XML Binding Language

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...

XML Binding Language Wikipedia page
See also: (3 related languages)XML, CSS, SVG

Example from Wikipedia:

scrollbar {
  -moz-binding: url('somefile.xml#binding1');
}