|Lesson 4|| How the UML is being refined and extended |
|Objective||What is the current status of the UML standard? |
From the outset, the UML was designed to be a public resource. It grew out of a long list of competing notations and methods
and continues to be extended and refined.
The UML standard is open for review and change by anyone who wishes to contribute to it.
OMG Web Site
The OMG is coordinating feedback and incorporating changes into each new release.
The OMG Web site can be reached at the following Link OMG
UML standard will change over time
The UML standard will change over time, resulting in occasional inconsistencies between the most recent changes and the current
course content. Also, the interpretation of the notation can vary from author to author. If you find such a discrepancy, please
post a message in the Discussion area by clicking the Discuss button in the toolbar.
Extending the models
In addition, the language itself provides some built-in tools for extending the models. One such tool is the concept of
stereotypes. A stereotype is a way of describing an element without specifying its implementation. Job titles provide a similar
function for people. For example, the job title "Developer" is a general description for a broad range of jobs. An
individual with that title may be a Java, C++, or Visual Basic programmer on a specific project with specific duties that make
that job completely unique, and yet the title still provides a meaningful understanding of the general function.
Likewise, classes and other modeling elements may be stereotyped according to the type of entity they describe.
For example, when referring to classes, user interfaces, device drivers, schedulers, and error handlers all have unique types of behavior.
Using stereotypes helps people grasp the role of each modeling element without having to investigate the implementation details.
This form of extension provides customized interpretation of the models without changing the UML standard.
UML Overview - Quiz
In the next lesson, you will learn how the diagrams in the UML are organized to facilitate their use.
Click the Quiz link below to take a short quiz about the material we have just covered.
UML Overview - Quiz