OMG OMG-OCUP2-FOUND100 Exam With Confidence Using Practice Dumps

In UML sequence diagrams, a signal is typically represented as an asynchronous message without a return value. Asynchronous messages are often denoted with an open arrowhead, and they can represent the sending of a signal.

Looking at the diagram provided, 'p' is sent from 'v2[C]' to 'v3[B]' with an open arrowhead, which indicates that it is an asynchronous message. This fits the common representation of a signal, as it does not expect a response.

'A', 'B', and 'C' do not represent signals in the context of a sequence diagram: A) 'v' is not shown in the diagram; it might refer to a lifeline, which is not a signal. B) 'B' refers to a class or object type and not a message or signal. C) 'm' is represented as a synchronous message (as it has a return arrow), which is not typical for signals.

Therefore, the correct answer is:

D. p

In UML 2, a structured class can have internal parts, which are depicted using 'parts' or 'roles' within the class diagram. These internal parts are used to show the composition of the class in terms of contained classes or components. In the context of the question, the structured class named 'System' contains two parts named 'Subsystem1' and 'Subsystem2'.

Option C is the equivalent definition of 'System' in terms of UML 2 notation for several reasons:

• It represents the structured class 'System' with internal parts correctly labeled as 's1:Subsystem1' and 's2:Subsystem2-[ ]', which indicates the role names 's1' and 's2' followed by the class type 'Subsystem1' and 'Subsystem2' respectively. The notation '1..*' after 's2:Subsystem2-[ ]' suggests a multiplicity, meaning that there can be one or many instances of 'Subsystem2' associated with 'System'.
• The compartmentalization within the structured class is indicative of the composition of the 'System', showing that 'Subsystem1' and 'Subsystem2' are integral parts of the 'System'.
• The notation conforms to the standard UML 2 representation for composite structures, as described in the UML 2 Superstructure Specification, where a class can be broken down into its constituent parts within the class rectangle.

This information is verified against the UML 2 Superstructure Specification, which is the authoritative source for UML notation and semantics. Particularly, this aligns with section 9.3.5 on Composite Structures Diagrams, which details the graphical notation for parts and roles within a structured class.

In UML, the «extend» relationship indicates that the behavior defined in the extending use case (the extension) can be inserted into the behavior defined in the extended use case (the base). The extension occurs only under certain conditions, which are specified by the extension points. This relationship allows for the addition of optional behavior to a use case, which can be activated under certain conditions.

The diagram provided shows an extension relationship where "Charge credit card" and "Pay with PayPal" are extending "Charge account" use case at the "Charging" extension point.

The key benefit of using the «extend» relationship in this context is that it allows for the flexible addition of new behaviors (like new payment methods) without modifying themain use cases. It helps in evolving the system by adding optional behaviors that only occur under certain conditions, which is mentioned as an option:

C. This Use Case model could be updated with further payment methods without changing the main Use Cases "Book a car" and "Charge account".

This means that new payment methods could be incorporated as additional extending use cases in the future, just like "Charge credit card" and "Pay with PayPal".

The other options do not correctly describe the use of the «extend» relationship: A) «extend» relationships do not replace the need for behavior descriptions such as activities. B) It's not about functional decomposition; it's about adding optional or conditional behavior. D) «extend» is not a taxonomic relationship and does not extract general descriptions into a super Use Case; rather, it adds behavior under certain conditions.

Therefore, the correct answer is:

C. This Use Case model could be updated with further payment methods without changing the main Use Cases "Book a car" and "Charge account".