[bastawhiz]

>XML is not popular because of JavaScript developers.

This could not be more false. JavaScript is built around the DOM. You can parse XML with DOMParser and query it with the same interfaces that you build your UI with. The X in AJAX is XML. The "good native representation" of XML in JavaScript is the very core data structure that JavaScript was designed to interact with.

XML is not popular because it's complex. Escaping is hard. XML bombs make it unusable in its raw form.

Fundamentally, XML doesn't give you data structures that look like the ones you use in your application logic. You have to transform your data into something that makes sense in XML, then transform it back. With JSON (and other formats) the data structures that you're given are present in almost every programming language. You don't need to model your data differently for transit or storage than you do in your application logic.

[oaiey]

Good arguments but using DOM Api in JavaScript needs many more lines than JSON parsing and access. jQuery made HTML access bearable for a simple reason: DOM sucks :)

Average Joe Dev does not reach the impedance mismatch you mention correctly.

[bastawhiz]

The DOM interface is roughly the same in almost every language. The JSON interface is almost always simpler. It's no mystery why JSON is more popular. XML never died because of JavaScript developers.