riso.belief_nets.BeliefNetwork combine
{
    riso.belief_nets.Variable or-gate
    {
        type discrete { "all OK" "at least one failure" }
        parents {
            phoenix.ef.boun.edu.tr/monitor1.status
            heaventemple.mit.edu/monitor2.status
            www.cdsoft.de/monitor3.status
            }
        distribution riso.distributions.OrGate { }
    }
}