MDA Distilled: Principles of Model-Driven Architecture

Design-Time Interoperability

Even with these advances in the level of reuse, we nonetheless have a problem: There's still little reuse of applications.

Over and over, we see systems that are reimplementations of existing functionality built to make use of improved technology, and we see systems that are unable to reuse existing platforms because they've become interwoven with an existing application. Components and frameworks are helping, but there's still significantly more reuse of those closer to the machine. We see more reuse of databases and data servers—general services that rely on implementation technologies—than we see reuse of customer objects, which in turn rely on general services.

Figure 1-3 shows the overall effect. Each line between ...