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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
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As you can see, each of the specifications is encapsulated within the SOAP header and each supports distinctive element tags so that no specification information can conflict. Web service composability is essential for allowing developers to choose which specifications are important for their Web services. In addition, this feature keeps message payloads smaller in size by not including element tags for unused specifications.
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Introducing the WS- Specifications
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Instead of simply listing the various WS- specifications, it is more useful to present them in the context of the framework s goals. There are different perspectives on what the full set of goals are because the specifications are always evolving and are being drawn together by diverse coalitions of companies and organizations. But in our minds, there are six primary goals for the WS- specifications.
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Interoperability
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Web services must be able to communicate even if they are built on and operated on different platforms. Web service messages must use standard protocols and specifications that are broadly accepted, such as the WS-I Basic Profile, which includes XML, SOAP and WSDL. Inter, operability is the key to widespread acceptance of Web services for handling critical business processes.
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This is a design principle that is fundamental to the WS- specifications. The term composability alludes to the fact that many of the WS- specifications are independent of each other and that a given Web service may not need to implement them all. For example, one Web service may require security but not reliable messaging. Another Web service may require transactions, but not policy. Composability allows a developer to implement only those specifications that are required. The WS- specifications support this because they are implemented as discrete sections within the SOAP message header (see Listing 5-1 for an example).
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Protocol-level security mechanisms such as HTTPS are currently in wide use, but they are designed for point-to-point security rather than message-oriented security, which is much more dynamic. The WS-Security specification is a message-oriented security solution that supports the dynamic nature of messages. With WS-Security, the security information is stored directly in the message header, so it stays with the message, even if the message gets routed to more than one endpoint. Messages must carry their security information with them so they can remain dynamic. The WS-Trust and WS-Secure Conversation specifications enable you to create a secure token service that procures security tokens for the duration of a specific conversation between a client and a Web service.
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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
Description and Discovery
Web services may be accessed from different clients across different domains. Web services must therefore be capable of publishing their metadata so that potential clients know how to call them. The WSDL document publishes supported types, operations, and port information. The WS-Policy specification documents and enforces usage requirements and preferences for a Web service. For example, WS-Policy will enforce that incoming SOAP requests must be signed and encrypted with digital certificates only, rather than any type of security token. The UDDI specification aims to provide a mechanism for clients to look up Web service metadata in a centralized directory.
Messaging and Delivery
The biggest vulnerability for a message besides security is the risk that it may never reach its intended destination or worse, that not only does the message fail to reach the destination, but the sender is also unaware that it never arrived. You cannot correct a problem if you do not know it occurred. The WS-Reliable Messaging specification establishes a framework that is designed to keep all parties informed of where messages are and whether they arrived. This is critical in an architecture where a message may get routed between multiple endpoints. Failure at one endpoint should not bring down the entire workflow that the message is a part of.
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