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A Copy relationship is a dependency between a supplier requirement and a client requirement that specifies that the text of the client requirement is a read-only copy of the text of the supplier requirement.

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Figure 16-5: Use of the copy dependency to facilitate reuse
The SysML Copy relationship can be used to "import" Requirements from an existing read-only library into a new project context.
A basic Requirement is an AbstractRequirement
The Copy relationship
SysMLv1: Only the 'text' of the client Requirement of a Copy relationship need be the same as the 'text' of the supplier Requirement. The 'id' of the client Requirement SHOULD be different (unique).
Source
OMG Systems Modeling Language (SysML) 1.6
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
Dependency
Dependency::client
Dependency::supplier
SysML keywords
Requirement
Copy
AbstractRequirement::text
AbstractRequirement::id
Full quote
A Copy relationship is a dependency between a supplier requirement and a client requirement that specifies that the text of the client requirement is a read-only copy of the text of the supplier requirement.
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A Copy dependency created between two requirements maintains a master/slave relationship between the two elements for the purpose of requirements re-use in different contexts
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A Copy dependency created between two requirements maintains a master/slave relationship between the two elements for the purpose of requirements re-use in different contexts
When a Copy dependency exists between two requirements, the requirement text of the client requirement is a read-only copy of the requirement text of the requirement at the supplier end of the dependency.
Copy::1_source_and_taget_are_requirements A Copy dependency may only be created between two NamedElements that have a subtype of the abstractRequirement stereotype applied
Copy::2_same_text The text property of the client requirement is constrained to be a read-only copy of the text property of the supplier requirement and this applies recursively to all subrequirements
Figure 16-5 illustrates the use of the Copy dependency to allow a single requirement to be reused in several requirements hierarchies. The master tag provides a textual reference to the reused requirement.
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 ...
16.3.2.1 AbstractRequirement: id : String [1] The unique id of the requirement.
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