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A registry allows organizations to publish and discover Web services. Currently, two registry standards dominate: UDDI (Universal Description, Discovery, and Integration) and ebXML. With either of these, businesses can publish a set of Web services so their internal or external business partners can discover them. However, integrating Web services' discovery and registration regardless of the supported registry standard can prove challenging for businesses. For example, suppose some of the ACME company's multiple business partners published their services in a UDDI registry, while others published in an ebXML registry. How does an ACME Web service application discover those services published by all its business partners? What if ACME wants to publish its services to both UDDI and ebXML registries from within a single Web service application?
JAXR, the Java API for XML Registries, provides a standard API for publication and discovery of Web services through underlying registries. Currently, JAXR is included in the Java Web Services Developer Pack (JWSDP) 1.0 and the recently released Java XML Pack, Summer 02 Release. Additionally, JAXR will play an integral part in J2EE (Java 2 Platform, Enterprise Edition) 1.4. Scheduled for release in early 2003, J2EE 1.4 will be the platform of choice for Web services development and deployment, and compliant vendors will need to provide this API's implementation as an integrated feature in their applications.
In this article, we describe JAXR's architecture and programming models through example code. We explain important registry
operations such as publication and discovery of
Services, usage of
ClassificationSchemes. Note: We give special attention to UDDI programmers.
Most business-to-business interactions are collaborations between two parties who engage in a partnership. These business partners share a registry, often in the form of a Web-based service. A registry typically functions as electronic Yellow Pages, where information about businesses and the products and services they offer are published and discovered. A registry can also serve as a database or store shared information, information that can encompass anything. A registry can also work as an electronic bulletin board in which the partners share information in a dynamic and ad hoc fashion. As described in the JAXR specification, information examples include generic event notification, price changes, discounts, and promotions.
What typical operations do registry-service clients perform? Submitting and storing shared information are important registry operations. Clients also need to complete various registry management operations, such as identifying, naming, describing, classifying, associating, grouping, and annotating registry metadata. Finally, clients also must be able to query, discover, and retrieve shared information from the registry and expect that a typical registry support most of these operations.