docs(standard): use pure ISO 3166-1 alpha-2 instead of an hybrid

[bfabio]

Deprecate the usage of lowercase ISO 3166-1 alpha-2 and allow the actual (uppercase) standard to be used.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
publiccode-yml	✅ Ready	Preview	Comment	Aug 14, 2025 6:47am

[bfabio]

If I had to guess, non-standard lowercase was used because uppercase top level keys look weird and ugly. But then again, it's not a standard.

Also, we should probably have a country specific section subkey in the future, something like:

[...]
country-section:
  IT: ...
  NL:
  FR:

that would make it look better.

[bfabio]

@yaml-9000 deprecation
@yaml-9000 minor

[yaml-9000]

Thanks for your contribution 🙏

This is now marked as a deprecation-change proposal to the standard, this means that this change won't break any compatibility with the old versions of the Standard,
and it will be possibile to make the definitive change 6 months after the deprecation with a new major release.

The Chair will eventually pick up this proposal and start the voting procedure using @yaml-9000 vote-start

cc @publiccodeyml/chair @publiccodeyml/steering-committee

_{📄 Voting procedure | 📄 Working Group Charter | 🤖 bot commands}

[yaml-9000]

Thanks for your contribution 🙏

This is now marked as a minor-change proposal to the standard,
this means that old versions of publiccode.yml will still be valid with this change.

Example of minor changes are additions of new keys or making keys optional.

The Chair will eventually pick up this proposal and start the voting procedure using @yaml-9000 vote-start

cc @publiccodeyml/chair @publiccodeyml/steering-committee

_{📄 Voting procedure | 📄 Working Group Charter | 🤖 bot commands}