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When a requirement has nested requirements, all the nested requirements apply as part of the container requirement. Deleting the container requirement deleted [deletes] the nested requirements, a functionality inherited from UML.

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Figure D.11 - Establishing HSUV Requirements Hierarchy (containment)
SysML: Webel recommends use of an additional custom «requirementGroup» stereotype for compound Requirements that serve as owning Namespaces and are subject to the satisfaction policy that all child requirements must be satisfied.
Composite (a.k.a. "compound") Requirements
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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INFO
SysML keywords
Requirement
composite (compound) requirement
subrequirement
Keywords
Subrequirements shall be accessed through the "nestedClassifier" property of a class.
Full quote
When a requirement has nested requirements, all the nested requirements apply as part of the container requirement. Deleting the container requirement deleted the nested requirements, a functionality inherited from UML.
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A requirement specifies a capability or condition that must (or should) be satisfied.
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