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Establishing Connection

Unlike publishing, inquiry is a simpler registry interaction and doesn't require a priori registration with the registry provider. This also means that no authorization token is needed when using inquiry APIs.

The UDDI .NET SDK provides APIs for discovering resources (services, businesses, and tModels) that satisfy certain criteria. To demonstrate use of UDDI Inquiry APIs, let's consider the 401(k) service ecosystem in the UDDI publishing examples.

This example tests the inquiry URL to discover the uddi-org:inquiry_v2 tModel, using the FindTModel class. (There are several UDDI XML messages for different types of discovery, as discussed later in this article. Here, we focus on establishing connection with the inquiry URL.) A C# program segment used for establishing connection for inquiry might look like this:

Inquire.Url = "URL of UDDI registry";
FindTModel ftm = new FindTModel();
Console.Writeln("Searching for tModel
ftm.Name = "uddi-org:inquiry_v2";
TModelList tml = ftm.Send();

Console.Writeln("\r\nThe TModel Name: " +
Console.Writeln("\r\nThe TModel Key: " +

When the Send method of the FindTModel class is invoked, the UDDI .NET SDK APIs interact with the UDDI registry in XML format and receive tModel information on successful connection.

The ecosystem used in the examples consists of two major players:

  • Prudentially 401(k), Inc., a subsidiary of a global financial services conglomerate

  • Financial Interactions and Transactions Standardization Organization (FITSO), a not-for-profit consortium of large financial institutions in North America, including pension fund providers

Prudentially specializes in providing pension fund management services to its clients. The company has established a large clientele through the years and is one of the founding members of FITSO.

FITSO publishes relevant business standards for its members. For the pension fund providers, FITSO has identified the classification scheme and a set of interactions that any compliant service provider must support. The classification scheme is provided by the North American Industry Classification System (NAICS). This taxonomy choice translates to using the NAICS tModel pre-loaded in the UDDI registry. The following interactions should be supported by a FITSO pension fund:

  1. Get list of funds.

  2. Get fund performance.

  3. Add employee to a plan.

  4. Get employee contribution data.

FITSO needs to register a tModel corresponding to this interaction specification. This tModel is called TM401k. Based on this requirement, Prudentially 401(k) registration information is as follows:


UDDI Representation


Entity: Prudentially 401(k), Inc.







Interface Specification


The final category of participants in this ecosystem consists of the member companies that use Prudentially 401(k) service for their pension plans. The details on how to publish these entities and their services in a UDDI registry were discussed in the previous article in this series. Let's see how a customer of Prudentially will use UDDI inquiry APIs to use the 401(k) service effectively.

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