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Understanding Web Services- XML, WSDL, SOAP and UDDI
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SOAP has several main parts:
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Envelope: Defines the start and the end of the message Header: Contains any optional attributes of the message used in processing the message, either at an intermediary point or at the ultimate end point Body: Contains the XML data comprising the message being sent Attachment: Consists of one or more documents attached to the main message (SOAP with Attachments only) RPC interaction: Defines how to model RPC-style interactions with SOAP Encoding: Defines how to represent simple and complex data being transmitted in the message
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SOAP messages contain an envelope, a header, and a body
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Only the envelope and the body are required
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UDDI: Publishing and Discovering Web Services
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After you have defined the data in the messages (XML), described the services that will receive and process the message (WSDL), and identified the means of sending and receiving the messages (SOAP), you need a way to publish the service that you offer and to find the services that others offer and that you may want to use This is the function that UDDI (universal distribution, discovery, and interoperability) provides
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Inside the Enterprise
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Many companies are exploring the potential advantages of using Web services both
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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inside and outside the enterprise This is analagous to using browsers and Web servers inside the enterprise in internal networks Existing internal Web infrastructure can be put to good use in support of Web services style interactions Although unlikely to replace existing distributed computing environments, such as COM and CORBA, Web services can be a valuable supplement to existing technologies Sometimes, all you have is an HTTP or an SMTP connection Because they represent a completely neutral format that can be used to achieve a new level of interoperability, Web services can also be used to bridge across COM, CORBA, EJB, and message queueing environments Finally, because Web services use existing HTTP infrastructure, the impact on system administrators is minimal compared to introducing other distributed computing technologies into an IT department Performance is certainly an issue compared to more traditional binary-oriented transports and protocols, but the potential benefits outweigh the costs for many applications, and performance issues tend to get solved over time, as they have been for the original Web The UDDI framework defines a data model in XML and SOAP application programming interfaces (APIs) for registering and discovering business information, including the Web services a business publishes UDDI is produced by an independent consortium of vendors, founded by Microsoft, IBM, and Ariba, to develop an Internet standard for Web service description registration and discovery Microsoft, IBM, Hewlett-Packard, and SAP are hosting the initial deployment of a public UDDI service, which is conceptually patterned after DNS, the Internet domain name service that translates Internet host names into TCP addresses In reality, UDDI is much more like a replicated database service accessible over the Internet UDDI registers and publishes Web service definitions
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UDDI is similar in concept to a Yellow Pages directory Businesses register their contact information, including such details as phone and fax numbers, postal address, and Web site Registration includes category information for searching, such as geographical location, industry type code, business type, and so on Other businesses can search the information registered in UDDI to find suppliers for parts, catering services, or auctions and marketplaces A business may also discover information about specific Web services in the registry, typically finding a URL for a WSDL file that points to a supplier's Web service UDDI is a directory of Web services
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Businesses use SOAP to register themselves or others with UDDI; then the registry clients use the query APIs to search registered information to discover a trading partner An initial query may return several matches from which a single entry is chosen Once a business entry is chosen, a final API call is made to obtain the specific contact information for the business UDDI uses SOAP for registering and discovering information
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Figure 1-9 shows how a business would register Web service information, along with other, more traditional contact information, with the UDDI registry A business first generates a WSDL file to describe the Web services supported by its SOAP processor (1) and uses UDDI APIs to register
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