Version 2

Version "2" of Xdmf is being deprecated but it can be found in the history at:

git clone git://xdmf.org/Xdmf.git

There were two important branches in the repository, "master" (git SHA 6ca45404) and "pv". The "pv" branch (git SHA 24470abd) was restructured during the ParaView 4 release to update it to be compatible with VTK 6.x's modularized build system.

The updates to Xdmf in version 2 are summarized in this paper: [1] and this podcast [2]