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Document: draft-ietf-core-dev-urn-08
Reviewer: Christer Holmberg
Review Date: 2020-11-22
IETF LC End Date: 2020-12-02
IESG Telechat date: Not scheduled for a telechat

Summary:

The document is well written, and easy to read, and I don't have any technical issues. 

However, I do have some questions (one that I consider major, the rest minor/editorial) which I think needs clarifications:

Major issues:

Q1_MA:

Section 6.1. says:

"The URNs generated according to the rules defined in this document
result in long-term stable unique identifiers for the devices."

- What are those rules? 

In Section 3.3 I do see the following statement:

"The DEV URN type SHOULD only be used for persistent identifiers, such
as hardware-based identifiers or cryptographic identifiers based on
keys intended for long-term usage."

Is that what you refer to as rules? Or, have I missed something?

Also, to me the statement seems like an important applicability statement for DEV URNs. If so, should there be a separate Applicability (or similar) section earlier in the document, which points it out?


Minor issues:

Q2_MI:

Section 3.1. says:

"The DEV URNs identify devices with device-specific identifiers such as network card hardware addresses."

- Can there be multiple DEV URNs associated with a single device?


Q3_MI:

Section 3.1. says:

"DEV URN is global in scope."

- What does that actually mean? 


Nits/editorial comments:

Q4_ED:

In the Introduction, SenML and RD are given as examples where the URN may be useful. It would be nice to exactly see some usage examples of the URN. Section 5 only contains examples of the URN itself.