PDF OMG-OCUP2-ADV300 Study Guide

The capability that enables the discovery and manipulation of metaobjects and metadata is Reflection. In the context of the Meta-Object Facility (MOF), reflection allows you to examine and interact with the structure and semantics of metamodels, models, and their elements. It provides a way to introspect and dynamically access information about the modeling constructs, such as classes, attributes, relationships, and constraints.

A template signature in UML specifies a set of formal parameters that can be substituted by actual parameters when a template is instantiated. This template signature is part of a templateable element, which is the element that can be parameterized using the template mechanism in UML. The template signature defines the formal template parameters that will be replaced by actual values or types when a bound element is created from the template. This concept is detailed in the UML 2.x Superstructure Specification, particularly in the sections describing templates and how they are used to create reusable and customizable model elements.

The correct answer is B, which uses a selection edge to specify task behavior based on task priority. In UML, an object flow with a selection property is used to select objects from a collection according to some criterion, which is typically represented by a Boolean expression. In the case of B, the selection criterion is described as "ordering = the most important first", indicating that tasks are selected to be executed based on their priority.

References:

• UML 2.5 Specification: The UML 2.5 specification describes how selection behaviors can be applied to object flows to filter objects according to specific criteria, such as priority in this scenario.

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.