Logout from a single SP.

["Giuseppe Sarno" <gsarno@nortel.com>]

Title: Logout from a single SP.

Hi,

I'm trying to understand whether SAML2.0 can support the following case:

userA logged on SPA,SPB,SPC and authenticated by IDP.
Assumption:  IDP will have to track the userA session to implement the single logout.

Now userA wants to logout from SPB and only from SPB.
How can now tell the IDP that this session is gone (and only this one) so that it can update the session records?

Is this case supported by the standard SAML ?

Regards.
Giuseppe.