I am going to be making a presentation on Oasis SAML and XACML at the ExpeditionWorkshop (Exploring Identity Management Landscape) at NIST.
The workshop page is located here.
If you would like to take a peek at my presentation, then click here.
Oasis SAML v2 is a specification that deals with Federated Identity and Oasis XACML v2 is a specification that deals with access control.
If you need to take a peek at SAML2 payload carrying XACML2 request/response, then please take a look at my other post.