Re: Deprecated language tags and document conformance

Ian Hickson wrote:
> On Thu, 18 Oct 2007, Henri Sivonen wrote:
>> I'd expect deprecated RFC 4646 language tags or subtags to render a 
>> document non-conforming for the purpose of overall HTML5 document 
>> conformance. Is my expectation correct?
>>
>> On a related note, the grandfathered language tag i-default seems 
>> inappropriate for HTML5 lang or XHTML5 xml:lang, since these attributes 
>> can take the non-RFC4646 value "" to indicate that the natural language 
>> is unknown. Should lang='i-default' (or xml:lang='i-default') be taken 
>> to render the document non-conforming?
> 
> My intent is to defer to the relevant standards and let them decide what's 
> valid or not. I don't think we should micromanage this, since it changes 
> so much. (Right now HTML5 refers to RFC3066, but I'll update the reference 
> appropriately to the moving-target reference rather than a specific RFC 
> before we're done.)

If you want to refer to a specific version, refer to what's current now. 
If you want to refer to "the latest and greatest", refer to BCP 47.

BR, Julian