issue 6432 - yet another proposal

(resending since I think the first one was rejected due to the attachment)

I was re-reading Bob's comments [1] and I think I might have been reading 
too much into the existing wording as well.  Even if people use MC the 
messages are still sent asynchronously and unsolicited (whatever those 
terms may mean).  MC doesn't change that - it just changes how the 
connection is established.  With that in mind, I don't think we need to 
really modify the definition of Push mode (other than to make it clear 
that the sink is identified by an EPR).  However, I think it would be wise 
to rethink the name of "Push" mode.  Assuming for the moment that we do 
keep the Mode attribute, "Push" mode is really misnamed since its not 
really about Push vs Pull, its really just about using an EPR to identify 
the Sink - what people choose to put in that EPR is up to them.  With that 
in mind I've attached another proposal that does two things:
1 - renames "Push Mode" to "EPR Mode" - which more accurately reflects 
what we're doing from a SOAP perspective
2 - adds the minor hint of using MC for non-addressable endpoints from the 
previous proposal - which is what this issue is really about

I think this keeps the wording that Wu was looking for, but aligns 
WS-Eventing with how all other WS-* specs use EPRs.  And is 100% backwards 
compatible - no coding changes are needed for existing implementations. We 
can then, separately, discuss whether or not we want to explicitly support 
the notion of non-EPR-based delivery modes in Dave's issue [2].  Not to 
mix topics but I will point out that in Wu's issue 6425 [3] we agreed to 
mandate that the Event Source be identified by an EPR.

Proposal:  http://www.soaphub.org/public/files/w3c/wseventing-6432-v1.html

[1] 
http://lists.w3.org/Archives/Public/public-ws-resource-access/2009Mar/0122.html
[2] http://www.w3.org/Bugs/Public/show_bug.cgi?id=6692
[3] http://www.w3.org/Bugs/Public/show_bug.cgi?id=6425

thanks
-Doug
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