June 2003
Intermediate to advanced
984 pages
25h 13m
English
Content preview from UML™ Bible
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CHAPTER 2
UML Architecture
In This Chapter
- Understanding the four-layer architecture approach
- Exploring the structure of UML 1.4
- Examining the key features of UML 1.4
- Exploring the structure of the UML 2.0
- Examining the key features of UML 2.0
In every version of the UML, the authors have applied a four-layer metamodel architecture. Although time pressures kept the original specification's implementation from being all it needed to be for the long term, UML 1.4 successfully adheres to the four-layer concept. The authors of 2.0 have taken great pains to expand on the four-layer approach, and their effort results in an improved implementation of it. I'll step through both UML 1.4 and 2.0 versions after I discuss the significance of the four-layer metamodel architecture.
The Four-Layer Metamodel Architecture
Understanding the four-layer model will be easier if we start with an example using two layers and build up. To do this, though, I need to use Class diagram notation. If you are unfamiliar with this Class diagram notation, you may want to read Chapters 5 and 6 first, and then come back here.
Chapter 1 explained that the MOF is a metamodel, a model that defines the concepts used to build models. When you show the relationship between the metamodel and the model, as in Figure ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.