[Paraview] Confusion Over Proper Use of *.pvd Files

[SamuelKey]

Greetings Developers & Users,

It looks to me that I don't understand something
about the interaction of *.pvd files and animation?

I have a file called "abc.results.pvd"   It is a 'Collection'
file with entries like --
    <DataSet timestep="001" part="001" file="abc.m001.t001.vtu" name="rst"/>
The 'timestep' entries run from 001 to 100.
The 'part' entries run from 001 to 004.
That is, I have files for 100 time steps by four parts -- 400 entries.

The source face-sheet works just fine -- I have a single 4-part
object that can be sliced and diced with the Extract Parts
filter, and a time-step slider that runs from 0 to 99 that lets
me examine results at any time step (the deformation is
incorporated into the x,y,z-coordinates of the object at
each time step and is large enough to be easily visable).

Animation.
When I go to animation and select Source as abc.results.pvd,
the Parameter selection offers either Timesteps or Filename
for which I choose Timesteps. The face-sheet correctly shows
that there are 0 to 99 time steps in the object's data set.

Now The Problem.
Only part="001" is animated.  The remaining three parts
are not processed by the animation???  (I can tell visually
and by the time it takes to perform the animation.)

Alternate Approach Tried.
I surmised that the animation-engine might be confused
about the grouping since 'timestep' and 'part' were at the
same level, so I created a family of 100 files "abc.tnnn.pvd"
where nnn ran from 001 to 100, that is, the entries were of
the form
    <DataSet part="001" file="abc.m001.t001.vtu" name="rst"/>
The PVDReader was only asked to group 'parts.' Again the
source face-sheet worked as before now seeing the time steps
via the sequential file names.

Animation --Same Problem as Before.
The Parameter selection this time was by Filename and
100 time steps were appropriately identified. However,
as before, only the portion of the object identified by
part="001" was animated???

Where am I going wrong?

Regards,

SamKey
(ps: name="rst" is a new entry that will show up on the
Extract Parts filter face sheet in PV version 1.10, courtesy
of Brad King -- a very welcome addition for ease-of-use.)