While, mostly working in client development, I'm a professional developer of 12 years, and while I've had my random encounter with XML, I've managed to avoid it

While, mostly working in client development, I'm a professional developer of 12 years, and while I've had my random encounter with XML, I've managed to avoid it, and do not "know" XML in any significant capacity. It's easy to forget that there is a large set of different developers. And some don't know what you may consider common knowledge. IMO, something being JSON over XML would be a significant plus in my mind.