Describe the basic functions provided by the UDDI Publish and Inquiry APIs to interact with a UDDI business registry.

  • [UDDI_2] UDDI Version 2 API Specification.


The SCDJWS 5.0 exam questions are based on the UDDI Version 2 specification.

Two types of UDDI APIs are defined. A publisher's API is provided for interactions between programs and the UDDI registry for the purpose of storing or changing data in the registry. An inquiry API is provided for programs that want to access the registry to read information from the registry.

Authenticated access is required to use the publishers API. Each Operator Site is responsible for selecting and implementing an authentication protocol that is compatible with the publishers API, as well as providing a new user sign-up mechanism. Before using any of the publisher API functions, the caller is responsible for signing up with one or more Operator Sites or compatible registries and establishing user credentials.

The Inquiry and Publishers API functions are exposed as SOAP messages over HTTP. HTTPS (specifically SSL 3.0) is used for all publisher API calls in order to assure wire privacy. No authentication is required to make use of the Inquiry API functions.

SOAP is a method for using Extensible Markup Language (XML) in message and remote procedure call (RPC) based protocols. SOAP has been jointly defined and submitted to the World Wide Web consortium (W3C) as a note.

UDDI uses SOAP in conjunction with HTTP to provide a simple mechanism for passing XML messages to Operator Sites using a standard HTTP-POST protocol. Unless specified, all responses will be returned in the normal HTTP response document.

The general structure of a UDDI SOAP message:

POST /someVerbHere HTTP/1.1
Content-Type: text/xml; charset="utf-8"
Content-Length: nnnn
SOAPAction: "" 

<?xml version="1.0" encoding="UTF-8" ?>
<Envelope xmlns="">
    <xxx_xxx_xxx generic="2.0" xmlns="urn:uddi-org:api_v2">

Inquiry API functions

The messages in this section represent inquiries that anyone can make of any UDDI Operator Site at any time. These messages all behave synchronously and are required to be exposed via HTTP-POST only. Other synchronous or asynchronous mechanisms may be provided at the discretion of the individual UDDI Operator Site or UDDI compatible registry.

The publicly accessible queries are:

Publish API functions

The messages in this section represent commands that require authenticated access to an UDDI Operator Site, and are used to publish and update information contained in a UDDI compatible registry. Each business should initially select one Operator Site to host their information. Once chosen, information can only be updated at the site originally selected. UDDI provides no automated means to reconcile multiple or duplicate registrations.

The messages defined in this section all behave synchronously and are callable via HTTP-POST only. HTTPS is used exclusively for all of the calls defined in this publisher's API. The publishing API calls defined that UDDI operators support are:

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