On the flip side, XML is by far the superior choice for documents people will have to read. Paired with XSD it makes it a lot easier to created valid, well-form

On the flip side, XML is by far the superior choice for documents people will have to read. Paired with XSD it makes it a lot easier to created valid, well-formed documents that conform to expected input. Ideal for anything that isn't required to be transmitted over the wire frequently. Like config files. I feel like we could save the world thousands of hours of head-scratching if things like web server config or deployment descriptors were done in rigorously-defined XML formats instead of made-up formats like Dockerfile.