Core | XML coding example (1/4)

Assume population data for cities in the world, organized hierarchically: continent, country, province, city:

Europe
   France
      Alpes Maritimes
         Antibes: 65000
         Nice: 350000 ...
      Var
         Toulon: 170000 ...
   Germany
      Pfaltz
         Heidelberg: 50000 ...
Africa ...