[Dune-devel] [Dune-Commit] [Commit] dune-grid - 545f73a: Start working on a backup restore facility in YaspGrid

[Oliver Sander]

>>
>> PS: Just read your next mail: Seems like the first point could hold for VTK too,
>> if Paraview tries to verify the XML schema. Also, I dont think we want an XML 
>> parser in dune-grid, do we?
> 
> +1. Adding a dune-grid dependency on an XML parser library would probably create some
> interesting discussions on this list… ;-)

Actually I think I do want one.  VTK reading capabilities in Dune would be very helpful,
but I don't think writing that from scratch is a good idea.  The only XML parser library
that I am familiar with (tinyxml2 http://grinninglizard.com/tinyxml2docs/index.html)
is so small that we may just copy the whole thing into dune-common (the license permits that).

--
Oliver



> 
> One thing I just noticed: Any file format should definitely contain a version marker, just
> In case someone comes along and implements an awesome new feature that requires storing
> additional data. I don’t necessarily propose supporting parsing multiple format versions, just add
> a little check at the start and throw a tantrum if the version number is not what we expect…
> 
> Steffen
> 
> 
>>
>>
>> On Thu, Oct 2, 2014 at 1:23 PM, Oliver Sander <sander at igpm.rwth-aachen.de> wrote:
>> Am 02.10.2014 um 13:20 schrieb Oliver Sander:
>>> Am 02.10.2014 um 13:10 schrieb Oliver Sander:
>>>> Am 02.10.2014 um 13:02 schrieb Dominic Kempf:
>>>>> Hey Oliver,
>>>>> Yes, I was writing my very own ascii thing. I mad several assumptions when
>>>>> thinking about the format:
>>>>> 1) All grids to be restored were saved through the same facility. For all
>>>>> other uses, one should consider the dgfparser.
>>>>> 2) The amount of data to be stored is rather small (even for tensorproduct
>>>>> grids)
>>>>> 3) The output should be readable by the human eye.
>>>>> With these in mind, I decided, that a self-defined self-explanatory ascii
>>>>> format will be most the most efficient (in the sense of coding time) way to
>>>>> achieve it. If you provide good reasons for a more standard format, I could
>>>>> reconsider though.
>>>>
>>>> Hi Dominic,
>>>> I have no compelling reason for your use case, I am simply not a fan of reinventing
>>>> yet another file format.  Earlier this week I wrote VTK file reading for an application
>>>> of mine, and that was simple and pretty using tinyxml2.
>>>> If you think that "for all other uses, one should consider the dgfparser",
>>>> how about using the dgf format for backup/restore right away?
>>>
>>
>> [apologies for the previous empty mail]
>>
>> It appears that the vtk format also supports tensor-product grids natively
>> ("RectilinearGrid").  Using that would allow to visualize backup files in
>> Paraview.
>> Best,
>> Oliver
>>
>>
>>>
>>>
>>>
>>>>
>>>> Best,
>>>> Oliver
>>>>
>>>>
>>>>> Best,
>>>>> Dominic
>>>>>
>>>>> On Thu, Oct 2, 2014 at 12:52 PM, Oliver Sander <sander at igpm.rwth-aachen.de>
>>>>> wrote:
>>>>>
>>>>>> Hi Dominic,
>>>>>> great you're working on the restoring facility.  From browsing the commit
>>>>>> logs it seems like
>>>>>> you are inventing a new ascii format.  Did you consider something
>>>>>> standard, like XML or similar?
>>>>>> Thanks,
>>>>>> Oliver
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>>
>>>
>>>
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>>
>>
>>
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