Architecting and designing > SysML > Model Elements > Block > OpaqueBehavior
  
OpaqueBehavior
SysML specifies several types of behaviors:
Activity
State Machine
Interaction
Opaque Behavior, which has subtype FunctionBehavior
OpaqueBehavior is behavior with implementation-specific semantics, modeled as a place-holder before another behavior is chosen.
See also
Class
Activity
AssociationClass
FunctionBehavior
Interaction
State Machine
Stereotype
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Block