# Asking about Dolfin convert Facet region dan Physical region **URL:** \ **Category:** mesh\ **Created:** [March 28, 2021, 3:47pm UTC](https://fenicsproject.discourse.group/t/asking-about-dolfin-convert-facet-region-dan-physical-region/5442 "2021-03-28T15:47:10Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Audi\_Rachman](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/audi_rachman/32/2329_2.png) [@Audi\_Rachman](https://fenicsproject.discourse.group/u/Audi_Rachman)\ **Post date:** [March 28, 2021, 3:47pm UTC](https://fenicsproject.discourse.group/t/asking-about-dolfin-convert-facet-region-dan-physical-region/5442/1 "2021-03-28T15:47:10Z")
Hello I’m trying to make a model that uses the dolfin program. and I have a domain/mesh file that has a .14 format and I manually convert it to xml format using a program that I make so the program can read my domain file. But it turns out when you convert a file using dolfin convert it is converted into 3 files: The domain file, facet region file, and physical region file. Can somebody tell me the logic behind facet region file and physical region file so maybe i can manually make the file with a program? Here i attached an example of facet region and physical region file. I would be very grateful if I got the answer to my question. Thank you for the attention. ---
**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\ **Post date:** [March 28, 2021, 8:50pm UTC](https://fenicsproject.discourse.group/t/asking-about-dolfin-convert-facet-region-dan-physical-region/5442/2 "2021-03-28T20:50:20Z")
It is not adviced to use dolfin-convert and xml any longer, i would suggest using meshio. See for instance: [Extracting mesh regions for gmsh mesh - #16 by dokken](https://fenicsproject.discourse.group/t/extracting-mesh-regions-for-gmsh-mesh/1125/16)