XML files have a tree structure. A katamorphism on a tree, often called a fold in functional programming, is simply a function which recurses through the tree a

XML files have a tree structure. A katamorphism on a tree, often called a fold in functional programming, is simply a function which recurses through the tree and flattens its data into a single summary. I can't share the details of the program with you, but hopefully this helps. Wikipedia has more information and an example at [0]. [0] https://en.wikipedia.org/wiki/Catamorphism#Tree_fold https://en.wikipedia.org/wiki/Catamorphism#Tree_fold