Specifies the participants in this Interaction. This may for example be noise or other activity that we do not want to describe in detail.Ī frame represents an interaction, which is a unit of behavior that focuses on the observable exchange of information between ConnectableElements. We interpret this to be because the origin of the message is outside the scope of the description. The set of lifelines contained by the continuation.Ĭreate message is a kind of message that represents the instantiation of (target) lifeline.ĭestroy message is a kind of message that represents the request of destroying the lifecycle of target lifeline.Ī DurationConstraint defines a Constraint that refers to a DurationInterval.Ī duration used to determine whether the constraint is satisfied.ĭuration message shows the distance between two time instants for a message invocation.Ī found message is a message where the receiving event occurrence is known, but there is no (known) sending event occurrence. True when the continuation is at the end of the enclosing interaction fragment and false when it is in the beginning. Continuation is intuitively similar to labels representing intermediate points in a flow of control. The condition that must be true when evaluated in order for the constraint to be satisfied.Ī Continuation is a syntactic way to define continuations of different branches of an Alternative CombinedFragment. Specifies the allowable cardinalities for an instantiation of concurrent.Ī condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element. It is placed on top of an activation.Ī classifier is a classification of instances. The number of message indicates the order of message within an interaction.ĭetermines whether the message is an asynchronous or a synchronous message.Ī concurrent represents a session of concurrent method invocation along an activation. The set of lifelines contained by the combined fragment.Ī message defines a particular communication between Lifelines of an Interaction.Ĭall message is a kind of message that represents an invocation of operation of target lifeline. The set of operands of the combined fragment. Specifies the operation that defines the semantics of this combination of InteractionFragments.ĭescription of alternative combined fragment. The name of alternative combined fragment. At most one of the operands will be chosen. Through the use of CombinedFragments the user will be able to describe a number of traces in a compact and concise manner.Īn alternative combined fragment represents a choice of behavior. A combined fragment is defined by an interaction operator and corresponding interaction operands. Operations here refers to the operations owned by the actor.Ī combined fragment defines an expression of interaction fragments. Refers to all of the Properties that are direct (i.e., not inherited or imported) attributes of the actor.Īn operation is a behavioral feature of an actor that specifies the name, type, parameters, and constraints for invoking an associated behavior. Set it to make the actor become a "business actor" Indicates whether the actor has no ancestors. If the value is true, then it is not possible to further specialize the actor. Indicates whether it is possible to further specialize an actor. An abstract actor is intended to be used by other actors. If true, the actor does not provide a complete declaration and can typically not be instantiated. Since an actor is external to the subject, it is typically defined in the same classifier or package that incorporates the subject classifier Thus, a single physical instance may play the role of several different actors and, conversely, a given actor may be played by multiple different instances. Note that an actor does not necessarily represent a specific physical entity but merely a particular facet (i.e., "role") of some entity that is relevant to the specification of its associated use cases. Actors may represent roles played by human users, external hardware, or other subjects. Besides, Visual Paradigm can generate sequence diagram from the flow of events which you have defined in the use case description.Īn Actor models a type of role played by an entity that interacts with the subject (e.g., by exchanging signals and data), but which is external to the subject (i.e., in the sense that an instance of an actor is not a part of the instance of its corresponding subject). With the advanced visual modeling capability, you can create complex sequence diagram in few clicks. It shows how the objects interact with others in a particular scenario of a use case. Definition The Sequence Diagram models the collaboration of objects based on a time sequence.
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