XML Reference Guide

Mar 14, 2003

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If you build a web service and nobody accesses it, have you really built anything?

In other words, once you have your web services built and ready for users, how do you let people know about it? The answer is the Universal Description, Discovery, and Integration (UDDI) Business Registry.

UDDI is a protocol and structure that enables business owners to register themselves, their companies, and their available services so that potential users can find them. A UDDI registry includes information on the "business entity", or company itself, as well as one or more contacts and any available services. For services, a UDDI registry includes a "technical model", also known as a tModel, which points to information a designer needs in order to build a client to access the service, as well as a separate "instance info" item, which might include information such as a WSDL file.

For example, if you sold widgets and you provided a widget lookup service and a widget purchase service via a SOAP web service, you could register your company with a UDDI registry. Users looking for widgets could then find your information and choose from the potential ways to contact you. They might use the business entity information to write to you, or choose a contact and call you, or look at the tModel and, discovering a WSDL file that describes the service, automatically generate a client.

A UDDI registry is useful because it enables users to find a service based on the company, the industry, or the type of service being offered.

When you're dealing with UDDI, it's important to understand which UDDI registry you're dealing with. "The" UDDI registry typically refers to the UDDI Business Registry, a group of global registries run by companies such as Microsoft and IBM. These are meant to be a single repository, and information is mirrored between these nodes at various intervals. To publicize your service to the world, this is where you'll want to list it.

On the other hand, UDDI can also be used locally. For example, it's been built into Microsoft Windows 2003 as an optional service, enabling you to publish and share web services easily within your organization.

Services are normally designed either for machine or for human access, but UDDI is interesting because you can easily do both. By visiting the UBR, you can enter information in a human-readable form explainign what information you're looking for. You can search by company name, by service, or by other information such as the companys D.U.N.S. number. Once you've located the company or the service, you can get more information, such as the WSDL file, if it's been added to the registry.

On the other hand, UDDI has been designed with an eye toward programmatic access. Both Java and C# have tools that enable you to easily access the database, as you can see in the resources. In fact, some tools, such as IBM's WebSphere Studio Application Developer (and its open-source version, Eclipse) and Visual Studio.NET, have been specifically designed to use UDDI, so you can easily integrate it into your web services strategy.

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