Conversation logs saved by Empathy are in XML format. Each one links to a stylesheet "empathy-log.xsl":
<?xml-stylesheet type="text/xsl" href="empathy-log.xsl"?>
I've trawled my hard drive and the web but cannot find it (there is a empathy-log-manager.xsl but this is different). Does it even exist? If there is no such file I'll create my own but I'd rather use the one provided.