5, Finding Web Services: UDDI Registry in .NET framework

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5, Finding Web Services: UDDI Registry
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The initiative for universal description, discovery, and interoperability (UDDI) produces specifications and an active implementation of a repository for Web services descriptions The UDDI registry can be searched using various categorization criteria to obtain contact information for businesses offering services of interest UDDI provides a publicly accessible means to store and retrieve information about Web services interfaces and implementations This chapter describes the UDDI data formats and the SOAP APIs used to store and retrieve information from UDDI This chapter also provides background on the UDDI organization that sponsors the physical registry and the process by which UDDI specifications and technologies are moving toward adoption The Web needs something like UDDI to provide a clearinghouse for Web services information so that publishers and consumers can find each other Only then can the true value of Web services be realized: when Web services consumers can easily and quickly locate and begin accessing Web services implementations anywhere in the world
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Page 5
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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6, An Alternative Approach: ebXML
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The electronic business XML (ebXML) initiative was started around the same time that the Web services community began to grow For the first several months, ebXML was an entirely separate and parallel effort Many of the goals of ebXML are common to Web services, and many of the technologies overlap in concept In general, however, ebXML is focused more at the industrial or enterprise computing level, addressing as the top goal the issue of business process definition This chapter explains the background, goals, and origin of ebXML and covers the ebXML architecture in detail Individual specifications are described and placed into their proper context within the overall architecture The ebXML architecture includes many of the same things as the core Web services technologies but goes beyond them in defining quality-of-service requirements for reliable messaging, security, and trading-partner negotiation Beginning as a replacement for EDI, ebXML seeks to avoid some of the problems with EDI implementations and acceptance, especially in smaller businesses
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7, Web Services Architecture: Additional Technologies
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After the core Web services technologies are implemented and adopted, a whole range of additional technologies is needed to enable Web services to address complex and critical application requirements Businesses will need to secure their Web services against unauthorized use, to guarantee that their SOAP messages arrive at their intended destinations and are processed reliably, and to define and execute automated business process flows according to a standard mechanism This chapter describes these and other technologies in the context of the vendor and industry initiatives in which they are likely to progress toward adoption In some cases, competing proposals vie for adoption, and the leading candidates are discussed The chapter also includes descriptions of two technologies on which many Web services concepts are based: RosettaNet and XML-RPC
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8, Implementing Web Services
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Web services specifications and technologies are not meaningful or particularly useful without implementations in software vendor products This chapter summarizes the major architectural approaches to Web services implementation, describes the major development communities of NET and J2EE, and presents information supplied by BEA Systems, Cape Clear, IBM, IONA, Microsoft, Hewlett-Packard, Oracle, Sun Microsystems, and Systinet on their current product offerings and views of the future Some vendors tend to view Web services implementations primarily within the context of their existing products, as additional clients or adapters into and out of the existing application servers, database management systems, and middleware systems Other vendors seek to mine the value of the Web services layer itself, where multiple, disparate software system domains are put into relationship and integrated Other vendors offer products in multiple categories, including some aimed purely at providing an implementation of Web services standards as well as some aimed at exposing Web services interfaces to existing products Although vendors tend to agree on the adoption and wide spread implementation of the core standards, very little, if any, agreement exists at the next level; that is, what should come next Security, transactions, process flow, and reliable messaging are all part of various vendors' plans but in somewhat differing orders and levels of importance
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