The XML Résumé Library is, at its heart, a DTD, a Document Type Definition. That means it is really someone's idea of how a résumé should, or at least could, be structured in XML. Beyond that, it comes with
Several XSLT style sheets (used to convert the XML version of a résumé to other formats such as plaintext, HTML, PDF, and if you're lucky, RTF).
A Java-based filter to help you target your résumé(s) toward a particular industry, employer, or job.
CSS stylesheets, used to control the presentation of the HTML version.
A helpful Makefile that you can customize for your own purposes.