XML is a bad idea. If you ever think "Oh I could use XML for this" then just take a step back, insert a large metal spike into your ear, extract it via the other ear, and then think again. Just say "no" to XML. It's your civic duty.
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"RESTful API with JSON" "eh?" "It's like a web service using XML, but more modern." "oh!"
"actually, the industry uses a plethora of standards, of which XML is only one. However as a whole, the world is moving away from XML due to various unpleasantnesses. Don't you want to be building future-proof systems?"
Replying to @dsilverstone @pwaring
had similar problems (working for insurance), managed to get a proper dude into the team that decides company standards and new stuff uses json now (no more SOAP/XML \o/). so yeah, even in industries where xml is the standard you can drive innovation