how different is OpenID from SXIP?

[Grant Monroe]

On 3/17/06, Dick Hardt <dick at sxip.com> wrote:
> SXIP also allows you to store all your data on your own computer. Since the
> data is pushed, the repository does not need to be locatable by the RP. In
> OpenID, the IDP needs to be callable by the RP.
Does SXIP require the URL identifier to be publicly accessible? In
other words, is it necessary for a user's persona URL to be reachable
by a relying party?