114 CHAPTER 4 CLIENT-SIDE (Bulletproof web design) XML XUL XUL
114 CHAPTER 4 CLIENT-SIDE XML XUL XUL (pronounced zool and rhymes with cool) is a proprietary language created by Mozilla that describes Mozilla user interfaces. You can use XUL to create interfaces containing elements such as form controls, toolbars, and menus. The advantage is that it provides a simple way to define user interface widgets. You might use XUL to add functionality to Mozilla or to create complete applications such as Firefox and Thunderbird. XUL is beyond the scope of this book, but you can find a great introduction to it at http://developer.mozilla.org/en/docs/XUL_Tutorial. XBL XBL works with XUL to describe the behavior of XUL widgets. Again, Mozilla developed XBL and submitted it as a note to the W3C. It provides similar functionality to IE XML data binding, combined with IE DHTML behaviors. You can find out more about XBL at http:// developer.mozilla.org/en/docs/XUL_Tutorial:Introduction_to_XBL. Native SVG Support Chapter 3 introduced you to SVG. The latest version of Firefox, 1.5, includes native SVG for most of the SVG 1.1 recommendation. It doesn t include support for filters, SVG-defined fonts, and declarative animations. Netscape 8 doesn t offer SVG support. Opera Opera has supported XML since version 4, but it doesn t yet have the same level of support offered by the other major browsers. At the time of writing, the next release, 9.0, plans to increase XML support. Examining the Expat Parser Like Mozilla, Opera also makes use of the Expat open source parser. W3C DOM Support Opera 8 has full support of XML DOM 2. XSLT Opera 8.5 has no support for XSLT stylesheets, though it s planned for the forthcoming release of Opera 9. You must apply XSLT stylesheet transformations on the server side if you re targeting Opera. Viewing Raw XML in Opera Opera ignores the XML tags within a document and displays only the content from the elements, in accordance with the recommendation. Figure 4-9 shows how the XML document dvd.xml, displays in Opera. Opera treats all elements as inline and renders all text in the same font.
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