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About this same time, Netscape created a scripting language eventually called JavaScript. (It was called Mocha when prototyped and then LiveWire and LiveScript before being released as JavaScript.) JavaScript was designed as a way of making applets easier to develop for Web designers and programmers who weren t familiar with Java. (Of course, Microsoft had its own answer to JavaScript a scripting language called VBScript.) Netscape hired Brendan Eich to design and implement the new language, and he thought a dynamically typed scripting language was just what was needed. Though it has been much maligned for its lack of development tools, useful error messages, and debuggers, JavaScript is a powerful way to create dynamic Web applications. Originally, JavaScript was created to help developers dynamically modify the tags on their pages in an effort to provide a richer client experience. It became evident that one could treat the page as an object, and thus was born the Document Object Model (DOM). At first, JavaScript and the DOM were tightly intertwined, but eventually they evolved into separate

R.J. Townsend became a Drupal convert in late 2006 when searching for a CMS for a project and his brother-in-law commented, Hey, have you checked out Drupal He has spent the following years singing its praises to anyone who will listen. R.J. has since built more than 40 Drupal-powered web sites for clients in a number of industries, including retail, business-to-business, nonprofit, political advocacy, e-commerce, and higher education. With a passion for automating processes, research programs, and otherwise laborious tasks, Drupal has become his tool of choice. R.J. has experience working in both the technical and business sides of application development. He has worked in a number of roles, including designer, developer, project manager, trainer, and research analyst. He currently works almost exclusively with agencies and freelance designers, providing consulting, development, training, managed hosting, and technical support services. R.J. earned his master s degree in quantitative psychology from California State University Fullerton and is pursuing an MBA at the University of Delaware. He is a partner with Cultivate Technologies, a technology consulting firm specializing in open source software; Cultivate s primary service, CodeMyDesigns.com, targets Drupal development services to designers and agencies. He is also active in the Philadelphia chapter of the AIGA and is currently cochair of the interactive committee. On his off-time, R.J. loves to spend time with his family and son, visit authentic Mexican food restaurants, and play guitar. You can follow R.J. on Twitter at www.twitter.com/robertjtownsend.

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Furthermore, there can be no ambiguity as to how a service must be called If a system publishes its capabilities as a web-enabled service, it needs to clearly document how the service must be called SOA addresses many of the availability and scalability issues in today s applications Most applications implement a rigid synchronous communication model with a linear workflow that is highly susceptible to failures at any point SOA assumes that errors can and will occur, so it implements strategies for handling them For example, if a service fails to accept a message request the first time, the architecture is designed to retry the delivery And if the service is entirely unavailable (which should never occur in a robust SOA), the architecture is designed to avoid possible catastrophic failures that may disrupt the entire service request.

constructs. The DOM is a fully object-oriented representation of the page that can be modified with a scripting language such as JavaScript or VBScript. Eventually, the World Wide Web Consortium (W3C) got involved and standardized the DOM, while the European Computer Manufacturers Association (ECMA) ratified JavaScript as the ECMAScript specification. Any page and script written according to these standards should look and behave identically in any browser that adheres to these guidelines. A number of factors conspired against JavaScript in its early years. Browser support was spotty (even today the same script may behave differently across browsers), and clients are free to turn JavaScript off (some well-publicized security breaches have prompted many users to do so). The difficulty of developing JavaScript (can you say alert ) caused many developers to shy away from using the language often, while other developers simply ignored JavaScript, considering it a toy language for graphics designers. Most were content to create simple formbased applications after experiencing extreme mental fatigue while attempting to use, test, and debug complex JavaScript.

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