[Gmsh] Meshing Inside Merges Surfaces

[sdfsdf sdfsdfsf]

Hi,
I have 3 polygons which are arranged in a triangular shape (i.e. they are in a loop) inside a rectangular container. Each of the polygons shares a common line with the 2 others. I want to mesh everything inside the container apart from what's inside the polygons themselves. So far, I can get gmsh to do this but it does not mesh the inside part of the 3 polygon-loop. Is there any way to get gmsh to do this without defining the inner part as a surface? E.g. something like layers?
Thanks,Adam 		 	   		  
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