anchor.diff:    String              get UUID  => this._fields['Unique-ID'];
     String              get state => this._fields['Channel-State'];
     
  +  /**
  +   * Extracts the relevant information from the packet and stores 
  +   * it in an internal map.
  +   */
     Channel.fromPacket (Packet packet) {
       packet.contentAsMap.forEach((key, value) {
         if (key.contains("^variable_")) {
  
positive.code: part of esl;
  
  abstract class ChannelState {
    static const String NEW = "CS_NEW";
    static const String INIT = "CS_INIT";
  
negative.code:   static const String DESTROY = "CS_DESTROY";
  }
  
  /**
   * Wrapper class for a channel. Provides easy access to various
   * channel information stored in a packet. 
   */
  class Channel {
    
    static const String nullChannelID = null; 
  