XUL Template Primer

This document is a brief tech note intended to introduce XUL templates to someone new to the subject. It describes the extended XUL template syntax using a simple example. XUL templates are a way of embedding "live data" into a XUL document. A XUL template is a collection of rules that is used to build XUL and HTML content from one or more RDF datasources. A template specifies a "cookie cutter" content model pattern, along with the conditions indicate when the pattern should apply.

http://www.mozilla.org/docs/xul/xulnotes/template-primer.html