swfmill is an xml2swf and swf2xml processor with import functionalities.

It's most common use is the generation of asset libraries containing images (PNG and JPEG), 
fonts (TTF) or other SWF movies for use with MTASC- or haXe-compiled ActionScript, although 
swfmill can be used to produce both simple and complex SWF structures.

* built around an XSLT/EXSLT processor (libxslt)
* input and output of the XSLT transformation can be either XML or binary SWF
* XSLT commands for importing PNG, JPEG, TTF and SWF, and for mapping SWF ID numbers
* built-in "simple dialect" to support library creation and building simple SWFs