XML Binding Language, aka XML Binding Language, is a xml format created in 2000.
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XBL (XML Binding Language) is an XML-based markup language used to declare the behavior and look of XUL-widgets and XML elements. Development of the XBL specification was abandoned by the W3C in 2012. XBL was developed by the Mozilla project for use in the Mozilla Application Suite; the language is not currently described by any formal standard and is thus proprietary to Mozilla, with the only implementation being the Gecko layout engine. Read more on Wikipedia...
scrollbar {
-moz-binding: url('somefile.xml#binding1');
}