# File lib/omniauth/strategies/saml/auth_response.rb, line 62
        def session_expires_at
          @expires_at ||= begin
            node = REXML::XPath.first(document, "/p:Response/a:Assertion/a:AuthnStatement", { "p" => PROTOCOL, "a" => ASSERTION })
            parse_time(node, "SessionNotOnOrAfter")
          end
        end