{
   "test:bookstore":{
      "categories":[
         {
            "name":"web",
            "books":[
               {
                  "authors":[
                     "Toine Siebelink","David Lang"
                  ],
                  "lang":"en",
                  "price":"123456",
                  "pub_year":"2020",
                  "title":"My first book"
               }
            ]
         },
         {
            "name":"art",
            "books":[
               {
                  "authors":[
                     "Test"
                  ],
                  "lang":"en",
                  "price":"1234",
                  "pub_year":"2020",
                  "title":"My 2nd book"
               }
            ]
         }
      ]
   }
}