @Override
 public String getAuthorUri() {
   FeedElement element = getElement(URI);
   return element == null ? null : element.getContentString();
 }
 @Override
 public String getEmail() {
   FeedElement element = getElement(EMAIL);
   return element == null ? null : element.getContentString();
 }