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Object-Oriented vs Flat Views of the DOM Interfaces
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The DOM specification takes a couple of different approaches toward specifying interfaces for manipulating XML/HTML documents: a traditional, hierarchical inheritance approach, and a simpler, flattened approach The inheritance approach works just like any good object-oriented programmer would expect: there exists a hierarchy of interface classes, with each subclass inheriting the interfaces of its superclass The flattened approach takes the view that all document manipulation can be accomplished using the Node interface without requiring the programmer to cast a node reference to another type of object According to the specification, this decision was made because casting objects from one type to another can be an expensive operation in some programming environments, such as Java and Microsoft s COM The DOM Working Group realized that the DOM API would be used in performance-critical environments
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The Document Object Model: Processing Structured Documents
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History of the DOM
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Before the DOM became an official W3C specification, the web community had started to develop ways of creating page-based script programs using languages like JavaScript that could be used among different web browsers This early work led to the development of what was called Dynamic HTML, which was primarily used for such things as richer user interfaces than plain HTML could provide on its own The origins of Dynamic HTML were in the web browsers, so its development was heavily influenced by the needs of web developers and the capabilities of the browsers themselves For example, there was no way of dealing with selections of text in a document because the browser was not an editor and didn t need to worry about such things When the DOM Working Group was formed at the W3C, application vendors from other domains, such as XML and HTML editors, joined this early group of developers in manipulating documents in different ways Several of these vendors already had experience with SGML (Standard Generalized Markup Language), an early forerunner of XML and HTML, and this experience helped influence the DOM s development Many of these vendors had developed their own proprietary interfaces for working with XML and HTML documents to serve their specific needs, such as document editing, and these interfaces have, in turn, also influenced the DOM s evolution
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The DOM on the Client
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The DOM got its start on the client side, becoming available around the time of Netscape 2 and Internet Explorer 3 Initially, these early implementations were
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where such operations could have a materially adverse impact on system performance Thus, the decision was made to allow a significant amount of the DOM s functionality to be used via the Node interface Still, the DOM Working Group considers the hierarchical view of the API to be the primary view of the DOM, with the added functionality of the Node interface as extra functionality that developers can use at their discretion The spec notes that this leads to some redundancy; for example, even though there is a generic property called nodeName on the Node interface, there is still a property called tagName on the Element interface Both of these properties must contain the same value; however, the Working Group considers supporting both as being worthwhile (politics are hard to escape, especially when you re trying to satisfy as many constituencies as the DOM Working Group is)
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1: Introduction to the DOM
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intended to allow web-scripting programmers to manipulate the contents of web pages, usually for things like animation or richer user interface construction Thus, these initial advancements in browser capabilities were referred to as Dynamic HTML, the ability to dynamically alter the appearance of HTML code in the browser As the browsers improved, so did their APIs for manipulating documents However, there was no clear standard for doing so, and the programming interfaces for the two main browsers began to diverge The W3C formed a working group to develop a standard way of working with structured documents, and it released its first recommendation in 1998 Microsoft and Netscape, the two main browser vendors, began working to bring their applications into conformance with the DOM specification; and with the release of Internet Explorer 6 and Netscape Navigator 6, the two companies have achieved complete support for DOM Level 1 Other browser vendors followed, such as Opera, a compact, multiplatform browser, and Konqueror, a popular web browser for the Linux platform
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