FACTOID # 69: Almost the entire Cook Islands are covered by forest.
 
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Encyclopedia > Actor (UML)

In the Unified Modeling Language (UML), an actor is something or someone who supplies a stimulus to the system. It can also be thought of as something the system requires in order to function. Without a customer (an actor) in a restaurant, the process of ordering food cannot begin. In addition to actors there also exists primary actors.




  Results from FactBites:
 
Introduction to UML 2 Sequence Diagrams (3167 words)
UML sequence diagrams model the flow of logic within your system in a visual manner, enabling you both to document and validate your logic, and are commonly used for both analysis and design purposes.
Messages are indicated on UML sequence diagrams as labeled arrows, when the source and target of a message is an object or class the label is the signature of the method invoked in response to the message.
I used a UML note in Figure 4; notes are basically free-form text that can be placed on any UML diagram, to provide a header for the diagram,indicating its title and identifier (as you may have noticed, I give unique identifiers to all artifacts that I intend to keep).
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