The number of seconds between two action invocations of a periodic scheduler. Implementations must guarantee that action invocations will not occur before at least schedInterval seconds have passed. The scheduler must ignore all periodic schedules that have a schedInterval value of 0. A periodic schedule with a scheduling interval of 0 seconds will therefore never invoke an action. Implementations may be forced to delay invocations in the face of local constraints. A scheduled management function should therefore not rely on the accuracy provided by the scheduler implementation. Note that implementations which maintain a list of pending activations must re-calculate them when this object is changed.