Push vs Pull

[Dick Hardt]

On 3-Mar-06, at 10:56 AM, Martin Atkins wrote:
> YADIS is likewise a Pull protocol, since the consumer (relying party)
> actively asks "What services does this URL support?" (or some question
> of that nature)
>
> I'm having trouble thinking of use cases for "push" where Yadis is
> concerned. Yadis could be used for capability discovery of a Push
> endpoint, but that doesn't change Yadis at all; the capability  
> discovery
> step is still a Pull, even if what follows is a push.

My understanding of Yadis was that is was a discovery protocol, which  
typically is a Pull mechanism, and is needed to support even Push  
architectures. (DNS is Pull)

-- Dick