In chapter 4, we discuss the various discovery and publishing schemes available for Web Services. We present a detailed analysis of UDDI, the standard registry framework for publishing services. The API for publishing and discovering services using UDDI is discussed briefly. We present the best practices in using UDDI as discussed in the OASIS Best Practices document. The differences, advantages and disadvantages of keyword, port type and semantics based discovery are presented. The chapter also introduces the reader to the different flavors of semantics in Services life cycle. An approach to publish and discover semantic Web Services is presented. As an insight into the current research, we discuss registry federation towards the end.