As someone who a) personally had to deal with XML fallout, and b) actually looked into its history, I respectfully disagree. I adore typed semi-structured data,

As someone who a) personally had to deal with XML fallout, and b) actually looked into its history, I respectfully disagree. I adore typed semi-structured data, but XML is not an implementation thereof that is appropriate for, at least, nowadays (I go into just slightly more detail in a sibling comment).