Sure, if you define and use it. Same as yaml schemas (they exist!).
XML has them sorta built in (basically all (notable) libraries support them), but it's not like it's required or somehow innately protected because of that. It's just a bit easier to adopt.
But my case was with a yaml validated to a schema. A kube ingress file with a list of rules. My additional dash made it a new entry, in practice allowing everything. With xml it would have been very explicit that I now accidentally had made two rules.
I believe XML has it baked directly into the official spec. JSONSchema is great, but I wouldn't call it a standard yet, and anecdotally I haven't seen it as often as I'd like in use (i.e. I either need to run kubectl --dry-run or use a separate third party solution to validate my changed yaml).
