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For example, the data structure below represents a nested product category tree structure. 
{ 
  "identifier": 1, 
  "categories": [ 
    { 
      "identifier": 2, 
      "categories": [ 
        { 
          "identifier": 3 
        } 
      ] 
    } 
  ] 
}
By using the “Flatten nested structure” transformer it can be flatten into a single array. 
[ 
  { 
    "identifier": 1 
  }, 
  { 
    "identifier": 2 
  }, 
  { 
    "identifier": 3 
  } 
]

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Fields

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ChildPath

The path within the data of the structure to flatten.