B3D file format animation chunks

Here's what it looks like to me:

Node
  {
  MESH{}
  ANIM
    {
    int flags
    int frames
    float fps
    KEYS
      {
      int flags
      int frame
      float position[3]
      float scale[3]
      float rotation[4]
      }
    KEYS {}
    KEYS {}
    KEYS {}...
    }
  }

But I have no idea where bones fit in, since the structure is just a vertex number and a weight.