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I'm curious, I've been developing pretty powerful websites/web apps, and I've never learned XML, even odder I've never really felt the need to. It's not like curl or Prepared Statements where, before knowing what they did and how they worked, I had a feeling 'there's got to be an easier way to do this!' or 'there's got to be something designed for this!'.
Currently I work with MySQL and JSON and I don't have this feeling of 'I need to learn that' (XML), this must be wrong!
I'm really interested to hear some compelling arguments for XML, and learn about things which it can do beter than JSON or MySQL (or some other aspect of web dev) and when i should be using it!