Prototypical use case attempt: Registration

[Fen Labalme <fen@idcommons.org>]

At the TC f2f in New Orleans, we defined a set of Prototypical Use 
Cases, see: http://xrixdi.idcommons.net/moin.cgi/UseCaseMatrix

As Victor and I are implementing a simple SSO system with Profile 
Sharing (in the next few weeks!) these Use Cases are of great interest 
to us, to say the least.  Tonight we created a first cut at a mechanism 
for e-name registration, from the standpoint of what we are building, 
e.g, a platform for members of communities to obtain e-names and then 
use them across other (Identity Commons) communities.  See: 
http://xrixdi.idcommons.net/moin.cgi/XdiUseCases/EnameRegistration

Note that I've also added a variation in which greater anonymity is 
provided by requiring only one trust point, the Data Broker.

We are aware that XACML, SAML 2.0 and possibly other standards might 
provide useful tools, but the truth is we don't have the time nor 
resources (yet) to take full advantage of such work.  So as we cut 
corners (speed and cost versus quality), we hope to benefit from this 
body's greater knowledge of these standards and other best practices to 
help keep us from falling off some obvious cliff.  (Not to mention the 
most important standard of all in this work: XRI.)  Our goal is to 
create initial implementations which will provide insights useful for 
our ensuing reference implementations that will be fully standards 
compliant.  We are soliciting your comments, criticisms and suggestions.

Next question: is anyone working on #2, Generic Data Sharing, 
particularly WRT Create and Query, as that is our next hurdle.

TIA,
Fen and Victor (gonzo trailblazers)

PS: Our code is GPL licensed, and I expect it to be BSD licensed, too 
(paving the way for commercial use) though this has not yet been finalized.