OMG-OCUP2-ADV300 Exam Dumps : OMG Certified UML Professional 2 (OCUP 2) - Advanced Level

In the MOF class hierarchy, the class ‘Element’ sits at the top. It is the superclass of all classes defined in MOF and is an implicit superclass of all metaclasses defined using MOF1. This superclass relationship to ‘Element’ does not need to be explicitly declared in the metamodels.

The UML (Unified Modeling Language) specification, which is a part of the MOF (Meta-Object Facility) framework, suggests that the choice between creating a MOF-based metamodel and a UML profile depends on the specific needs of the domain being modeled. A MOF-based metamodel might be more appropriate for domains that require defining a completely new set of modeling concepts, whereas a UML profile is suitable for domains where the extension ofexisting UML concepts is sufficient. Since the specification recognizes the variability in modeling requirements across different domains, it emphasizes the importance of understanding the domain to make an informed decision on the modeling approach. The UML specification, therefore, does not prescribe a one-size-fits-all solution but rather leaves the decision to the modeler, based on the domain-specific requirements.

The value of Essential MOF (EMOF) lies in its ability to provide a straightforward framework for mapping MOF models to implementations such as XML Metadata Interchange (XMI) for simple metamodels2. This allows for easier integration and manipulation of MOF models in various platforms and tools.