OMG-OCUP2-FOUND100 Exam Questions

In the given UML package diagram fragment, various elements are listed with stereotypes indicating their nature (class, interface). Stereotypes are used in UML to extend the vocabulary of UML in order to create new kinds of building blocks. They are typically enclosed in guillemets ( ).

The last element, 'six', does not have a stereotype indicating whether it's a class, interface, or some other kind of element. This lack of a stereotype leads to ambiguity about the nature of 'six'. Therefore, the fragment is considered invalid due to this omission.

All the other options do not constitute an error in the UML fragment: A) A list of elements is allowed in a package body. B) Visibility is not required for every element, especially within package diagrams. C) Interfaces are allowed in packages. D) Private elements are allowed in a package. E) Protected elements are also allowed in a package.

Therefore, the correct answer is:

F . Element six is missing its stereotype.

The image depicts a state machine with three states labeled 'state1' and 'state2'. Three events, e1, e2, and e3, are shown triggering transitions.

Analyzing the diagram, we can observe that all three events (e1, e2, and e3) are required for the transition from state1 to state2. The events are arranged sequentially, implying a specific order for the transition to occur.

Here's a breakdown of the reasoning for excluding other options:

Option A (When all of el. e2. and e3 occur in any order) is incorrect because the order of events matters.

Option B (When any one of the events e1. e2. or e3 occurs) is incorrect because all three events are necessary for the transition.

Option D (Never, because a transition cannot have more than one trigger) is incorrect because the state machine can transition with multiple triggers, but in this specific case, the order is crucial.

Therefore, based on the visual representation of the state machine, the correct answer is that the transition to state2 happens only when events e1, e2, and e3 occur in precisely the specified order

The diagram likely represents a UML activity diagram, which is used to model the workflow of a system. The correct answer is D because it reflects the behavior of decision nodes and concurrent flows in UML activity diagrams.

In UML, when an activity reaches a decision node (depicted as a diamond), it chooses one among several alternative flows. In this case, after the completion of action A, the flow must decide between B or D, but not both, which is a fundamental aspect of decision nodes in UML. This is supported by the UML 2.5 specification, which states that a decision node routes tokens to one of the available outgoing edges based on the conditions evaluated at runtime, ensuring that only one path is taken.

Furthermore, the UML specification explains that the notation for decision nodes and the semantics of token flows are such that they support the modeling of conditional and concurrent behaviors within an activity. This is essential for accurately capturing the logic of complex systems and their operations.

For a more in-depth understanding, you can refer to the UML 2.5.1 specification provided by the Object Management Group (OMG), which details the notation and semantics of activity diagrams, including decision nodes and flows. Additionally, studying the official OMG UML 2 Certification Guide can provide further clarification on these concepts.

Represent the movement of data or objects between activities.

Can support multicast, meaning sending a single token to multiple recipients.

Can support transformation, where input tokens are altered or transformed into different output tokens.

Control Flows

Represent the sequence of execution between activities.

Generally carry control tokens to indicate when the next activity can begin.

Explanation for why Answer B is Correct

Multicast and Transformation:Object flows are specifically designed to handle more complex scenarios with multiple inputs, outputs, and the ability to transform data. Control Flows are focused on the order of execution and don't directly support these capabilities.

Analysis of Other Options:

A . Both object flows and control flows can pass...: While both can carry tokens, the specializations of multicast and transformation are unique to object flows.

C . Only control flows provide additional support...: This is incorrect. As mentioned above, these features are associated with object flows, not control flows.

D . Only object flows may reorder...: This is potentially true, but less central to the main difference between object flows and control flows, which is the ability of object flows to support multicast and transformation.

Reference

UML 2.5.1 Specification (Superstructure): Sections on Activity Diagrams, Object Flow, and Control Flowhttps://www.omg.org/spec/UML/2.5.1/