1, Introducing Web Services in .NET framework

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1, Introducing Web Services
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This chapter highlights the most important aspects of Web services and what they can be used for, as well as contains a detailed overview of the entire book Information is provided about the following:
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XML (Extensible Markup Language), the family of related specifications on which all Web services technologies are built WSDL (Web Services Description Language), providing the fundamental and most important abstraction of Web services, the interface exposed to other Web services and through which Web services are mapped to underlying programs and software systems SOAP (Simple Object Access Protocol), providing communications capability for Web services interfaces to talk to one another over the Internet and other networks UDDI (universal description, discovery, and integration), providing registry and repository services for storing and retrieving Web services interfaces ebXML (electronic business XML), an architecture and set of specifications designed to automate business process interaction among trading partners Additional technologies, going beyond the core Web services standards to meet requirements for security, reliable messaging, transaction processing, and business process flow so that more complex and critical business applications can use them Vendor implementations, providing a variety of implementations usually aligned with existing products but in some cases entirely new products for flexible and extensible Web services
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2, Describing Information: XML
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The Extensible Markup Language (XML), like the Hypertext Markup Language, shares a common ancestry in the Standard Generalized Markup Language (SGML) One of the characteristics of SGML was the separation of format and content Whether a document was produced for A4 or in letter format, for example, the format was described independently of the content of the document The same document could therefore be output in multiple formats without changing the content This principle of markup languages is applied to Web services through the separation of the document instance, which contains the data, and the schema, which describes the data structures and types, including semantic information useful for mapping the document to multiple programming languages and software systems XML represents a large number of specifications, many of which are more pertinent to document processing than to information processing This chapter describes the XML specifications and technologies most important to Web services, which in general can be said to go "beyond markup" to provide facilities for structuring and serializing data This chapter includes only those XML technologies relevant to Web services and explains how and what they are
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3, Describing Web Services: WSDL
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The Web Services Description Language (WSDL) provides the mechanism through which Web services definitions are exposed to the world and to which Web services implementers need to conform when sending SOAP messages WSDL describes the data types and structures for the
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Understanding Web Services- XML, WSDL, SOAP and UDDI
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Web services, explains how to map the data types and structures into the messages that are exchanged, and includes information that ties the messages to underlying implementations WSDL is defined so that its parts can be developed separately and combined to create a comprehensive WSDL file The data types and structures can be shared among multiple messages, as can the definition of the services exposed within the interface WSDL lists the interfaces and, within an interface, associates each service with an underlying implementation In order to achieve communication for Web services, WSDL maps them onto communication protocols and transports Both parties in a Web services interaction share a common WSDL file The sender uses the WSDL file to generate the message in the appropriate format and to use the appropriate communication protocol The receiver uses the WSDL file to understand how to receive and parse the message and how to map it onto the underlying object or program
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4, Accessing Web Services: SOAP
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Once an interface is defined for them, Web services need a way to communicate with one another and to exchange messages The Simple Object Access Protocol (SOAP) defines a common format for XML messages over HTTP and other transports SOAP is designed to be a simple mechanism that can be extended to encompass additional features, functionalities, and technologies This chapter describes the parts of SOAP and the purpose of each SOAP is a one-way asynchronous messaging technology that can be adapted and used in a variety of message-passing interaction styles: remote procedure call (RPC) oriented, document oriented, and publish and subscribe, among others If anything defines the minimum criterion for a Web service, it must be adherence to SOAP SOAP messaging capability is fundamental to Web services SOAP is defined at a very high level of abstraction and can be mapped to any number of underlying software systems, including application servers, NET servers, middleware systems, database management systems, and packaged applications The chapter describes the required and optional parts of SOAP, explains how SOAP messages are processed, and discusses the role of intermediaries in SOAP message processing Background information on the specification is provided, as are examples of the major SOAP parts An explanation of SOAP with Attachments is also included
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