Similarly, for trigger-resource-control: the client might send a base PDU with several PDUs nested, and later send a trigger-resource-control request. From a modelling perspective it applies to the base PDU. But the request could actually be asking (based on the report-id requested) "how far into the sequence are you?" and subsequently the client might issue a second trigger request specific to the embedded request, which (again, from an operation model perspective) would still apply to the base PDU.
There are distinct optimization objectives of encapsulation. Three examples are:
Examples: