Web services

Proposed standard by Microsoft, BEA and TIBCO for event notification.

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"This document demonstrates how the process of achieving meaningful interoperation between different environments can be achieved in a simpler and less error prone manner by applying some of the basic concepts described in WSDL 1.1."

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Before choosing SOAP for your extended enterprise's Web services, consider Representational State Transfer. Network World, 02/17/03.

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Weblog by Adam Bosworth, chief architect at BEA Systems and a key contributor to initial Web-services standards such as SOAP.

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"For developers wishing to bridge the gap between the Java and non-Java worlds, Apache Axis holds great promise. Axis is an open source Java framework for implementing Web services over XML-based SOAP (Simple Object Access Protocol). Yet, developers wishing to convert complex Java classes into SOAP-compliant types are likely to find their greatest challenges not with interoperability, but with Axis itself. This article guides the reader through the minefield of developing and deploying a sophisticated Web service using Axis. Coverage includes creating an Axis test client." JavaWorld, 04/11/03.

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"BPELSource is a complete resource guide for BPEL process management software, services, solutions, networks, information, forums, news, resources and guidance. We exist to help companies, users, developers, and vendors make well-informed decisions about BPEL."

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"Chris McGarel describes how he thinks the next generation of Web services applications can provide the same level of service as conventional distributed technologies in order to compete with those technologies." WebServices.org, 05/26/03.

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Web-services Weblog from a Web-services tool company.

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An introduction to implementing Web Services using CORBA servers. From CapeScience.

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"This introduction explains the basic concepts that underpin Web services, then shows how to create a simple Web service in under 10 minutes using Systinet WASP." From Systinet. In PDF.

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"In this article, we will compare and contrast three methods of consuming and producing web services: XML-RPC, SOAP and REST. This article assumes that the reader has a basic knowledge of both web service specifications and PHP. You must also have access to a PHP-enabled web server to implement our code samples." XML.com, 3/24/04.

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"What are the major forces driving ebXML Adoption? How do software vendors tackle the market? Will ebXML gain traction?" White paper from WebServices.org. Free registration required.

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"By following a set of cost-effective principles, custodians of large data repositories can enable web services by building web access to the data in a flexible manner that enables applications that haven't been built yet to have easy access to the data." By Phil Windley. In PDF.

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Clemens Vasters' Weblog: "Web Services work, do they?" Vasters is CTO at a .Net consulting firm.

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IBM/Microsoft white paper: "This document describes the issues around federated identity management and describes a comprehensive solution based on the Web services specifications outlined in the WS-Security roadmap and other related Web services specifications. The approach described in this whitepaper, which will be further defined in the WSFederation specification, introduces an identity provider as a class of security token service. As such, it uses the mechanisms of WS-Trust and WS-Federation to create and broker trust within and across federations. Additionally, mechanisms are defined for single sign-in and sign-out, sharing of attributes based on authorization and privacy policies, and integrated processing of pseudonyms (aliases used at different sites/federations).

"Together, the specifications identified in this paper provide a comprehensive and integrated set of protocols for secure reliable transacted messages in and across federations by composing with other security and Web service specifications."

In PDF.

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"This tutorial will teach you how to compose multiple services into a loan procurement flow, including how to invoke web services, receive asynchronous callbacks, manipulate XML documents and handle business exceptions." From Collaxa.

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Tutorials and links for learning how to develop XML and Web-services applications.

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Weblog: "Assembling on-demand web services to automate business, commerce, and the sharing of knowledge."

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"OASIS is a not-for-profit, global consortium that drives the development, convergence and adoption of e-business standards."

OASIS produces worldwide standards for security, Web services, XML conformance, business transactions, electronic publishing, topic maps and interoperability within and between marketplaces. OASIS operates XML.org, a community clearinghouse for XML application schemas, vocabularies and related documents and hosts The Cover Pages, an online reference collection for interoperable markup language standards. The OASIS Network includes UDDI, CGM Open, LegalXML and PKI.

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"Organizations have lots of data in legacy applications. This document sets forth a group of principles that will guide organizations as they make this legacy available on the net. Following these principles will enable web services that make use of that legacy data." By Phil Windley. In PDF.

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"The Pros and Cons of Web Services provides a complete definition of Web Services, and then discusses both the advantages and disadvantages of Web Services in a balanced manner. We balance each argument with a counterpoint, giving the other side of the story, and then we offer our opinion on the issue. While this report addresses these issues at a high level, it hopes to help the reader understand the critical issues facing the usage and adoption of Web Services in a business context." From ZapThink. In PDF

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A directory of available XML-based Web services.

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Weblog and essays on application development, in particular, Web services.

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Weblog: "To blog the news, articles, papers, reviews on standards, technologies and best practices in Semantic Web and Web Services."

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Tutorial aimed at developers. In PDF. eAI Journal, 12/01.

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"Discusses various approaches to solving the eight key challenges companies face when implementing a service-oriented architecture, and gives examples of EDS' own experience with clients." From Microsoft Architect Journal.

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Weblog on Web services in the enterprise.

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Research firm ZapThink presents 10 tips for using Web services to build service-oriented architectures.

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"This site will help you get started with Web services and service-oriented architectures. It features free articles, product listings, and services that can be used to develop a service-oriented architecture."

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Series of SOAP how-to's.

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"There has been a lot of discussion in the community concerning the relationship between Web and Grid Services. The Web Services Grid Application Framework (WS-GAF) is a proposal on how Grid applications could be built using today's Web Services specifications. The aim of the WS-GAF proposal is to start a debate on the possible future evolution of Grid Service standards."

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"This article introduces Web services technologies and how they work together to create a Web services architecture. The intent is to provide a straightforward, hype-free and vendor-neutral explanation of the technology." From CapeScience.

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"Unless the message exchanges of Web services are made reliable, organizations will not be able to trust them for deployment in industrial-strength business. In this paper, Prasad Yendluri, Principal Architect at webMethods, explains why there is a need for a reliable messaging solution that is independent of the underlying transport protocol used to transmit the messages, and gives an analysis of emerging Web services reliable messaging standards and the work done in this space previously by RosettaNet, BizTalk, and ebXML that forms the basis for the advancements in the Web services domain."

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Comparison of the two technologies (specifically, SOAP and CORBA's IIOP), by Irmen de Jong and others.

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"This article examines the current state of Web Services tools and technologies and explores the upcoming evolution from a simple set of technologies to a key enabler of Service-Oriented Architectures (SOAs). Service-Oriented Architectures break down monolithic applications into suites of services that are available across the enterprise. The article outlines a roadmap for the transformation from existing enterprise architectures into Service-Oriented Architectures. It also describes the major roadblocks that enterprises can expect to encounter along the journey. The article concludes with specific recommendations on how to ready your enterprise for the Services Revolution." From ThoughtWorks. In PDF.

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A Web services portal: News, forums and links.

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Web-services papers, calendar and Weblogs.

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"Emerging web services standards such as SOAP, WSDL and UDDI will enable system-to-system communication that is easier and cheaper than ever before. This site is a 'virtual laboratory' for developers, listing publicly available web services and showcasing new ways this technology can be applied."

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