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A Dependency is a Relationship that signifies that a single model Element or a set of model Elements requires other model Elements for their specification or implementation.

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Examples of Dependency and Usage
Dependency vs Usage vs Association vs Connector
Association vs Connector - detailed
Webel: A plain Dependency that is not stereotyped is always strictly timed-ordered; the supplier (target) must exist before the client (source).
Webel: SysML: TIP: CONVENTION (default policy suggestion): Use reverse time ordering for Dependency, reserve Usage, PackageImport, ElementImport for software dependencies
Source
Unified Modeling Language 2.5.1
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
DirectedRelationship
NamedElement
Full quote
A Dependency is a Relationship that signifies that a single model Element or a set of model Elements requires other model Elements for their specification or implementation.
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This means that the complete semantics of the client Element(s) are either semantically or structurally dependent on the definition of the supplier Element(s).
A Usage is a Dependency in which the client Element requires the supplier Element (or set of Elements) for its full implementation or operation.
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This means that the complete semantics of the client Element(s) are either semantically or structurally dependent on the definition of the supplier Element(s).
A Usage is a Dependency in which the client Element requires the supplier Element (or set of Elements) for its full implementation or operation.
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