XLEFF is the acronym of XML Layout Engine For Flash.

XLEFF web site

• What is XLEFF? - An article introducing the XML Layout Engine concept.
• XLEFF Sampler - A sample application that allows you to try XLEFF online.
• AdvancED ActionScript Components - This book, written by XLEFF’s creator, uses XLEFF as a case study to show how to expand the functionality provided by the Flash component architecture.