Web Viewer can indirectly support Security Assertion Markup Language (SAML) if you code a security exit to handle it. Using the exits to do this is described in the Web Viewer Programmers Guide.
There is no direct support for SAML in the current 12.1 (or 12.0) Web Viewer, but direct support has been requested (as an "idea") by a number of other customers. Go the Web Viewer/Output Management User Community and vote up that idea.
Release: OUTWBV01300-12.1-Output Management-Web Viewer for AIX