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I am curious what use cases triggered the development of XML for example.

This roughly covers it: https://ccollins.wordpress.com/2008/03/03/a-brief-history-of... - I hadn't realised SGML was quite so old, though.

> At it’s core, XML allows a software engineer the ability to create a vocabulary, and use this vocabulary to describe data.

The lols. This is so good to read that XML allows that.