[Gmsh] about .mesh file format

[Geordie McBain]

2010/7/17 Felipe Montefuscolo <felipe.mt87 at gmail.com>:
> Dear Gmsh developer,
> When I export a mesh to *.mesh file format, I choose the option "element
> tag->Physical entity" (and uncheck the "Save All") to use the labels of the
> elements as a boundary conditions in my FEM code. My question is if one can
> change the
> label that appear in the list of vertices (zero in Gmshv2.42 and Elementary
> entity in Gmshv.nightly) to Physical entity, as
> is already the case to the list of Edges and Triangles when I choose the
> option "element tag->Physical entity".

At http://www.geuz.org/pipermail/gmsh/2010/005446.html I read

  `We could not save physical tags, as you can have more than one per entity.'

but I wonder whether in such cases just putting one, any one, might be
satisfactory?  (Though I don't have a use for node tags myself.)