[Paraview] XDMF file format for nested mesh

[Adrian LUCA]

Hello,

I have an unstructured triangular grid and inside each triangle element i have little triangles, so i'm talking about a nested mesh. To be more clear i've drew an element of my mesh:
                


               *

             /     \

           * ----   *

         /     \   /     \

      * ----   * ----   *

   /     \     /     \    /    \

* -----  * -----  * ----- *


As you can see, i have points besides the vertex of the element which are forming little triangles inside. 


I was able to write a ".xmf" file to view the big triangles only (i've isolated the three vertex of all the elements and i've used a standard triangle topology) but i don't have any idea of how i can add information about the little triangles inside. I'm new to XDMF and Paraview, so please if you can give me a small example of how this can be done that will be very good.

Thank you all in advance!

Best regards,

Adrian
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