SOAP UDDI is a reference implementation of the UDDI specification. With this UDDI Registry, Web services developers can publish and test their applications in a secure, private environment for their own applications. UDDI Registry supports multiple users in various department- or company- wide scenarios. It also supports the 20 SOAP- based APIs defined by version one of the UDDI specifications, and it provides persistence for published entities through a relational database. A GUI client application is included that supports publishing and querying of businesses, services, and other UDDI-compliant entities without programming.