Add two additional thoughts,
(1) I hope NMDA datastore can be used to compare one datastore at two different 
timepoints, so I am not sure source and target defined in the model are enough 
to support this case.
(2) NMDA Base events defined in 
(https://tools.ietf.org/html/draft-wu-netconf-base-notification-nmda-01 can 
leverage NMDA diff to perform NMDA data validation, right now it is up to the 
server to detect validation event, but now we might rely on NMDA diff to decide 
which object is missing, what failed objects are. NMDA diff becomes a good tool.
On the other hand, user might want to know when applied configuration start, 
when applied configuration complete, based on this to see when to perform NMDA 
diff. To address this, we might consider two or three new notifications
In the draft-wu-netconf-base-notification-nmda-01 to help to decide when to use 
NDMA diff

-Qin
-----邮件原件-----)
发件人: netmod [mailto:[email protected]] 代表 Joe Clarke
发送时间: 2018年7月20日 21:52
收件人: [email protected]
主题: [netmod] Thoughts on draft-clemm-netmod-nmda-diff

I just had a chance to finish reading this.  The in-person meeting group seems 
to strongly support this work, and I agree.

Coming from a serviceability standpoint, I find this might serve as a precursor 
to a VCS-like "blame log".  Would it be reasonable to include identifiers as to 
who (or what) made the change and when?  Sorry if this was raised at the mic 
today.  I came to the room a bit late.

Joe

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