anchor.diff:  -type time()         :: erlang_timestamp() | non_neg_integer().
   -type logger()       :: io_format                       %% | ctpal
                         | {log_collector, comm:mypid()}.
  --type pidinfo()      :: {comm:mypid(), 
  +-type pidinfo()      :: {comm:mypid(),
                            {pid_groups:groupname(), pid_groups:pidname()} |
  -                             no_pid_name | 
  +                             no_pid_name |
                                non_local_pid_name_unknown}.
   -type anypid()       :: pid() | comm:mypid() | pidinfo().
   -type trace_id()     :: atom().
  
positive.code: 
      EndTime =  element(2, lists:last(DrawTrace)),
  
      %% draw nodes and timelines
      _ = lists:foldl(
            fun(X, Acc) ->
  
negative.code: % @copyright 2012-2013 Zuse Institute Berlin
  
  %   Licensed under the Apache License, Version 2.0 (the "License");
  %   you may not use this file except in compliance with the License.
  