[Moims-dai] Reminder of Skype call tomorrow (Tuesday)

Mike Kearney kearneysolutions at gmail.com
Tue Mar 8 13:18:57 UTC 2022

Sorry, out today for medical appointment. 

-=-  Mike

Sent from my mobile thing. 

> On Mar 7, 2022, at 11:16 AM, David Giaretta via MOIMS-DAI <moims-dai at mailman.ccsds.org> wrote:
> Meeting: 10:00 Tuesday (Washington DC time), 1500 UK time, 1600 Paris time.
> *Don't have Skype yet? Download it before you join https://www.skype.com
> Draft agenda:
> Review of agenda
> Work on OAIS-IF design, prototyping and book – Steve will provide a update
> See discussion below about some ideas for usability
> The latest version of the draft GB https://www.dropbox.com/s/efspmhhrxvnhi0o/OAIS-IF%20Rationale%20Scenarios%20and%20Requirements-20211021.docx?dl=0    
> I’ve updated the proposed interfaces and associated javadocs for thee OAIS-IF generic to generic communications. They can be seen at http://www.oais.info/oais-if/javadocs/info/oais/interfaces/oaisif/package-summary.html.
> There are associated changes to the OAIS programming interfaces  http://www.oais.info/oais-if/javadocs/info/oais/interfaces/infomodel/package-summary.html to add functionality which is strongly implied in OAIS Ref Model, particularly about the grouping of RepInfo.
> By the way, it you click on the diagram in javadocs you will get the full size diagram which is easier to read.Interactions – from Steve - https://www.dropbox.com/s/dnftuks5nvixdl0/Interactions_210608.jpg?dl=0
> WHITE BOOK FROM Steve - https://www.dropbox.com/s/n3akm9tpxt7kz58/02_White_Book_Recommended_Standard_OAIS-IF_Draft_191216%20v5.3%2006_ComparedCombined_04_05_220215.pdf?dl=0
> Steve may sent out updated document/diagram
> Ideas for usability:
> One of the key capabilities which an OAIS should be able to provide is Representation Information to accompany the Data Object to make an Information Object which can be understood by its Designated Community, however the OAIS may have more Representation Information, perhaps kept in anticipation of changes in Knowledge Bases. A non-OAIS archive may have some RepInfo so here we focus on OAIS archives but remember that the archive (whether OAIS or not) may return “null” if it cannot supply what is needed, and this may mean that the Data Object cannot be made to be usable by the requestor.
> For those outside the Designated Community the OAIS can get Representation Information which may be enough for the Information to be enough. Alternatively, it may be necessary to Transform the Data Object in order for the Information to be usable by someone in this other group of users.
> Thinking in general about the one requesting information getting enough RepInfo one can think of a number of steps:
> Ask if it already has enough RepInfo e.g. checkUsability which would return
> “true” - which means that there is enough RepInfo so nothing more is needed
> “false” – which means that either more RepInfo [SEE (2)]  OR a Transformation is needed [SEE (3)]
> Options for getting more RepInfo:
> Get everything that the archive has – e.g. the whole RepInfo Network (RIN), at least as a network of pointers BUT
>                                                                i.      If only using pointers then somehow the requestor must be able to recognise the identifiers, which might be OK if they use the same registry
> NOTE: if the Data Object is a FITS file then if the RepInfo is a PDF of the FITS standard then that would be OK because one would see that the RepInfo needed is a PDF reader, which I have.
> if the RepInfo is a piece of DRB then what the requestor needs to recognise is NOT that specific example of DRB but rather the requestor would be looking for the DRB processor which is used to extract information from the combination of the DRB file and the Data Object.
> As an alternative to getting the full RIN then one could get the nearest pieces of RepInfo i.e. the Structure, Semantic and Other RepInfo for the Data Object (which might itself be the DO for some RepInfo).
> If nothing will work then see (3)
> Negotiate a Transformation by sending a list of acceptable formats for the DO – but would need more details such as how Semantics are dealt with. The archive would need to see if any of these formats are acceptable e.g. in terms of Transformational Information Properties.
> Regards
> ..David
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