Animation in MDL files

Hi, What I am doing is to import the mdx file into XNA platform. Static model renders correctly. And the dynamic animation is incorrect. Don't worry, I am not asking a question about XNA, but it related with the MDL file format.
As I know, Animation is controlled by Rotation, Scaling, and Translation, yes, it works. And The key problem is that how does it work together with geoset.
Each bone has a parameter GeoseID to tell which it is related, but there are many bones related with a Geoset. It looks one bone control parts of geoset.
Now, the problem is how each bone control parts of geoset.

are you converting directly from .xna to .mdl or through an intermediary, like max.

The pipeline is MDX or MDL into XNA content pipeline directly, no intermediate.

the problem is

how does the bone controlls the vertex.

I have guessed some information about this, but there are something I don't understand,

Another post here, http://www.wc3c.net/showthread.php?t=110513

yeah, i don't have a clue as i've never done that before. my only suggestion is to drop it in max or blender or something in order to make sure it converted right.

Thanks for your reply. Here is an answer: http://www.wc3c.net/showthread.php?t=110514