"Since its release, UDDI has been widely criticized for its implementation, and its relevance questioned repeatedly at this stage of Web services architecture development. Created by a group of IBM and Microsoft engineers and released in November 2001, WSIL is significant because of its simpler document-based approach, which is more lightweight and straightforward and better leverages existing Web architectures. This approach could lead to this specification's rise to prominence," says Timothy Appnel in this OReilly OnJava.com article: