It's been a pastime of mine to compare XML and JSON, as a mature, expressive and self-descriptive format against one that is ambiguous and unextensible. As many of you should realize by now, this comparison is actually quite meaningless ‒ these two formats have a vastly different focus and primary area of use ‒ XML is focused on documents (apparent for example in situations where formatting may be relevant), while JSON is focused on representing commonly-used structures in programming languages (well, only those in JavaScript) and nothing more and nothing less. There are however usage areas where these two formats overlap, and that is when describing entities or objects of various kinds, linked together using properties. In other words, linked data.
