Chapter 2. Defining Logical Data Units

When defining a service, the first thing you must consider is how the data used as parameters for the exposed operations is going to be represented. Unlike applications that are written in a programming language that uses fixed data structures, services must define their data in logical units that can be consumed by any number of applications. This involves two steps:

This chapter discusses the first step. Chapter 3, Defining Logical Messages Used by a Service discusses the second step.