[Paraview] PVD file format?

[daniel.lenski at seagate.com]

Hi all,
I am using Paraview to visualize large time-series of data from materials 
simulations.  I've used the file-formats.pdf documentation to convert our 
simulator's file format to ParaView's .VTU unstructured grid format, which 
has been very successful.

I'm having trouble finding information on the PVD file format used to make 
time-series.  It doesn't seem to be documented anywhere.  All I have is a 
few ad-hoc snippets of the file format to go off of:

<VTKFile type="Collection">
  <Collection>
    <DataSet timestep="0000" file="combined.0001.vtu"/>
    <DataSet timestep="0001" file="combined.0002.vtu"/>
    <DataSet timestep="0002" file="combined.0003.vtu"/>
    <DataSet timestep="0003" file="combined.0004.vtu"/>
    <DataSet timestep="0004" file="combined.0005.vtu"/>
    <DataSet timestep="0005" file="combined.0006.vtu"/>
    ...
    ...
  </Collection>
</VTKFile>

Is there any documentation available on this file format?  What I'm most 
interested in is doing non-unit timesteps so that I can produce an 
animation with Paraview with a timescale proportional to the real 
time-scale of the simulation.

Thanks for any advice!

Dan
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