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Warnings can be reported for a lot of reasons. Sometimes they point out that, while valid in a technical sense, the result won't be optimal, or the validator can't determine if a construct was used intentional or in error, and stuff like that. Futhermore, it depends of the version of the validator and if warnings are on or off, and it makes sense if a distributor has its own checking procedure, which doesn't focus on technical validity, but on checking if the content is complete, plausible and fits their requirements.
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