[Gmsh] Physical Groups in MSH

[Niels]

Hello.

I modeled a circular surface containing a circle. Now after the Meshing 
I want to get the coordinates only of the nodes belonging to the inner 
circle. I thought I could put the lines and points of the inner circle 
into a physical group and use this to identify the elements (line 
elements) that belong to the inner circle. But unfortunately in the MSH 
File all the tags for the physical group are "0". Could you please tell 
me how to save the physical group in the MSH File?

With kind regards

Niels
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