Validate IRIs and language tags

[lanthaler]

I think we should discuss whether JSON-LD processors should validate IRIs and language tags or just assume they are valid.

[niklasl]

Yes. Many systems are lax about that. They should/must warn about the malformed value, but probably not drop it.

[tidoust]

Unless it's really needed for other parts of the algorithms, I would not make IRI validation a MUST. A JSON-LD Implementation/Processor is not a JSON-LD validator and will not include validation code if that can be avoided, e.g. to keep the amount of code needed to a bare minimum for execution in constrained environments.

It may also be tough to include such validation code in an implementation. For instance, it may be hard to validate an IRI properly in a JavaScript implementation running client-side.

[lanthaler]

RESOLVED: JSON-LD Processors MAY issue validation warnings for malformed IRIs and BCP47 language strings, but they MUST NOT attempt to correct validation errors.

[lanthaler]

I've updated the spec according the resolution. I will therefore close this issue in 24 hours unless I hear objections.