standardizing webmention

there has been some talk about standardizing webmention as part of the work
of this WG

a few comments

1. I think webmention would really benefit from having a normative stable
document -- when doing a search on the web there are many places you can be
lead to, and it's really hard for a developer to know they are in the right
place (eg webmention.org, webmention.net, indieweb wiki)

2. writing up webmention as a w3c note should not be a hard job ... it's a
pattern that was being used 10 - 20 years ago ... for those not familiar,
my understanding is it's a simple 2 parameter query string (ie source and
target)

3. I am very impressed with what has been done with such a simple tech but
I dont think it scales for a number of reasons which I'll point out:

4. webmention is a call by reference type function, whereas most functions
allow both call by reference and call by value.  So when say activity pump
sends a serialized activity stream, webmention would fail.

5. webmention objects dont return URIs, this violates web axioms, where
everything of note should have a URI

6. webmention is not extensible over and beyond the source and target
parameters, which is problematic for any extra kind of data

7. webmention is not namespaces, preventing both open ended scalability,
but also it's hard to translate source and target into URIs ... would
should they be?  urn:source and urn:target ... any suggestion here is
problematic.

8 webmention does not accept the mime types being standardized in this
group for a JSON based serialization

Other than that I think it's an incredibly useful technology.  That can
solve some but not all of the user stories and patterns this group is
working on.  I dont think it can be a basis for a REC track social web API
(I could be wrong there!) but im very excited about what is being done with
it, at least as proof of concept, and would love to see something more
official from the group on it, if that is considered appropriate -- mainly
I think there would be a easily findable stable reference to the spec.