Re: [core] [Last-Call] Iotdir telechat review of draft-ietf-core-dev-urn-09

[Barry Leiba <[e-mail]>]

> You are, of course, correct.  RFC 5234 says:
>
>       ABNF strings are case insensitive and the character set for these
>       strings is US-ASCII.
>
> However, that raises a different issue:
>
>    The DEV URN syntax allows both upper and lower case characters.  The
>    URN-equivalence of the DEV URNs is defined per [RFC8141] Section 3.1,
>    i.e,. two URNs are URN-equivalent if their assigned-name portions are
>    octet-by-octet equal after applying case normalization to the URI
>    scheme ("urn") and namespace identifier ("dev").
>
> So, the ABNF should be changed so that the "mac:", "ow:", "org:", "os:", and "ops:" are required to
> be lowercase.  I guess that means replacing each letter with the appropriate value in the %x61-7A
> range.  That will not be as easy to read...

Not if it's done that way, indeed.  But RFC 7405 helps us here.

Barry