I've got feedback from Scott Prentice on recently released Tree Help plugin for FrameMaker. He has added the plugin to his leximation.com tools database. But it's not important. MIFML -- that is important. MIFML is an XML representation of a FrameMaker MIF file. Being the author of TeXML, an XML vocabulary for TeX, I'm sure that MIFML is a very good development.