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The use of namespace containment to specify requirements hierarchies precludes reusing requirements in different contexts since a given model element can only exist in one namespace.

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The Copy relationship
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
AbstractRequirement
Requirement
composite (compound) requirement
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The use of namespace containment to specify requirements hierarchies precludes reusing requirements in different contexts since a given model element can only exist in one namespace.
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Since the concept of requirements reuse is very important in many applications, SysML introduces the concept of a slave requirement.
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Compound requirements can be created by using the nesting capability of the class definition mechanism.
A composite requirement can contain subrequirements in terms of a requirements hierarchy, specified using the UML namespace containment mechanism. This relationship enables a complex requirement to be decomposed into its containing child requirements.
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Since the concept of requirements reuse is very important in many applications, SysML introduces the concept of a slave requirement.
A slave requirement is a requirement whose text property is a read-only copy of the text property of a master requirement. The text property of the slave requirement is constrained to be the same as the text property of the related master requirement.
The master/slave relationship is indicated by the use of the copy relationship.
AbstractRequirement::/master : AbstractRequirement [0..*] This is a derived property that lists the master requirement for this slave requirement. The master attribute is derived from the supplier of the Copy dependency ...
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