Appendix K Introduction to XHTML: Part 1 1451
Appendix K Introduction to XHTML: Part 1 1451 ment is valid. There are other XHTML document types as well. This particular example uses the XHTML transitional document type. This document type exists to enable XHTML document creators to use legacy HTML technologies in an XHTML document. In this example, the type attribute of the ol element (lines 33 and 47) is a legacy HTML technology. Changing lines 2 3 as shown in this example, enables us to demonstrate ordered lists with different numbering formats. Normally, such formatting is specified with style sheets. Most examples in this book adhere to strict HTML form. Testing and Debugging Tip K.2 Most current browsers still attempt to render XHTML documents, even if they are invalid. K.11 Internet and World Wide Web Resources www.w3.org/TR/xhtml1 The XHTML 1.0 Recommendation contains XHTML 1.0 general information, compatibility issues, document type definition information, definitions, terminology and much more. www.xhtml.org XHTML.org provides XHTML development news and links to other XHTML resources, which include books and articles. www.w3schools.com/xhtml/default.asp The XHTML School provides XHTML quizzes and references. This page also contains links to XHT- ML syntax, validation and document type definitions. validator.w3.org This is the W3C XHTML validation service site. hotwired.lycos.com/webmonkey/00/50/index2a.html This site provides an article about XHTML. Key sections of the article overview XHTML and discuss tags, attributes and anchors. wdvl.com/Authoring/Languages/XML/XHTML The Web Developers Virtual Library provides an introduction to XHTML. This site also contains articles, examples and links to other technologies. www.w3.org/TR/1999/xhtml-modularization-19990406/DTD/doc The XHTML 1.0 DTD documentation site provides links to DTD documentation for the strict, transitional and frameset document type definitions. SUMMARY XHTML (Extensible Hypertext Markup Language) is a markup language for creating Web pages. A key issue when using XHTML is the separation of the presentation of a document (i.e., the document s appearance when rendered by a browser) from the structure of the information in the document. In XHTML, text is marked up with elements, delimited by tags that are names contained in pairs of angle brackets. Some elements may contain additional markup called attributes, which provide additional information about the element. A machine that runs specialized piece of software called a Web server stores XHTML documents. XHTML documents that are syntactically correct are guaranteed to render properly. XHTML documents that contain syntax errors may not display properly.
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