OMG OMG-OCUP2-ADV300 Exam Dumps - Actual Questions Answers

A minimal reflexive metamodel is a metamodel that is expressed using itself, meaning it can be used to describe its own structure and semantics. This concept is akin to a self-describing system. In the domain of metamodeling, this allows for a consistent and coherent definition of the metamodel that is both the subject and the tool of its own description2. This reflexivity is a key property that enables the metamodel to be used in a variety of contexts, ensuring that it remains consistent with its own definitions.

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.

The approach described in option B aligns with the concept of template classifiers in UML, which allows for the creation of parameterized elements that can be instantiated with different arguments. By modelingVehicleas a template classifier with a parameter namedThrustor, other modelers can instantiate this template with their chosen propulsion system, as long as it is a type that specializes thePropulsionSystemabstract class. This method provides the flexibility needed for modelers to tailor theVehicleclass to different propulsion systems while enforcing that only derivatives ofPropulsionSystemcan be used as the actual parameter forThrustor. This tactic of using template classifiers and class parameters is an application of UML's syntax and semantics for creating modular and customizable models. This practice is detailed in the UML 2.x Superstructure Specification, particularly in the sections describing template classifiers and their parameters.