Addison Phillips wrote:
>
> Hi,
>
> In message 1720 I asked/complained about the handling of language tags
> in RSS 2.0 best practices and specification. The links provided (to
> W3C, Netscape, Library of Congress) are outdated and no mention is
> made of the actual standard used to define these language values (IETF
> BCP 47, RFC 4646).

The feed validator uses the following:

http://feedvalidator.org/docs/error/InvalidLanguage.html

> In addition, on the URI list (uri@... <mailto:uri%40w3.org>), there
> is some question
> about whether URLs in RSS correspond to the definition in XML (that
> is, something called a "legacy encoded IRI") or to "pure" URIs. This
> is important as it relates to how non-ASCII domain names and path
> values are handled.

Link to the discussion:

http://lists.w3.org/Archives/Public/uri/2008Jun/0117.html

> Best Regards,
>
> Addison Phillips
> Globalization Architect, Lab126
> Chair, W3C Internationalization Core WG

- Sam Ruby