15.1. Binding Concepts

XBL extends XML and the traditional Web environment the way C++ extends C. It provides object-like features on top of a system that has no object-like features to start with.

15.1.1. An Example Binding

Every XBL document is just a list of bindings, each stated with a <binding> tag. Constructing a binding is similar to constructing an object's class. Listing 15.2 shows a simple XBL binding that is a variant of the XUL <checkbox> tag's binding.

Listing 15.2. Example XBL binding similar to <checkbox>'s binding.
						<?xml version="1.0"?>
						<bindings
						xmlns="http://www.mozilla.org/xbl"
						xmlns:xbl="http://www.mozilla.org/xbl"
						xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
						>
						<binding id="checkbox" extends="general.xml#basetext"> ...

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