[urn] Re: Registration for `c2pa` URN

Thanks.  Updated ABNF. (we had too many `:`s coming up in conjunction with the optional values.


c2pa_urn = c2pa-namespace UUID [claim-generator [version-reason]]

c2pa-namespace = "urn:c2pa:"

; this definition is taken from RFC 9562
UUID     =  4hexOctet "-"
                                                2hexOctet "-"
                                                2hexOctet "-"
                                                2hexOctet "-"
                                                6hexOctet
hexOctet = HEXDIG HEXDIG
DIGIT    = %x30-39
HEXDIG   = DIGIT / "A" / "B" / "C" / "D" / "E" / "F"

; ASCII, but not Control Characters or Graphic Characters
visible-char-except-space = %x21-7E / %x80-FF

; claim-generator-identifier is a string of 0 to 32 visible-char-except-space characters
; this means that an empty string is valid
claim-generator = ":" claim-generator-identifier
claim-generator-identifier = 0*32visible-char-except-space

; version-reason is a string consisting of a positive integer
; followed by an underscore and a positive integer
version-reason = ":" version "_" reason
version = 1*DIGIT
reason = 1*DIGIT



From: Peter Saint-Andre <[email protected]>
Date: Friday, August 16, 2024 at 10:03 AM
To: Leonard Rosenthol <[email protected]>, Dale R. Worley <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: [urn] Re: Registration for `c2pa` URN
EXTERNAL: Use caution when clicking on links or opening attachments.


Feel free to send only the ABNF.

On 8/16/24 6:41 AM, Leonard Rosenthol wrote:
> We did find a few issues with the ABNF, so I have an update to that.
>
> Should I send a full update or just the changes?
>
> Thanks,
>
> Leonard
>
> *From: *Dale R. Worley <[email protected]>
> *Date: *Tuesday, August 13, 2024 at 3:25 PM
> *To: *Leonard Rosenthol <[email protected]>
> *Cc: *[email protected] <[email protected]>
> *Subject: *Re: [urn] Registration for `c2pa` URN
>
> EXTERNAL: Use caution when clicking on links or opening attachments.
>
>
> Leonard Rosenthol <[email protected]> writes:
>> Here is the revised registration proposal.   The links to 2.1 will be
>> live tomorrow (2-Aug-2024).
>>
>> Leonard
>> Namespace Identifier:  c2pa
>>
>> Version:  1
>>
>> Date:  2024-07-30
>
> It all looks good to me.  The only comment I have is that the ABNF
> allows the version to have leading 0's, though the text makes clear that
> the *value* 0 is not permitted.  But as long as C2PA is OK with that,
> that's fine.
>
> Dale
>
>
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