Redwood Shores, Calif.--Oracle Corp. has joined the group defining UDDI, or Universal Description, Discovery and Integration , which aims to create a yellow pages for b-to-b e-commerce. The effort, originally announced and led by Microsoft, IBM and Ariba-each of which are running the first UDDI registries--is viewed as an important step in broadening the reach of e-business. Oracle, whose best-selling database is run by many of the world's largest companies, was the lone major hold-out until now. Oracle said it joined the project when it was given assurances its rivals would make the process and resulting technology less proprietary. Another key holdout, Hewlett-Packard, joined the effort several weeks ago.