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Separation of Presentation and Content
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The separation of content from presentation is perhaps the single most important concept in web development today. This fundamental principle underpins most modern web specifications. Content refers to the basic data and structures that make up a document. Within XHTML, this includes elements such as headings, paragraphs, tables, and lists. Presentation determines how these structures appear within the viewing device and might include font faces, colors, borders, and other visual information. Cascading Style Sheets (CSS) control the presentation of a document.
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Note When working with XML applications, you can separate the content into both data and data structures. In XML applications, an XML document supplies the data, while XSLT stylesheets provide the structure. You still apply styling through CSS stylesheets.
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It s important to separate content from presentation because it allows you to repackage the content for different audiences. If you want to provide the same information to a web browser, a mobile phone, and a screen reader, the presentation layer must be different for each device. You can achieve this by excluding the presentation of information from web documents. Separating presentation from content has four major benefits: Accessibility Targeted presentation using stylesheets Streamlined maintenance Improved processing Let s look at each of these benefits in more detail.
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Accessibility
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In recent times, the W3C has focused on making XHTML more accessible to people with disabilities. For example, people with visual impairments can use screen readers and voice browsers when working with XHTML documents. Documents that follow the XHTML construction rules often require little or no change, so users can access them with a screen reader. Many countries have legislation requiring web sites to be accessible to people with disabilities. In the United States, Section 508 of the Rehabilitation Act of 1973 requires people
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CHAPTER 3 WEB VOCABULARIES
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with disabilities to have access to federal agency electronic information. You can find out more about this regulation at http://www.usability.gov/accessibility/. The W3C Web Accessibility Initiative web site (http://www.w3.org/WAI/) provides information about how to make web sites accessible. The site includes quick tips for accessibility (http://www.w3.org/WAI/References/QuickTips/), as well as a list of tools to help you evaluate whether your site is currently accessible (http://www.w3.org/WAI/ER/existingtools.html). By separating the visual elements from the actual content of your page, you make the content instantly more accessible. Screen readers and other text-based browsers, such as Lynx for Unix and Linux, can interpret the flow of the document easily. Ultimately, users of your site will have a better experience.
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Targeted Presentation
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If you separate the presentation layer from your content, you ll be able to target its appearance for specific devices. You can do this by storing all style information within a stylesheet and linking a specific stylesheet for each device that you want to support. Storing the style information in one place makes it easier to reuse stylesheets and maintain a consistent look. Several types of stylesheets exist, but the most popular are CSS and XSLT. I ll explain these stylesheets in detail in s 5 to 7.
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Streamlined Site Maintenance
Storing the content and structure separately from the presentation layer makes it easier to maintain your web site. Pages no longer contain presentational elements mixed in with the XHTML structures and data. When working through long blocks of code, you only need to concern yourself with the structural elements because the presentation layer exists elsewhere. This streamlines the site maintenance process and speeds up workflow.
Improved Processing
Accessibility and targeted presentation were important concerns in HTML even before XHTML was introduced. XHTML, however, directly addresses the need for an improved processing model. Because the rules for XML are so strict, processing XHTML documents becomes easier than processing its predecessor HTML. Software programs can perform XML-related tasks, such as designing XSLT stylesheets. See the WYSIWYG XSLT Designer by Stylus Studio (http://www.stylusstudio.com/xhtml.html) for one such example. Because the rules for constructing HTML were less strict than XHTML rules, it was possible for HTML pages to contain mistakes that didn t affect their display. For example, you could leave out a closing </body> tag but still be able to view the page within a browser. In addition, some web browsers rendered elements slightly differently, so browser manufacturers started adding proprietary extensions to their browsers. Ultimately, this led to incompatible browsers and lack of compliance with the HTML specification. You can instruct more recent browser versions and software tools to discard XHTML documents that aren t authored correctly and don t use valid, well-formed XHTML. Modern browsers feature improved page processing because they don t need to deal with malformed documents.
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