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      The central component of the library is the basic_ptree
      class template. Instances of this class are property trees. It is parametrized
      on key and data type, and key comparison policy; ptree,
      wptree, iptree and wiptree
      are typedefs of basic_ptree
      using predefined combinations of template parameters. Property tree is basically
      a somewhat simplified standard container (the closest being std::list), plus
      a bunch of extra member functions. These functions allow easy and effective
      access to the data stored in property tree. They are various variants of get, put, get_value,
      put_value,
      get_child,
      put_child.
      Additionally, there is a data
      function to access node data directly.
    
      See the basic_ptree class
      template synopsis for more information.