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. 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).
There are several types of Dependencies:
•Dependency
•Usage
•Abstraction
To create a Dependency, you can:
•Draw a Dependency line from the Client to the Supplier.
The Dependency option supports drawing of a single line to represent the relationship.
Where a Dependency Node symbol exists on a diagram, the refresh for representational consistency action will hide any new Dependency line that represents the same relationship.