[Moims-dai] Clarifications about Descriptive Information and Package Description

[Caillet Claire]

Hi David,

Yes it helps ! Thanks. I agree we should add some clarifications in the update on this point.
Have a nice day.
_______________________________________________________________________
[cid:image002.jpg at 01D26749.F0875440]Claire Caillet
CNES
DNO/ISA/VIP

Centre Spatial de Toulouse
Tel.: +33 5 61 28 14 38
e-mail : claire.caillet at cnes.fr<mailto:claire.caillet at cnes.fr>

18 Avenue Edouard Belin
31 401 Toulouse Cedex 4
FRANCE
_______________________________________________________________________

De : MOIMS-DAI [mailto:moims-dai-bounces at mailman.ccsds.org] De la part de David Giaretta
Envoyé : mercredi 4 janvier 2017 14:56
À : 'MOIMS-Data Archive Ingestion'
Objet : Re: [Moims-dai] Clarifications about Descriptive Information and Package Description

Hi Claire

Let me take a shot at this.

OAIS defines
Descriptive Information: The set of information, consisting primarily of Package Descriptions, which is provided to Data Management to support the finding, ordering, and retrieving of OAIS information holdings by Consumers.

So the two are related. However the definitions allow Descriptive Information to have more than just the Package Descriptions in order to support for example the retrieving the information. But it is important that the Descriptive Information is primarily Package Descriptions because the Package Descriptions are part of the AIP and so, for example, if the AIPs are transferred to another repository then the those Package Descriptions can be collected together and provide most of the info needed to support "finding, ordering, and retrieving". The retrieval part must rely on information about, for example, which disk or tape the info is on, and that would of course not be part of the AIP but the repository would certainly know it.

Does that help? If it does then maybe we need something like this in the update.

.>David

From: MOIMS-DAI [mailto:moims-dai-bounces at mailman.ccsds.org] On Behalf Of Caillet Claire
Sent: 04 January 2017 12:59
To: MOIMS-Data Archive Ingestion <moims-dai at mailman.ccsds.org<mailto:moims-dai at mailman.ccsds.org>>
Subject: [Moims-dai] Clarifications about Descriptive Information and Package Description

Dear all,

I just had a discussion about the OAIS with a colleague who is preparing a course for French students and we exchanged for a long time about the difference between the Descriptive Information and the Package Description. We came to the point that we don't see the difference anymore. In the figure 2-3 we talk about "Descriptive Information about the Package" but the Figure 4-13 we have the "Package Description" for things that seem to be the same.
Can someone explain me the difference ? And do you think we should include some clarifications in the OAIS (using the 5-years review) ?

Regards.
_______________________________________________________________________
[cid:image004.jpg at 01D26749.F0875440]Claire Caillet
CNES
DNO/ISA/VIP

Centre Spatial de Toulouse
Tel.: +33 5 61 28 14 38
e-mail : claire.caillet at cnes.fr<mailto:claire.caillet at cnes.fr>

18 Avenue Edouard Belin
31 401 Toulouse Cedex 4
FRANCE
_______________________________________________________________________

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