As you have seen I have responded to various mails and I believe I understand 
what people want. 

Some of you obviously have plans to write extensions (in other organizations 
outside the IETF, and as vendor-specific extensions).  That's fine. 

You want something really lightweight (in terms of process) that does not 
require you to come to the IETF to write an RFC and get the entire working 
group excited about your hobby project. Clearly, this makes sense to me. 

So, the policy for adding new extensions has to be either 'Specification 
Required' or 'Expert Review' with the difference being about the information 
that goes into the registry. For the cases I have seen on the list it will not 
make a huge difference. It may make a difference for an organization where 
their final specifications are not publically available. Yes, these 
organizations still exist today....

Then, there is the question about how the identifier that gets registered 
should look like. You seem to like the idea of concept of a structured 
identifier (since otherwise you wouldn't be using it in various working group 
drafts already, including the example in draft-ietf-oauth-urn-sub-ns itself!) 
but you don't like to call it hierarchy because you fear that you will not be 
allowed to do whatever you want. An unjustified concern.

In that sense version -03 of the draft (see 
http://tools.ietf.org/id/draft-ietf-oauth-urn-sub-ns-03.txt) pretty much does 
already everything you want already do. As a policy it says "Expert Review" and 
it has the structure in the ID that you guys are using in your current drafts!

There are two options to go forward. 

The first one is to roll-back to version -03. 

Another option is to take version -04 and add text that explains the <id> a bit 
further by saying that it may contain a structure and other documents 
populating the registry will define the detailed structure of the <id> part. 

In http://datatracker.ietf.org/doc/draft-ietf-oauth-assertions/ we would then 
add a section to the IANA consideration section saying that any new extensions 
for client assertions needs to be registered under 
urn:ietf:params:oauth:client-assertion-type:

The same for urn:ietf:params:oauth:grant-type: in some other document and so 
on. 

Ciao
Hannes

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