[berns]

XML is very simple. Maybe YAML is simpler but both are very simple. XML is tedious to write, verbose and repetitive, but not complicated nor complex. XSLT is also conceptually very simple. XML, XML schema tools and XSLT make a very powerful combination that has proven to be useful in a myriad of real world problems.

[TazeTSchnitzel]

If only XML were actually as simple as you claim. If only there weren't a myriad of namespace, encoding, character literal substitution and other complexities.