anchor.diff:  
   seller
       returns [JsonStructure e]
  -    @init          { $e = new JsonStructure("company"); }
  +    @init          { $e = new JsonStructure("seller"); }
       : entitySeller { $e.add($entitySeller.e);  }
       ( address      { $e.add($address.e); } )?
       ;
  
positive.code: 
  state
      returns [JsonElement e]
      @init { String t; }
      : CAPITAL_LETTER { t = $CAPITAL_LETTER.getText(); }
        CAPITAL_LETTER {
          t += $CAPITAL_LETTER.getText();
          $e = new JsonElement("state", t);
      }
      ;
  
  IDNUMBER
  
negative.code:     : KEYWORD_ADDRESS COLON?
        NAME          { $e.add(new JsonElement("main", $NAME.getText())); }
      (zipcode { $e.add($zipcode.e); } )?
      (
          city    { $e.add($city.e);    }
        ( state   { $e.add($state.e);   } )?
      )?
      ;
  
  zipcode
      returns [JsonElement e]
      @init { String t = ""; }
      : INT { t += $INT.getText(); }
        HIFEN?
        INT { t += $INT.getText(); }
      { $e = new JsonElement("zipcode", t); }
      ;
  
  city
  