[Quantlib-users] What does x0 represent in a Process for ShortRateDynamics?

[newbie73 <lui...@av...>]

I've been trying to understand more about the mechanics of the Short Rate
Models.  Can someone give a high level explanation of the Process class and
how the ShortRateDynamics class uses it to determine the theoretical value
of the short rate?

I am assuming that x0 refers to the maturity in years of the short rate,
correct?  So the call:
    r0 = dynamics()->process().shortRate(0.0, x0)
is requesting the theoretical short rate from time = [0.0, x0] ?

discount(Time t)
{
    x0 = dynamics()->process().x0
    r0 = dynamics()->process().shortRate(0.0, x0)
    return discountBond(0.0, t, r0) 
}
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