In our endeavor to create the Agnostic Composition Controller using probably the most popular SOA pattern, we demonstrated the role of two out of three core SOA operational frameworks, covering Service Creation, Composition, and Governance patterns. Focusing on its most complex realization, based on dynamic service discovery and invocation, we delved into the problem of Metadata Centralization and its relation to message structure and service layering: logical and physical; we cannot disregard these any longer. Building a Service Inventory without a plan in mind will produce results far worse than point-to-point spaghetti. Unfortunately, there is no tool to guide us right after the installation. Only the SOA principles (yes, to a meaningful extent) help us build a practical SOA inventory with a working Governance Reference model.

This chapter is the focal point of this book. First, we will give you a vendor-neutral taxonomy for a Service...