4.1. Chapter Overview

• There are many interpretations of Web Services architecture, which range from product architecture to philosophical models.

• A good Web Services architecture provides a framework to systematically define components that can support different levels of Quality of Services (“ilities” based on individual requirements).

• A reference architecture for Securities Trading is used to illustrate how a deployment architecture is derived from a meta-architecture, with UDDI Service Registry and XML-RPC-based Web Services in the back-end.

• A comprehensive architecture framework also helps when selecting the appropriate tools to enhance productivity during the development and deployment life cycle (for example, Web Services load testing).

• Small code snippets (Web Services design patterns) can be added to the SOAP server side to provide caching, logging, and session control.

• There are different types of UDDI Service Registry. Usually the deployment architecture varies for public and private UDDI registries.

• General troubleshooting guidelines for XML-RPC-based Web Services are discussed, in conjunction with Web Services tools.