Pass the OMG OMG Certification OMG-OCUP2-ADV300 Questions and answers with CertsForce

In addition to ObjectFlow, which is used to denote the flow of objects between activities in a UML Activity diagram, data movement can also be facilitated through:

A.Pin is a point on a node that is used to accept or provide objects or data, but does not move data by itself.

B.Correct. Variables can be used to hold and move data within an activity, facilitating state maintenance or transitions between different actions.

C.Property, while it holds data, typically pertains to classes or components, not activities.

D.ControlFlow dictates the order of execution but does not inherently move data.

References:

UML Specification: Activity Diagrams section.

Details on how data can be managed within activities can be explored in the UML 2.5 Documentation, particularly under Activity and Object Nodes.

In UML, the multiplicity of an association end specifies how many instances of the class at that end can participate in a single association. A lower multiplicity of one (1) at one end of an n-ary (where n > 2) association implies that there must be at least one link that combines the values of the other ends, but it doesn't require that a link exists for every possible combination. Therefore, it's possible for some combinations to exist as links, while others do not, which is indicated by the option that links combining the values of the other ends may exist or may not exist. This interpretation is consistent with the definition of multiplicity in associations as outlined in the UML 2.x Superstructure Specification.

Given that the system is inStateA1, the sequence of triggers that will move the system toStateCmust take into account the transitions and their associated triggers as defined in the UML state diagram. Starting fromStateA1, the triggera5will cause a transition withinStateA, followed bya6, which moves toStateA2. The triggera5is not relevant as it is an internal transition inStateA1. Then,a3(the exit action forStateA) anda2would be followed to leaveStateAaltogether. Once out ofStateA,a1is used to transition toStateB, wherea10is an entry action, not a trigger. Finally, to get fromStateBtoStateC, the triggersa11followed bya12are needed. This sequence of triggers reflects the correct usage of exit, entry, and transition triggers as defined by UML state machine semantics.

The provided diagram fragment shows what appears to be Components or Classes with dashed arrows pointing towards them. Typically in UML, a dashed arrow with an unfilled arrowhead represents a Realization relationship, which is used to show that an element (such as an interface) is realized by another element (such as a class or component). However, when we are talking about Classes like "EventRegistration," "MessagePacket," "Attendee," and "Session" which seem to share a common nature or purpose with "EmailServices," these relationships are more appropriately modeled as Generalizations, indicating that they inherit from a common superclass or implement a common interface. Realizations are typically not used in this context.Hence, the dashed arrows in the diagram should be solid lines representing Generalization, not Realization. This answer aligns with the UML 2.x Superstructure Specification, which provides guidance on the usage of Realization and Generalization relationships in class diagrams.

In UML 2, a “critical” section in a sequence diagram, like the one depicted, refers to a period where certain interactions are protected so that they can be executed without interruption or interference from other interactions (events). This is akin to a critical section in multi-threading where certain threads have exclusive access to resources or operations for a period of time. The correct answer is option C because it aligns with this definition: during the “critical” section on the sequence diagram, no other events may interfere between its events.

In UML, a simple State can indeed be redefined, but the specifics of how it is redefined matter:

Ais incorrect as redefinition of States, including simple States, is permitted.

Bis correct. A simple State can be effectively removed or altered through redefinition in a derived StateMachine, which could include changing its type or characteristics.

Csuggests that a simple State can be turned into a composite State. While theoretically possible in the context of redefinition, this option might be considered a significant alteration that could be misleading without additional context.

Dis incorrect; UML does support State Redefinition.

References:

UML Specification, particularly the sections on Redefinition and StateMachines.

Detailed rules on state redefinition are outlined in the UML 2.5 Documentation, specifically under StateMachine specializations.

The class templateListshown in the diagram fragment is a parametrized class with two template parameters:Tandn. The signature of the class template includes both of these parameters. The template parameterTrepresents a type that can be bound to a specific class when the template is instantiated, whilenrepresents an integer value that specifies the multiplicity of elements that can be contained in the list. Therefore, the signature of the class templateListis the ordered set{T, n: Integer}, which includes both the type parameterTand the integer parameternindicating the maximum number of elements the list can hold.