> JsonSchema is pretty good -- it is not as widely used as XSD, but it has libraries for most languages. It's okay now that the newest revisions support more r

> JsonSchema is pretty good -- it is not as widely used as XSD, but it has libraries for most languages. It's okay now that the newest revisions support more realistic use cases, but ironically I find it impossible to write as JSON... I write them as YAML which my validator supports natively :) It's still not as nice as RELAX-NG's compact schema format though IMO :) https://relaxng.org/compact-tutorial-20030326.html https://relaxng.org/compact-tutorial-20030326.html And the LXML library for Python was a pleasure to use compared to any other similar library I've used.