Barry:
>> 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.
Indeed, I forgot about RFC 7405. Much better solution.
Russ
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