anchor.diff:  So, if you want to use cross reference links, you have to give every section an unique id and then use that id to link to it.
   
   .Cross reference usage example
  -[listing]
  ---
  +----
   [[unique_id]]
   My fabulous section
  --------------------
  +~~~~~~~~~~~~~~~~~~~
   Nel mezzo del cammin di nostra vita +
   mi ritrovai per una selva oscura, +
   ché la diritta via era smarrita.
  
positive.code: 
  Available levels are:
  
  [cols="s,",options="autowidth",frame="topbot"]
  |====
  |1|Section level 1
  |2|Section level 2
  
negative.code:  ...
  
  Uh-oh! I want to link to that fabulous <<unique_id,section>>!
  ----
  
  Options
  -------
  