The problem is not that XML isn't "trendy". It's annoying to use, especially in an environment where JSON is a first-class citizen. JSON-schema is a thing as w

The problem is not that XML isn't "trendy". It's annoying to use, especially in an environment where JSON is a first-class citizen. JSON-schema is a thing as well, maybe not quite as mature (or "aged"), but the tooling is fine.