code: public byte[] getAC() {
  
      Element acElement = (Element) xmlResponse.getElementsByTagName("ac")
        .item(0);
  
      byte[] ac = VOMSBase64Decoder.decode(acElement.getFirstChild()
        .getNodeValue());
  
      if (ac == null)
        ac = new GoodACDecodingStrategy().decode(acElement.getFirstChild()
          .getNodeValue());
  
      return ac;
    }
docs: /*
  (non-Javadoc)
  
  @see org.glite.voms.contact.VOMSResponseIF#getAC()