From "Fallacies of Validation, version #3" by Roger L. Costello:
5. Fallacy of a Universal Validation Language
Dave Pawson identified this fallacy. He noted that the Atom specification
cannot be validated using a single technology:
> From [Atom, version] 0.3 onwards it's not been possible
> to validate an instance against a single schema, not
> even Relax NG. They need a mix of Schema and 'other'
> processing before being given a clean bill of health.
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