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Note how PowerSourceManagement is “RefinedBy” the HSUVOperationalStates model (Figure D.8).

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Figure D.12 - Establishing Derived Requirements and Rationale from Lowest Tier of Requirements Hierarchy
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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
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UML keywords
Refine
SysML keywords
HSUV sample problem
Requirement
Refine
Keywords
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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Note also that rationale can be attached to the «deriveReqt» relationship. In this case, rationale is provided by a referenced document “Hybrid Design Guidance.”
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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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