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based on XML, SOAP, and WSDL extensibility models. Together, these specifications define a set of composable features to make Web services secure, reliable, and transacted, as the standard tag line often reads. Composability refers to the fact that you can pick and choose the selected specifications that apply to your particular business scenario. None of the specifications are ever required, even the security specifications. Though as they become more widely accepted, it is likely that a subset of the specifications will be required in any robust, businessquality Web service. The WS-Specifications are incredibly important to the future of Web services technology and to service-oriented architecture. Microsoft provides a set of tools for .NET called the Web Services Enhancements (WSE). WSE includes managed APIs for implementing selected WS-specifications in a composable manner. I say selected because the WS-Specifications continue to evolve, and it will take time for all of the current standards to be submitted, accepted, and then incorporated into Web Services Enhancements. New WS-Specifications continue to be released, so the future promises to hold many interesting and important developments in this evolving technology. This chapter lays the groundwork for the second half of the book, where I will focus intensively on how to implement the WS-Specifications using Microsoft s Web Services Enhancements 2.0 for .NET. This chapter includes the following: Overview of the WS-Specifications Introduction to Web Services Enhancements 2.0 Installing and configuring WSE 2.0, including the test certificates Using the WSE 2.0 utilities This chapter is a must read in order to get the most out of the second half of the book. It will help you to understand the WS-Specifications, and how WSE fits into the context of service-oriented architecture. It will also get you started with installing and configuring Web Services Enhancements 2.0, including the test certificates, which are required for many of the code samples.
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Overview of the WS-Specifications
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The purpose of the WS-Specifications is to establish a set of standards for enterprise-level, service-oriented Web services. The focus of the specifications is on Web services in general, and on messages in particular, because messages are the essential aspects of a service-oriented architecture. Without messages, Web
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services cannot communicate. And without secure, reliable messages, businesses will never trust that they can send sensitive information between Web services. The integrity of the message is the key to gaining acceptance for Web services as a robust business solution. Each of the WS-Specifications addresses a different business-critical issue. For example, WS-Security addresses how to implement digital signing and encryption technology in Web services. WS-Reliable Messaging addresses how to ensure that messages are always delivered, even if one part of the system is temporarily unavailable. Each specification is recorded directly in the header of the applicable SOAP message, using a dedicated XML schema. Some specifications, such as WS-Security, also modify the body of the SOAP message for encryption. Listing 5-1 shows one example of a SOAP message that implements multiple specifications, including WS-Addressing, WS-Security, and WS-Reliable Messaging. Notice that the message header is divided into distinct parts, and that the individual specification schemas do not overlap. This is known as composability because the individual specifications may be added or removed from the message header as needed. Listing 5-1. SOAP Message Illustrating Web Service Composability
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<s:Envelope xmlns:S="http://www.w3.org/2002/12/soap-envelope" xmlns:wsa=http://schemas.xmlsoap.org/ws/2003/03/addressing xmlns:wsse=http://schemas.xmlsoap.org/ws/2003/03/security xmlns:wrm="http://schemas.xmlsoap.org/ws/2003/03/reliablemessaging"> <s:Header> <! WS-Addressing --> <wsa:From> <wsa:Address>http://www.bluestonepartners.com/Buyer</wsa:Address> </wsa:From> <wsa:ReplyTo> <wsa:Address>http://www.bluestonepartners.com/Broker</wsa:Address> </wsa:ReplyTo> <wsa:To>http://www.bluestonerealty.com/Seller</wsa:To> <wsa:Action>http://www.bluestonerealty.com/MakeOffer</wsa:Action> <! WS-Security --> <wsse:Security> <wsse:BinarySecurityToken ValueType="wsse:X509v3" EncodingType="wsse:Base64Binary"> JKH8dH7SJa8.......SKJa87DJsAK3 </wsse:BinarySecurityToken> </wsse:Security>
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<! WS-ReliableMessaging --> <wrm:Sequence> <wsu:Identifier>http://www.bluestonerealty.com/mls123</wsu:Identifier> <wrm:MessageNumber>32<wrm:MessageNumber> </wrm:Sequence> </s:Header> <s:body xmlns:po= "http://www.bluestonerealty.com/PurchaseHouse"> <po:PurchaseHouse> ... </po:PurchaseHouse> </s:body> </s:Envelope>
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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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