Qodex.ai
This is a public workspace to help define many of the different XML standards available out there and understand what it would take to evolve them to be JSON Schema, and then evaluate how HTTP, event and message driven APIs can be defined from them using OpenAPI and AsyncAPI. Feel free to fork the collection and add any XML standard to the list with a pull request, or just leave as a comment.

XML Standards

Current list generated using XML Standard collection + visualizer: