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There are a class of use-cases in which we want to construct or create new DSOs (DSpaceObject) given an identifier in a task. In these cases, there may be no live DSO to pass to the task.
You actually can get curation system to call performId() if you queue a task then process the queue - when reading the queue all CLI has is the handle to pass to the task. 

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Bundled Tasks

DSpace 1.7 bundles a few tasks and activates two (2) by default small number of tasks of general applicability. Those that do not require configuration (or have usable default values) are activated to demonstrate the use of the curation system. These They may be removed (deactivated by means of configuration) if desired without affecting system integrity. Those that require configuration may be enabled (activated) by means editing DSpace configuration files. Each task - current as of DSpace 4.0 - is briefly described herebelow.

NoOp Curation Task

This task does absolutely nothing. It is intended as a starting point for developers and administrators wishing to learn more about the curation system.

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