[Moims-dai] LTDP workflow: comments from updated version

Boucon Daniele Daniele.Boucon at cnes.fr
Fri Jan 9 13:39:46 UTC 2015

Hi all,

Please find in the email :

1) a PDF file showing the changes in the LTDP workflow between the version we analyzed during the London LTDP meeting, and the December updated version (both sent to the group).

2) my first analysis of how our comments have been taken into account below (with a reminder of these comments).

Please complete my first analysis with your point of view.

I'll then send this to the LTDP.



1 Terminology

*       There are some inconsistencies in the viewgraph and in the document (see also comments in the attached document)
*       Need to compare the terminology and structure for preservation from CASPAR, LTDP and some of the other documents in the bibliography.
*       Concepts should be matched/better align with OAIS terminology (AIP, AIU, AIC. Also, section 5 of OAIS addresses software, versions, and editions.
*       Definitions should be simplified, shortened and made to parallel the figures more. This should be done to better progress on rest of document.
*       Does the labeling of 'archive' refers to an archive process in some general sense, rather than an actual Archive?
*the definitions of the concepts have been simplified, but the alignement with the OAIS terminology is still not ok. There is a mix between OAIS and other elements information that could probably be included in OAIS elements.
* Text explaining Figure 2 should be better aligned with the content of the figure.
*In my opinion, Medatata would better fit the "knowledge" box (figure 2), as it is complementary information for data usage.
* Figure 2: what does PDI contains? For example, shouldn't "Mission/sensor" information be included in PDI as context info?

2 Relationships between concepts

*       Need to clearly identify the role of stewardship: global organization, coordination, decision, ... . This role is broader than the mission archive concerned by the Dataset/PDSC and the preservation workflow.

DB: seems ok in the document
*       Consolidation is a mix of acquisition (e.g gap filling), preservation and evolution (e.g transformation through reprocessing) activities, not ony preservation.
*       Preservation acts on Consolidated Data. Not sure then Preservation should be included in Curation. Shall we then consider a "Curation workflow"
*       Value adding: included in Stewardship or Curation? What's the difference between "Data Record improvement" and "Value adding" in figure 1?

DB: still not clear

3 Steps and content

The following : not taken into account. For example, the activity "Specification of preservation and curation requirements" takes "preservation objective spec" that is "Input" in the explanation text, but appears as "output" in figure 3. It'd be good to have an explanation of the provenance of this spec for example (beginning of workflow) -> explanation of links between the preservation workflow and the concept in figure 1.
*       It should be clarified at what point the workflow begins. That means: after a decision at a management level has been adopted (that means at the stewardship level). Note: this is the first step of the PAIMAS (faisability study before preliminary decision).
*       items in the graphic don't align with the topics in the workflow chart except for consolidation: more correspondence is required
*       some segments of the chart correspond to existing ccsds standards (initialization = paimas, implementation = pais, operations = oais?).  That should be brought out somewhere and the terminology and activities from those standards incorporated into the LDTP workflow.
*       Need for an ending point in the workflow (topic of retirement: this "end point" could be, after the preservation period (defined at the initialization phase), a decision point (keep on maintaining the data set for a time period to define, delete part/all of the data set, transfer the data set).
*       How and where is hardware and software that is needed to access the data handled?
*       the LTDP workflow covers initial acquisition, consolidation and preservation activities.  While there is the opportunity to retrigger the preservation workflow in the operation phase. this aspect could be better developed. See for example the attached figure associated to the diagram dedicated to space missions under phase E and after, where stewardship/management appears in the box at the top, where the "cataloging activity" for all space missions, at the bottom, could be seen as value adding, and where different actions can trigger the process (initial, evolution, review).

Don't hesitate to ask questions.

Best regards,


PS: these comments are gathered and organized from CCSDS discussions and comments.

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