anchor.diff:  :author: Andres Almiray
   :version: 0.1.0
   
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positive.code: example say there exists the following `Calculator` service interface
  
  [source,java]
  ----
  package com.acme;
  
  
negative.code: A basic implementation of such service may be as follows
  
  [source,java]
  [subs="verbatim,attributes"]
  ----
  package com.acme;
  
  