Thank you for your reply.
I write TMX with width and height are both 40, and I only write two tile nodes in <data>, I open it with Tiled, it doesn't corrupt, and it shows correctly in my mac and win7, That's way I want that extra control.
I haven't test it in encoded tilemaps, If it corrupted in our engine, I will fix it.
This is my TMX file of <layer> node, you can test it in your computer.
 <layer name="Ground" width="40" height="40">
  <data>
   <tile gid="30"/>
   <tile gid="30"/>
  </data>
 </layer>