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InstrumentSequenceControl references a PhysicalInstrument just as InstrumentControl in DDI 2+ references a Question. Arguably neither are really ControlConstructs. Instead they are used within a ControlConstruct to reference what is being controlled. InstrumentSequenceControl references a PhysicalInstrument and assists in protocol representation. In protocol representation instruments may be executed conditionally. More generally, InstrumentSequenceControl facilitates the representation of an instrument order within a StudyUnit.


StudyControl references a Study. StudyControl enables the representation of a research protocol at the Study level. [If the only purpose of the object is to carry a Study, it should be seriously considered for melting with another object. Modeling rules state that any object needs to have a reality of its own. Carrying another object is not a reality. If I misunderstood, please clarify the description instead]


A SKOS concept scheme can be viewed as an aggregation of one or more SKOS concepts.


Provides an extensible framework for specific computation or transformation objects.


The class skos:Concept is the class of SKOS concepts.
A SKOS concept can be viewed as an idea or notion; a unit of thought. However, what constitutes a unit of thought is subjective, and this definition is meant to be suggestive, rather than restrictive.
The notion of a SKOS concept is useful when describing the conceptual or intellectual structure of a knowledge organization system, and when referring to specific ideas or meanings established within a Knowledge Organization System.


SplitJoin consists of process steps that are executed concurrently (execution with barrier synchronization). That is, SplitJoin completes when all of its components processes have completed.


The components of a Split consists of a number of process steps to be executed concurrently with partial synchronization. Split completes as soon as all of its component process steps have been scheduled for execution.


Generic container for an output instance of a Process Step.


Generic container for an parameter used to identify specific information moving into and out of WorkflowStep.


A Classification Item represents a Category at a certain Level within a Statistical Classification.


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