module b {
  namespace "urn:a";
  prefix b;

  organization "ETSI";
  contact "my@mail.com";

  description
    "Something";
  revision 2020-01-20 {
    description "ciao";
     reference "EVC Ethernet Services Definitions YANG Modules
                              (MEF XX), TBD";
  }

  /*
   * Typedefs
   *   with indented line
   */

  typedef foo {
    // what?
    type string;
    description "ciao";
  }

  // bar

  typedef bar {

    /* version
       1
    */
    /* version
         2
    */
    /* version
     3
    */
    /* version
     4 */
    type int32;
    description "lol";
  }

  /* single line */

  container x {
    // the container is y
    description "ok";
    container y {
      description "ok";
    }
    container bar {
      description "ok";
    }
  }

}