On Sun, Mar 30, 2008 at 2:16 AM, Johannes Wagener <[EMAIL PROTECTED]> wrote: > Proposed XMPP Extension: IO DATA > > > Abstract: This specification defines an XMPP protocol extension for > handling the input to and output from a remote entity. >
Some remarks. You write "While SOAP over XMPP supports complex functionality it lacks an obvious mechanism for asynchronous usage (for example it has no default RESTful design: there is no sessionid like in Ad-Hoc Commands)." While it's true that in SOAP+XMPP specs there is no asynchronous message exchange pattern (and that was a mistake, though I think it's possible to add a new MEP), this is not related to REST. Neither the concept of session id is somewhat related to REST, at the contrary, REST explicitly forbids things like session ids. The basic principles of REST in fact are: - being able to address "resources" with URIs; since ad hoc commands end points nodes, whose URI may be xmpp:[EMAIL PROTECTED]/resource;node=nodename (if I remember well), they are RESTful in this aspect - be able to do actions (verbs like post/get/delete/put) on that resources; in this ad hoc commands are not RESTful, since they don't define a real action, they just provide a generic "execute" - stateless operations, and state or sessions are intentionally left out from REST, since they are too much application dependent; ad hoc commands have just a limited "session" concept, which is a sequence of operations forming a wizard with a start and an end. However applications may have different concepts of sessions, such as all operation between a login and logout, on a given resource or on a set of resources, or all operations in period of time; these are all concepts more complex than the model provided by ad hoc commands. For this reason I'd leave the responsibility of handling a session to the application, which should find a way for passing state information among requests as cookies or other mechanisms in HTTP. bye -- Fabio Forno, Ph.D. Bluendo srl http://www.bluendo.com jabber id: [EMAIL PROTECTED]
