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XUL which is pronounced zool stands for <b>X</b>ML <b>U</b>ser Interface <b>L</b>anguage is a Mark-up language used primarily in Mozilla applications. It allows for XUL is used to define what the creation of feature rich visually appealing cross platform applications user interface will look like such as buttons and other widgets but it is not used to be easily created and maintained for online or offline usedefine how those item will look.
XUL is an [ XML] based language and thus has the a similiar set of advantages . One of the biggest being that it that its completly cross-platform . It accomplishes this by defining the locations and type of each widget but not defining what it will look like. Because of this the user-interface will use the systems native componets to build the GUI and thus looks like a native application. XUL also allows for the insertion of other XML languages into it such as [ XHTML], [ MathML] and [ SVG]. Also because of its structure all the GUI componets and tezt is localized structure which makes it can be easily translated easy translate into other languages.
XUL is often used for creating Mozilla extensions, such as [ ChatZilla]. Web applications can and do utilize XUL, but these are rare (typically proof-of-concept, such as the [ Mozilla Amazon Browser]). These XUL-based web applications can be confused for a native desktop application as they share many similar graphical widgets (text box, button, label, list box, check box, tree, menu, toolbar and more). Tip: If a web application is the goal, it is wise to use XUL with the XMLHttpRequest JavaScript object to make a responsive, "snappy" application that not only looks like a desktop application, but acts likes one speed-wise. Standalone XUL applications are more popular than web-based ones as the browser restricts operations (due to security concerns). When developers seek to add more functionality, a XUL application can be installed locally and will utilize [[Chrome]] so that it may be granted elevated privileges. Currently, an application named [[XULRunner]] is being developed that will to offer a runtime environment for XUL applications.
==Common Usages==
* Textboxes and inputsChrome* Toolbars and buttons* Navigation menus* Tabbed windowing systems* Keyboard Mnemonics and input handlingFirefox Extension's GUI
==Supported Technologies==
* GIF, JPG, PNG, BMP, ICO images
* HTTP 1.1
==Technical Details (Technologies XUL relies on)==
===eXtensible Bindings Language ([[XBL]])===
* Allows for additional, custom tags
* Can provide new event handlers and methods for existing elements
* Used to customize applications
* Gets around NPL & MPL licensing
* A means of calling upon the underyling C/C++ libraries for heavylifting
* Provides an install tool for distributing XUL applications
=Sample Code=
<?xml-stylesheet href="chrome://global/skin" type="text/css" ?>
<window xmlns=""
align="center" pack="center" flex="1">
<description>Is XUL cool or what?</description>
<button id="dpsbutton" label="DPS909 is fun" />
Paste the above sample code inside your favourite editor and save it with a file extension of .XUL. Open the file in a Mozilla-based browser to view it.
* Line 1: Declares that it is an XML file
* Line 2: Used to reference the stylesheets. In this case, the global/skin chrome directories' default global.css file is used. global.css is used to declare all of the XUL elements.
* Line 3: Describes a new window to be drawn, using the namespace All children of this window are XUL.
* Line 5: Description tag is like a label, but can wrap many lines.
* Lines 6-9: Describes a radio button group.
* Line 10: Draws a button.
=Example Applications=