Re: [urn] << PLEASE IGNORE THE PREV. MAIL>> Expert review needed

[R Atarius <[e-mail]>]

Hi Lars
please see below
thanksRoozbeh

      From: "Svensson, Lars" <[e-mail]>
 To: R Atarius <[e-mail]> 
Cc: "[e-mail]" <[e-mail]>; "[e-mail]" <[e-mail]>; "[e-mail]" <[e-mail]>; "[e-mail]" <[e-mail]>; "Dale R. Worley ([e-mail])" <[e-mail]>
 Sent: Wednesday, April 11, 2018 5:28 AM
 Subject: RE: << PLEASE IGNORE THE PREV. MAIL>> [urn] Expert review needed
   
Hi Rozbeh,

Just a minor comment from me (but I'll read the complete draft when the new version is published):

On Friday, April 06, 2018 1:42 AM, R Atarius [mailto:[e-mail]] wrote:

[...]

> 4.2.3.  Check Digit
> 
>   This is a single hexadecimal digit (bits 1-4 of octet 8) and is used
>   as assurance of integrity in error-prone operations, e.g. when used
>   with certain types of readers during inventory management operations.
>   The check digit is not transmitted by the mobile equipment and are
>   not used in the MEID URN.
> 
> In section 4.2, for completeness, you give a lot of information that is
> not strictly required.  However you don't give the really non-trivial
> bit of information:  the formula for the check digit.  After reading
> this section, I was left curious what the check digit formula actually
> is!
> 
> [Roozbeh]: OK but can I leave it as it is?

I think that technically you could, but I also agree with Dale that it might be confusing to supply non-required information. Since the check digit is not used in the MEID URN, it might be better to omit this paragraph or to rephrase it as

"This is a single hexadecimal digit (bits 1-4 of octet 8). The check digit is not transmitted by the mobile equipment and is not used in the MEID URN."
[Roozbeh] I believe that's how I started but I received comments about its functionality and that's why I added that sentence. I am good either way. If that makes you, Dale and IETF community satisfied then I can remove that sentence. Please let me know.
**********************************************************************************************************************

Looking more closely at section 4.2, it feels a bit awkward that you first define the parts of the MEID format and then go on to put them together. You might want to consider rephrasing as follows:

4.2 MEID Format
The MEID format is 15 hexadecimal digits encoded in 8 octets as defined in [S.R0048-A]. The first eight hexadecimal digits constitute the manufacturer code, the next six hexadecimal digits the serial number within the manufacturer code. The last hexadecimal digit is a check digit. For more details on the hexadecimal encoding cf. 4.2.4.

4.2.4 Hexadecimal Encoding
The following figure ... [X.S0008-A].

[Roozbeh] I think that is what is called a "hanging section", since there should not be any text below 4.2 when there are 4.2.1, 4.2.2, etc. I can create a new subsection as "4.2.1 Overview"  with the text you proposed and shift other subsection with 0.0.1. Will that help?

Best,

Lars