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Encoder PDF417 in C#.NET Introducing the WS-Specifications

Introducing the WS-Specifications
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I introduce you to the WS-Specifications again in 5, and then cover them in detail in the remaining chapters of the book. Briefly, here is a summary of the most important WS-Specifications and their purpose:
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WS-Security: A wide-ranging specification that integrates a set of popular security technologies, including digital signing and encryption based on security tokens, including X.509 certificates. WS-Policy: Allows Web services to document their requirements, preferences, and capabilities for a range of factors, though mostly focused on security. For example, a Web service policy will include its security requirements, such as encryption and digital signing based on an X.509 certificate. WS-Addressing: Identifies service endpoints in a message and allows for these endpoints to remain updated as the message is passed along through two or more services. It largely replaces the earlier WS-Routing specification. WS-Messaging: Provides support for alternate transport channel protocols besides HTTP, including TCP. It simplifies the development of messaging applications, including asynchronous applications that communicate using SOAP over HTTP. WS-Secure Conversation: Establishes session-oriented trusted communication sessions using security tokens. WS-Reliable Messaging: Provides mechanisms to help ensure the reliable delivery of messages, even when one or more services in the chain are unavailable. This specification includes message delivery notifications so that a sender knows whether a receiver has successfully obtained a sent message. The WS-Specifications are constantly evolving as new specifications get submitted and existing specifications get refined. However, the core set of specifications presented here will likely continue to form the cornerstone of specifications for some time to come, since they address essential requirements for service-oriented applications.
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Introducing Web Services Enhancements
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Web Services Enhancements (WSE) provides developers with .NET managed assemblies for implementing the WS-Specifications in conformance with the WS-I Basic Profile. WSE is an evolving product and does not currently support all of the Web service specifications, but it does support many important ones, such as WS-Security and WS-Policy. Keep in mind, though, that even currently supported specifications will continue to evolve in future releases of WSE. In some cases, this is because the specification is currently only partially implemented in WSE.
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Introducing Service-Oriented Architecture
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At a more conceptual level, WSE currently exists to provide additional infrastructure support for SOA solutions, beyond what is already provided by the .NET Framework. Microsoft chose to put WSE on a different release cycle than its .NET Framework releases, so that it would have the flexibility to vary the release schedule. Recall that SOA is governed by a number of technology standards and specifications that are themselves going through changes. WSE has to be on a flexible release cycle in order to keep up with the newer versions of these technology standards. WSE is introduced again in 5, and is also the focus of the second half of the book, where I will cover the various WS-Specifications in detail. WSE is what allows you to code several of the WS-Specifications in message-oriented, service-oriented .NET applications.
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This chapter introduced the main concepts behind service-oriented architecture (SOA), which refers to distributed applications based on Web services technology. I defined what a Web service actually is, within the context of SOA, and reviewed the main aspects of SOA architecture. I briefly introduced the WS-I Basic Profile, the WS-Specifications, and Web Services Enhancements (WSE), all of which are covered in detail in the second half of the book starting with 5.
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The Web Services Description Language
WEB SERVICES are formally and fully described using an XML-based document called the Web Service Description Language (WSDL) document. The WSDL document communicates metadata information about the Web service to potential clients and shows them what operations (methods) the Web service supports and how to bind to them. Visual Studio .NET automatically generates WSDL documents for your XML Web services and uses them behind the scenes, although it conveniently allows you to avoid opening the actual WSDL documents. WSDL documents are, for example, used by Visual Studio .NET when you select the Add Web Reference menu option, to allow your project to use the methods of an outside Web service. In a service-oriented architecture (SOA), the WSDL document is a critically important document, and one that you will need to understand in detail so that you can exert tighter control over the Web services that you develop. This is because development tools such as Visual Studio .NET create the most generic WSDL documents with bindings for the SOAP protocol only. Web services can exchange messages over several different protocols in addition to SOAP, including HTTP POST, HTTP GET, and SMTP. However, keep in mind that SOAP is the most suitable protocol for exchanging complex XML-based messages. If you have built a true service-oriented Web service, then these messages cannot, for example, be represented using simple URL arguments as are used by the HTTP GET protocol. You can use the HTTP POST protocol to exchange XML messages, but XML is not qualified with namespaces, nor does it provide the organized SOAP structure that is so critical to technologies such as WSE 2.0. You can see a comparison between the messages exchanged over SOAP versus HTTP POST by browsing a Web service directly. Visual Studio .NET generates a generic input page for each Web method that shows you how the exchanged input and output messages will be generated. WSDL documents fully describe a Web service, including the operations that it supports, the messages that it exchanges, and the data types that these messages use (both intrinsic and custom). The best way to approach a WSDL document is to understand that different XML elements take responsibility for describing different levels of detail. For example, the <messages> element is a detailed listing of the types that factor into a given message. On the other hand, the <operation> element simply lists the messages that factor into a given operation, without going
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