App to App SAML

Let's say I have App1 and App2.

1. App1 submits a SAML assertion (on behalf of a user) to App2

2. App2 to verifies the assertion and allows "app1" access to specific user data

3. App1 makes a request for "foo"

4.  <-- response sent

5. App1 makes a request for "bar"

6. <-- response sent

Is this scenario discussed in any SAML 2.0 specifications?

There are ways to solve this but I am looking for any SAML 2.0 defined model/approach

(or anyone experience with this kind of model).

Thanks,

/Prasanta