[hdf-forum] provenance

[Quincey Koziol]

Hi Werner,

On Mar 24, 2009, at 3:57 PM, Werner Benger wrote:

> Would we like to have shared UUID's, such as to specify that "this  
> set of HDF5
> files belongs together"? This could be very useful for files  
> produced during
> some multiprocessor simulation.

	Hmm, that might be better off being specified in some other way,  
perhaps with an attribute on the root group, or as information in each  
file's user block.

	Quincey


> 	Werner
>
>
> On Tue, 24 Mar 2009 15:41:27 -0500, Dimitris Servis <servisster at gmail.com 
> > wrote:
>
>> Hi Quincey
>>
>> if it would be possible to copy it, I would also be interested. My  
>> use case
>> is this: when deleting large objects from the file, I copy all  
>> objects to a
>> new file and delete the old one. But some applications may depend  
>> on the
>> time stamp of the file and therefore I would have to modify the  
>> time stamp
>> of the new file using OS functions. Any unique ID would solve this.
>>
>> thanks!
>>
>> -- dimitros
>>
>> 2009/3/24 Quincey Koziol <koziol at hdfgroup.org>
>>
>>> Hi Matthew,
>>>
>>> On Mar 24, 2009, at 1:32 PM, Matthew Dougherty wrote:
>>>
>>> Is there a unique identifier internally within an HDF file when it  
>>> is
>>>> created?
>>>>
>>>> Something that would distinguish it from another HDF file created  
>>>> two
>>>> seconds later, and cannot be disabled or modified.
>>>> Do not want to use the operating system/file system creation date  
>>>> or
>>>> parameters in fstat, prefer a HDF api.
>>>>
>>>
>>>       That's a good idea...  Would a UUID fit what you are  
>>> thinking?  (
>>> http://en.wikipedia.org/wiki/Uuid)
>>>
>>>               Quincey
>>>
>>> On Mar 24, 2009, at 5:11 AM, Quincey Koziol wrote:
>>>>
>>>>>
>>>>>       BTW, tracking these time for an object can be disabled by  
>>>>> calling
>>>>> H5Pset_obj_track_times() with the 'track_times' parameter set to  
>>>>> FALSE.
>>>>>
>>>>
>>>>
>>>>
>>>
>
>
>
> -- 
> ___________________________________________________________________________
> Dr. Werner Benger <werner at cct.lsu.edu>               Visualization  
> Research
> Laboratory for Creative Arts and Technology (LCAT)
> Center for Computation & Technology at Louisiana State University  
> (CCT/LSU)
> 239 Johnston Hall, Baton Rouge, Louisiana 70803
> Tel.: +1 225 578 4809                        Fax.: +1 225 578-5362
>

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