# Transitioning from mesh.xml to mesh.xdmf, from dolfin-convert to meshio

**URL:** https://fenicsproject.discourse.group/t/transitioning-from-mesh-xml-to-mesh-xdmf-from-dolfin-convert-to-meshio/412
**Category:** mesh
**Created:** [March 22, 2019, 9:01am UTC](https://fenicsproject.discourse.group/t/transitioning-from-mesh-xml-to-mesh-xdmf-from-dolfin-convert-to-meshio/412 "2019-03-22T09:01:33Z")
**Posts on this page:** 1
**Showing post:** 79

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### 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: [February 18, 2020, 10:27pm UTC](https://fenicsproject.discourse.group/t/transitioning-from-mesh-xml-to-mesh-xdmf-from-dolfin-convert-to-meshio/412/79 "2020-02-18T22:27:29Z")

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@fforteneto, After some help from @nschloe, the following code will work with the newest meshio:

```auto
import meshio
msh = meshio.read("mesh.msh")
for cell in msh.cells:
    if cell.type == "triangle":
        triangle_cells = cell.data
    elif cell.type == "tetra":
        tetra_cells = cell.data

for key in msh.cell_data_dict["gmsh:physical"].keys():
    if key == "triangle":
        triangle_data = msh.cell_data_dict["gmsh:physical"][key]
    elif key == "tetra":
        tetra_data = msh.cell_data_dict["gmsh:physical"][key]
tetra_mesh = meshio.Mesh(points=msh.points, cells={"tetra": tetra_cells})
triangle_mesh =meshio.Mesh(points=msh.points,
                           cells=[("triangle", triangle_cells)],
                           cell_data={"name_to_read":[triangle_data]})
meshio.write("mesh.xdmf", tetra_mesh)

meshio.write("mf.xdmf", triangle_mesh)

```

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