Atomic fl ow port [SysML] : An object fl ow port that is not typed by an object fl ow specifi cation,
but which is a system component or a data type.
Attribute [UML] : An attribute defi nes a structural property of a class. This description consists of
visibility, name, type, and a multiplicity.
Glossary
286 Glossary
B
Behavior diagram [UML] : A diagram used in SysML and UML to describe dynamic aspects.
Block [SysML] : A modular unit that describes the structure of a system or element.
Block defi nition diagram [SysML] : A diagram that shows the defi nition of blocks and their
relationships (e.g., a composition).
Boundary system [SYSMOD] : A special external system that provides an interface to another
external system.
C
Call event [UML] : Event.
CallBehaviorAction [UML] : An elementary action that invokes a behavior element, such as an
activity, directly.
CallOperationAction [UML] : An elementary action that invokes an operation.
Change event [UML] : Event.
Choice pseudo state [UML] : The decision is a pseudo state which, when reached, evaluates
conditions to select the next transition.
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