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.

Mar 23, 2018 ยท 4:15 PM UTC

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As a followup, JSON is rarely the right answer unless you're a nice RESTful API being exposed to a JavaScript application running in a browser.
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If you expect a human to interact with the content in any way, please use something less awful such as YAML, or a DSL for your particular use-case. In general, YAML.
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And *whatever* you end up using, for goodness sake ensure you have competent, pervasive, well-written diagnostics which point *exactly* at where something bad came from.