Managing Megadata.

This section focuses on managing metadata. Metadata is data about data, a secondary thing that's separate in some way from the primary thing to which it refers. Since the birth of software, programmers have embedded one kind of metadata, namely comments, in their source code. Making such comments more integral to software has been a long-standing quest. Comments are an informal kind of metadata used to describe the design and operation of software for human readers. But they can also be used in more formal ways to declare properties of software components and relationships among them. Specifying the invocation style in a comment, rather than in the code, is one way to separate configuration logic from business logic.