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• [Validator] Add Yaml constraint for validating YAML content #53749

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Yaml constraint was merged, so please rebase

I've made the following changes:

• Removed format abstraction
• Removed the Yaml constraint from this PR since it has already been merged
• Reverted the Json constraint changes to prevent breaking the translation
• Remove the Jwt constraint for now, as verifying the signature requires extensive work. I will likely push a separate PR for it later.
• Adjusted the Xml constraint to support only the modern method of defining constraints

Asserting that a file is XML is pretty weak as a check: one always expectes some structure in the XML. It'd be natural to me to allow passing an XSD, isn't it? Up to improve the PR in this direction?

@nicolas-grekas Thank you for your feedback. The constraint is intended to assert a string value rather than a file.
I'm not sure about allowing XSD checks, but I will consider supporting it if we receive more positive feedback either before or after merging the PR

Any updates?

Asserting that a file is XML is pretty weak as a check: one always expectes some structure in the XML. It'd be natural to me to allow passing an XSD, isn't it? Up to improve the PR in this direction?

@nicolas-grekas Thank you for your feedback. The constraint is intended to assert a string value rather than a file. I'm not sure about allowing XSD checks, but I will consider supporting it if we receive more positive feedback either before or after merging the PR

I also think that supporting validating the XML content against a schema would make this feature more useful.

@nicolas-grekas Yes, I'll work on it when I have some free time.

@nicolas-grekas & @fabpot: Thanks again for the feedback. XSD schema validation is now supported.