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Last modified: March 02, 2001
The Extensible Bindings Language (XBL)

[March 02, 2001]   W3C Publishes XML Binding Language (XBL) Specification.    The W3C has acknowledged receipt of a submission from America Online, Inc. (through mozilla.org) for XBL: XML Binding Language. According to the W3C NOTE, XBL is an XML markup language "for describing bindings that can be attached to elements in other documents. Bindings can be attached to elements using either cascading stylesheets (CSS) or the document object model (DOM). The element that the binding is attached to, called the bound element, acquires the new behavior specified by the binding. Bindings can contain event handlers that are registered on the bound element, an implementation of new methods and properties that become accessible from the bound element, and anonymous content that is inserted underneath the bound element." The XBL submission represents "a further development of two earlier submissions; it combines an XML-based wrapper format with CSS, ECMAScript and the DOM, to define the look and behavior of elements in HTML or XML-based documents (especially form elements). Apart from the XML-based wrapper format, it proposes an extension to CSS and new functions for the DOM." [Full context]

[February 26, 2000] "The current Mozilla infrastructure contains a number of recent feature additions, specifically intended to facilitate the design of user interface elements and the processing of events and operations on those elements. To date, this has been undertaken on a sort of "ad hoc" basis, with features being invented, augmented and redesigned only as needed. These features include anonymous content, the command dispatcher, the controller system, and the configurable key binding system. The above features have emerged as critical requirements for the Mozilla application. Unfortunately the design of these features has been haphazard at best. The design has also been particularly difficult because it necessarily involves non-standard extensions to CSS, the DOM, and HTML. The purpose of this document is to provide a concrete proposal for a redesign of the current system in order to enable the full range of functionality we need for the Mozilla application. In the following sections, I will tie together these different features into a new language, XBL, that can exist apart from XUL and that can be used with either XUL or HTML. The Structure of an XBL Document: An XBL file is a well-formed XML file. The root element of the file is a <bindings> tag. The namespace of XBL is http://www.mozilla.org/xbl. An XBL file consists of zero or more bindings, each declared as a child of the root element with a <binding> tag..."

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