{
  B => {
         "-chapters" => 2,
         "-items" => 6,
         "-sections" => 3,
         "001" => {
               "01" => { "01" => 2, "02" => 1 },
               "02" => { "01" => 3, "02" => 4, "03" => 5 },
             },
         "002" => { "01" => { "01" => 0 } },
       },
}