Understanding Web Services Xml Wsdl Soap And Uddi Pdf
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- Understanding Web Services- XML, WSDL, SOAP and UDDI
- Understanding Web Services- XML, WSDL, SOAP and UDDI [1ed.]9780201750812, 0201750813
- Understanding Web Services: XML, WSDL, SOAP, and UDDI
- What are Web Services? Architecture, Types, Example
If you want to study these subjects first, please read our XML Tutorial. When all major platforms could access the Web using Web browsers, different platforms couldn't interact.
A WSDL service description contains an abstract definition for a set of operations and messages, a concrete protocol binding for these operations and messages, and a network endpoint specification for the binding. The UDDI data entities provide support for defining both business and service information. UDDI provides support for many different types of service descriptions. The purpose of this article is to augment that information.
Understanding Web Services- XML, WSDL, SOAP and UDDI
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The company was asking for proposals to help it develop an enterprise integration architecture based on the hub and spoke model, using XML as the canonical message format that would tie together the company's thousands of systems and hundreds of programming languages. My employer at the time, Compaq Digital , did not win the project, but the controversial idea of using XML in a data-independent integration layer stuck with me. Now Web services are fulfilling that promise for everyone.
In early , I got involved in the new effort Microsoft was leading to define a distributed computing protocol for the Internet: SOAP. One thing led to another, and I eventually took on the responsibility of delivering IONA's implementation of Web services integration technologies. It was then that I realized the potential for Web services technologies for application integration inside the firewall. Then you could use the same approach for integration, regardless of whether it's inside the company or across the Internet.
David was author of the Microsoft chapter in that same book. In the Digital chapter, "The Key to the Highway," Peter Conklin and I compared the potential power of software standards to the impact of standards on the automobile. Standardized parts enabled mass production, which revolutionized the industry and society.
Today, software remains essentially a craft business, as automobiles were at the start of the twentieth century. Having widely adopted standards has remained elusive despite many attempts. We may be at the crossroads; Web services may finally do the trick. I hope this book helps you understand what Web services are all about.
If it serves as a decent introduction to the main ideas, concepts, and technologies, it will have done its job and find its place in the Web services community. David helped shape the organization, content, and overall approach of the book, which I greatly appreciated. NET information in this book is drawn primarily from David's book, which he was kind enough to share with me in advance of publication. Second, I'd like to thank Steve Vinoski, who provided the most thorough and helpful review of the entire manuscript, commenting with equal emphasis on small details and big ideas.
Qun Joanna Liang was tremendously helpful in providing and correcting examples in Chapter 2. Ben Bernhard and Daniel Kulp helped with examples for Chapters 3 and 4.
Pyounguk Cho provided a helpful, last-minute review of Chapter 5. Although they provided the original information and reviewed the text, any remaining errors are solely my responsibility. Many thanks to the Addison-Wesley editorial and production staff, who made the preparation and finishing of the manuscript a truly professional, high-quality endeavor: Mary O'Brien, Alicia Carey, Marilyn Rash, Jacquelyn Doucette, and Evelyn Pyle. Finally, I would really, really like to thank my wife, Jane, and kids, Erica and Alex—yes, really— for bearing with me and for understanding the time away.
Introduction Web services are changing the way we think about distributed software systems, but there's a limit to what they can do. This book describes the concepts behind the basic Web services technologies, and it also includes chapters on ebXML, additional Web services technologies, and product implementations.
The book is intended for IT professionals who are interested in understanding Web services, how they work, and what they are good for. NET servers, messaging, and packaged applications. Web services work at a level of abstraction similar to the Internet and are capable of bridging any operating system, hardware platform, or programming language, just as the Web is.
The default network protocol is HTTP. Most existing distributed computing technologies include the communications protocol as part of their scope. With Web services, the communications protocol is already there, in the far-flung, worldwide Web. New applications become possible when everything is Web service enabled.
Once the world becomes Web service enabled, all kinds of new business paradigms, discussion groups, interactive forums, and publishing models will emerge to take advantage of this new capability.
Software and hardware vendors alike are rushing Web services products to market. The widespread adoption of the core standards represents a significant breakthrough in the industry. Applications can truly be built using a combination of components from multiple suppliers.
Specialists are emerging to provide services in the areas of security, transaction coordination, bill processing, language translation, document transformation, registries and repositories, accounting, reporting, and specialized calculation. Applications being built anywhere, anytime, on any system can take advantage of prebuilt components, speeding time to market and reducing cost. Meanwhile, ebXML, which chartered and maintains a separate course, continues to solve tough problems for corporate trading partners that are establishing automated supply chain purchasing and invoicing systems, large electronic document transfers, and business communities sharing common goals.
The rightful heir to EDI, ebXML is providing an easier-to-use, lower-cost alternative to businesses automating their interactions with other businesses. With ebXML, a company's internal IT systems are connected to the IT systems of its trading partners, subcontractors, and business collaborators. The value inherent in these systems is therefore greatly increased, as they become essentially part of one large IT system, with essential information flowing freely across corporate boundaries rather than stuck within them.
Considerable overlap exists between the core Web services technologies and ebXML. Convergence between the two is based on their common adoption of SOAP as the transport and on the ability of the respective registries to share data. The ebXML specifications include many qualities-of-service requirements that are not yet included in Web services, such as message integrity and nonrepudiation, reliable messaging, business process flow, and protocol negotiation.
Further convergence is possible as the core Web services technologies begin to adopt proposals in these additional technology areas. Disagreement remains over the best approach to defining these additional technologies in the context of Web services.
Once the core standards are adopted widely, the discussion moves up the stack to tackle quality-of-service issues. Security, transactions, process flow, and reliable messaging standards are needed, and some are further along than others. XML finally solves the problem of data independence for programming languages, middleware systems, and database management systems.
Previously, data types and structures were specific to these types of software, and attempts at common definitions, such as CORBA IDL, gained limited acceptance. The Web services technologies described in this book are all created using applications of XML in one way or another. XML is not one thing but rather a variety of technologies in itself, covering instance data as well as typing, structure, and semantic information associated with data.
XML not only describes data independently but also contains useful information for mapping the data into and out of any software system or programming language. Web services provide almost unlimited potential. Any program can be mapped to Web services, and Web services can be mapped to any program. When all programs and software systems are finally Web service enabled, the world of distributed computing will be very different from what it is today.
About This Book To provide a background and sufficient detail for practical understanding and use of these technologies, this book is organized into chapters on the main topics of interest.
Chapter 1, Introducing Web Services 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. 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.
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. 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. 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. 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. Background information on the specification is provided, as are examples of the major SOAP parts. The UDDI registry can be searched using various categorization criteria to obtain contact information for businesses offering services of interest.
UDDI provides a publicly accessible means to store and retrieve information about Web services interfaces and implementations. This chapter also provides background on the UDDI organization that sponsors the physical registry and the process by which UDDI specifications and technologies are moving toward adoption.
The Web needs something like UDDI to provide a clearinghouse for Web services information so that publishers and consumers can find each other. Only then can the true value of Web services be realized: when Web services consumers can easily and quickly locate and begin accessing Web services implementations anywhere in the world. For the first several months, ebXML was an entirely separate and parallel effort.
Many of the goals of ebXML are common to Web services, and many of the technologies overlap in concept. In general, however, ebXML is focused more at the industrial or enterprise computing level, addressing as the top goal the issue of business process definition. Individual specifications are described and placed into their proper context within the overall architecture.
The ebXML architecture includes many of the same things as the core Web services technologies but goes beyond them in defining quality-of-service requirements for reliable messaging, security, and trading-partner negotiation.
Chapter 7, Web Services Architecture: Additional Technologies After the core Web services technologies are implemented and adopted, a whole range of additional technologies is needed to enable Web services to address complex and critical application requirements. Businesses will need to secure their Web services against unauthorized use, to guarantee that their SOAP messages arrive at their intended destinations and are processed reliably, and to define and execute automated business process flows according to a standard mechanism.
This chapter describes these and other technologies in the context of the vendor and industry initiatives in which they are likely to progress toward adoption. In some cases, competing proposals vie for adoption, and the leading candidates are discussed. Chapter 8, Implementing Web Services Web services specifications and technologies are not meaningful or particularly useful without implementations in software vendor products.
This chapter summarizes the major architectural approaches to Web services implementation, describes the major development communities of. Some vendors tend to view Web services implementations primarily within the context of their existing products, as additional clients or adapters into and out of the existing application servers, database management systems, and middleware systems.
Other vendors seek to mine the value of the Web services layer itself, where multiple, disparate software system domains are put into relationship and integrated.
Understanding Web Services- XML, WSDL, SOAP and UDDI [1ed.]9780201750812, 0201750813
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Understanding Web Services: XML, WSDL, SOAP, and UDDI
Web services enable the new generation of Internet-based applications. These services support application-to-application Internet communication--that is, applications at different network locations can be integrated to function as if they were part of a single, large software system. Examples of applications made possible by Web services include automated business transactions and direct nonbrowser desktop and handheld device access to reservations, stock trading, and order-tracking systems. This book introduces the main ideas and concepts behind core and extended Web services' technologies and provides developers with a primer for each of the major technologies that have emerged in this space.
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What are Web Services? Architecture, Types, Example
The acronym is also used for any specific WSDL description of a web service also referred to as a WSDL file , which provides a machine-readable description of how the service can be called, what parameters it expects, and what data structures it returns. Therefore, its purpose is roughly similar to that of a type signature in a programming language. The meaning of the acronym has changed from version 1. The WSDL describes services as collections of network endpoints, or ports.
It also describes how to use the WSDL Generator component, which provides integration technologies to access the functionality of Content Server. Section For general information about web services that you can use with Content Server, see Section SOAP is a lightweight, XML-based messaging protocol for encoding the information in web service request and response messages before sending them over a network. With IDCService, you can do any of these tasks:.
Haynes ManualsThe Haynes Author : Eric Newcomer Description:Web services enable the new generation of Internet-based applications. These services support application-to-application Internet communication-that is, applications at different network locations can be integrated to function as if they were part of a single, large software system. Examples of applications made possible by Web services include automated business transactions and direct nonbrowser desktop and handheld device access to reservations, stock trading, and order-tracking systems. This book introduces the main ideas and concepts behind core and extended Web services' technologies and provides developers with a primer for each of the major technologies that have emerged in this space. In addition, Understanding Web Services summarizes the major architectural approaches to Web services, examines the role of Web services within the. Categories: Computers Networking: Internet.
Understanding Web. Services. XML, WSDL, SOAP, and UDDI. Eric Newcomer. A Addison-Wesley. Boston. San Francisco " New York a Toronto. Montreal.