To avoid the downvotes acknowledge that the article already declares the purpose and ask for more details. As it is you come across as not having read it, but opining negatively.

To your question - in my case I had a server returning XML/JSON output and on the client side I needed to parse the output and convert it into an object model, collect changes and ship the. Back to the server. That was a lot of boiler-plate code we ended up repeating in java, C#, javascript, and C++. We used C++ version in lieu of Objective C and it was a pain with memory management mismatch.