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Various other model elements may be necessary to help develop a derived requirement, and these model element may be related by a «refinedBy» relationship.

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Figure D.12 - Establishing Derived Requirements and Rationale from Lowest Tier of Requirements Hierarchy
Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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EXAMPLE
INFO
UML keywords
Refine
SysML keywords
HSUV sample problem
Requirement
DeriveReqt
Refine
Keywords
Derived requirements, for the purpose of this example, express the concepts of requirements in the HSUVSpecification in a manner that specifically relates them to the HSUV system.
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Various other model elements may be necessary to help develop a derived requirement, and these model element may be related by a «refinedBy» relationship.
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Note how PowerSourceManagement is “RefinedBy” the HSUVOperationalStates model (Figure D.8).
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Figure D.12 shows a set of requirements derived from the lowest tier requirements in the HSUV specification.
The Refine stereotype specializes UML4SysML Refine and DirectedRelationshipPropertyPath to enable refinements to identify their sources and targets by a multi-level path of accessible properties from context blocks for the sources and targets.
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