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Subject: Re: [xdi] How to send XDI message to server?

Sounds good to me...

On Tue, 22 May 2012, Joseph Boyle wrote:

PDEC is starting to use a new groups/lists provider we now have up at http://lists.pde.cc/lists/
The new personal-clouds list is on it and I think Kaliya wants to transfer PDEC's Google Groups lists to it.
I could easily create an xdi-dev list there.

On May 22, 2012, at 1:56 PM, Markus Sabadello wrote:

Thanks Joseph for re-sending..

For an XDI Developer list, I think Google Groups would be easiest.

Yes we have talked about an HTTP REST binding in the past..

The semantics of GET and $get, as well as those of DELETE and $del seem to be the same, but mapping $add and $mod to POST and PUT is difficult. We can of course do whatever we want, but REST purists won't like it.

I don't think any HTTP query parameters should be used.


On Tue, May 22, 2012 at 10:39 PM, Joseph Boyle <planetwork@josephboyle.net> wrote:
Markus, this is Yuriy and Drummond's replies - forwarding to your gmail since it sounds like your xdi.org mail lost them.

On May 13, 2012, at 9:32 PM, Drummond Reed wrote:


Thanks for sending this. I really wish you could join the TC directly so you could be part of these discussions - we have talked quite a bit about a pure REST binding for XDI, and I think there is agreement on your mapping of the verbs.

I think we're going to reinstate either the XDI Google Group or start a new XDI.org mailing list on XDI so we can have discussions with XDI developers who are not on the TC.

Mike, Markus: it makes sense to me that XDI.org should host the XDI Developer mailing list. If we are going to redo the website, what are our options for a new mailing list? Or should we restart the Google Group?


On Sat, May 12, 2012 at 3:35 AM, Yuriy Zabrovarnyy <yzabrovarniy@gmail.com> wrote:
It's very good idea to standardize REST for XDI Messaging. A few points from my side:


Please consider following example from http://wiki.oasis-open.org/xdi/XdiMessagePatterns


Approach with inlined $get operation can NOT be used because here are 2 $get operations.
E.g. GET /=markus+email HTTP 1.1

As solution parameters can be used to pass $get operation nodes.

2. It's important to specify exact names of parameter as it's made for OAuth and OpenID standards. Except operations message request also contains link contract address, graph id, sender and authentication information (e.g. token).

3. XDI operations as HTTP methods
According to wiki (http://en.wikipedia.org/wiki/Representational_state_transfer) these binding between HTTP methods and XDI operations looks logical to me.
GET    - retrieve - $get
PUT    - replace  - $mod
POST   - create   - $add
DELETE - delete   - $del

To summarize it makes sense to provide sample how exactly XDI Message Request from oasis wiki can be made via REST web service with exact parameters.

(I can't send email to oasis mail list, therefore mail is sent only to people who is in my contact list.)

Yuriy Z

On Sat, May 12, 2012 at 12:18 AM, Joseph Boyle <planetwork@josephboyle.net> wrote:
Yes XDI2's looks like a canonical REST interface. I like it.

Sent from my iPhone

On May 11, 2012, at 1:28 PM, Markus Sabadello <markus.sabadello@xdi.org> wrote:

Oops sorry I made one mistake..

* HTTP GET is treated like an XDI $get operation on an XDI address passed in the URL, e.g.

GET /=markus+email HTTP 1.1
becomes something like

On Fri, May 11, 2012 at 10:26 PM, Markus Sabadello <markus.sabadello@xdi.org> wrote:
Hi all,

During today's XDI TC call I mentioned XDI Messaging.

The one concrete issue I'd like to figure out is how exactly a message is sent from an XDI client to an XDI server.

As far as I know, current implementations work like this:


* A message is passed as a "message" parameter, either via HTTP GET or POST

* No asynchronous XDI messaging supported

XDI2 / Project Danube:

* A message can be sent via HTTP POST (as the full HTTP body, not encoded as a parameter)

* HTTP GET is treated like an XDI $get operation on an XDI address passed in the URL, e.g.

GET /=markus+email HTTP 1.1
becomes something like

* HTTP DELETE is treated like XDI $del

* HTTP PUT is treated like XDI $add

* An Accept: header can be sent to indicate the desired response format, e.g. JSON, or list of XDI statements

* No asynchronous XDI messaging supported

I have heard several people say that XDI needs an interface that is RESTful on the HTTP level.

Please discuss on this thread, then we can create an page on the TC wiki.
BTW there are lots of pages on the TC wiki that need updating.


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