> 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
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