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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] John Cowan's XML 2003 presentations on XHTML 2 and RELAX NG
 My tutorials on RELAX NG and XHTML 2 are now available from: http://www.ccil.org/~cowan/relaxng.sxi http://www.ccil.org/~cowan/relaxng.ppt http://www.ccil.org/~cowan/relaxng.pdf http://www.ccil.org/~cowan/xhtml2.sxi http://www.ccil.org/~cowan/xhtml2.ppt http://www.ccil.org/~cowan/xhtml2.pdf These presentations are licensed under the GNU GPL, available at http://www.opensource.org/licenses/gpl-license.php and many other places. Here's the write-up from XML 2003. Title: RELAX NG: DTDs on Warp Drive Abstract: In this tutorial you will learn how to use the RELAX NG schema language, an alternative schema language for XML. RELAX NG allows easy and intuitive descriptions of just what is and what is not allowed in an XML document. It is simple enough to learn in a few hours, and rich and flexible enough to support the design and validation of every kind of document from the very simple to the very complex. Once RELAX NG's concepts have crossed the blood-brain barrier, you will never be able to take any other schema language quite seriously again. RELAX NG is an evolution and generalization of XML DTDs, and it shares the same basic paradigm. Based on experience with SGML and XML, RELAX NG both adds and subtracts features from DTDs. XML DTDs can be automatically converted into RELAX NG. Experts in designing SGML and XML DTDs will find their skills transfer easily to designing RELAX NG. Design patterns that are used in XML DTDs can be used in RELAX NG. Overall, RELAX NG is much more mature (and it is possible to have a higher degree of confidence in its design) than it would be if it were based on a completely new and different paradigm. A major goal of RELAX NG is that it be easy to learn and easy to use. Schemas can be patterned after the structure of the documents they describe, but need not be: definitions to be composed from other definitions in a variety of ways. Attributes and elements are treated uniformly as much as possible. RELAX NG supports pluggable simple datatype libraries, from a trivial one that describes only strings and tokens to the full XML Schema Part 2; new ones can be readily designed and built as needed. RELAX NG provides full support for namespaces. RELAX NG provides two interconvertible syntaxes, an XML one for processing, and a compact non-XML one for human authoring. RELAX NG has been standardized in OASIS by the RELAX NG Technical Committee, and is Part 2 of ISO DSDL, the Document Schema Definition Languages umbrella. As a bonus, attendees will learn something about XLink and something about XML Schema Part 2: Datatypes. Prerequisites: Understanding of XML; basic understanding of XML DTDs. Knowledge of XML Schema or SGML DTDs is helpful, but not required. Title: Moving Toward XHTML 2.0 Abstract: XHTML 2.0 is an evolving standard being worked on by the HTML Working Group of the W3C. It is the first major change to the semantics of HTML since HTML 4.0. Obsolete syntax has been discarded, the separation of content and presentation is essentially complete, and genuinely new features are being introduced. XHTML 2.0 is intended to be more usable, more accessible to different kinds of users and display devices, easier to write by hand or with tools, and less reliant on embedded scripting languages for commonly used functionality. While it is impossible to predict at this point the degree of market uptake that XHTML 2.0 will have, it is prudent to plan ahead for several reasons. Although support of legacy HTML will probably be provided forever for practical reasons (there is just too much Web out there to convert it all), it is already possible to avoid most deprecated and obsolete features in favor of version-neutral equivalents using HTML and CSS facilities. In addition, the ability to generate both old and new HTML from the same XML foundation using XSLT will allow early adopters of XHTML 2.0 to offer an enhanced user experience to early adopters of fully XHTML 2.0-aware browsers. (The existence of cross-platform open-source browsers, plus the presence of major browser companies on the WG, pretty well ensures that at least some such browsers will in fact come into existence.) The not-yet-complete XHTML 2.0 draft comprises almost 200 pages of material. By taking this tutorial, you will have the major new and deprecated features presented to you in easily digestible form. Although this is not a tutorial on XForms or XEvents, since XHTML 2.0 uses these existing W3C specifications, a basic introduction to them will be provided. Lastly, because of its fully modular definition, it will be easy to provide subsets of XHTML 2.0 for use within other document types to provide rich textual annotations or embedded presentation-ready material. This tutorial will clearly indicate the module boundaries and suggest possible modules and sets of modules for adoption into other document types. Prerequisites: Understanding of XML, HTML 4.0. Understanding of XHTML 1.0, 1.1, and XHTML Modularization useful but not required. -- Where the wombat has walked, John Cowan <jcowan@r...> it will inevitably walk again. http://www.ccil.org/~cowan 
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