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Factors Affecting The Production Of Web Based Applications

1469 words - 6 pages

The Document Object Model (DOM)The Document Object Model is a platform- and language-neutral interface that will allow programs and scripts to dynamically access and update the content, structure and style of documents. The document can be further processed and the results of that processing can be incorporated back into the presented page. The Document Object Model also contains a set of interfaces for an application that reads an XML (Extensible Markup Language) file into memory and stores it as a tree structure. The abstract API (Application Programming Interface) allows for constructing, accessing and manipulating the structure and content of XML and HTML documents.The DOM is extremely useful for random-access applications. SAX (another API used in XML) only allows you a view of one bit of the document at a time. If you are looking at one SAX element, you have no access to another. If you are looking at a text node, you have no access to a containing element. When you write a SAX application, you need to keep track of your program's position in the document somewhere in your own code. SAX does not do it for you. Also, if you need to look ahead in the XML document, you are just out of luck.Some applications are simply impossible in an event driven model with no access to a tree. Of course you could build some sort of tree yourself in SAX events, but the DOM allows you to avoid writing that code. The DOM is a standard tree representation for XML data.The Document Object Model Levels 0 & 1 are currently full W3C recommendations. The Document Object Model Level 2 is currently a Working Draft, and is subject to change. The DOM Level 2 is the section of the DOM that includes event handling, and other issues not addressed in Levels 1 & 0.The DOM Used in Major BrowsersMost of the current browsers (version 5 and up) support the DOM2 standard, or at least a good part of it. They may also continue to support some features of the earlier DOM levels, or their own proprietary extensions, so that they are compatible with older web pages. The good news is that, given the current industry trend, you can expect future versions of browsers to follow this standard. The bad news is that for now, you may find it difficult to code pages that work with both old and new browsers.One such example is Netscape 6.0, which drops support for many of the proprietary features of Netscape 4, such as the LAYER tag and its corresponding Layer object. They are not recognized in version 6, as they were never adopted as part of the standard.Also note that Internet Explorer's document.all construct is a proprietary feature, not part of any standard. While it may be supported in many versions of Internet Explorer - even the latest version - it's generally not supported by other browsers.DOM coding is also indirectly dependent on the standards for HTML and CSS (Cascaded Style Sheets), since the DOM reflects the tags and attributes defined by those standards. It also depends...

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