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