Add a diagram of execution flow in the first post.
<img src="http://i1081.photobucket.com/albums/j352/rexrainbow1/TMXImporter_1tick_zps9aa9161c.png" border="0" />
<img src="http://i1081.photobucket.com/albums/j352/rexrainbow1/TMXImporter_duration_zps87492b00.png" border="0" />
Hope it could help users.