[Moims-dai] Interoperability, Data, Information, and the DC

garrett at his.com garrett at his.com
Mon Jan 18 08:39:22 UTC 2021

Hi Mike,


I have sent a separate response to the David's message today before I worked
my way to your response.


I agree that the MOIMS DAI group was discussing issues regarding whether
OAIS-IF interfaces always required information exchanges vs. data exchanges.

My preference is that individual exchanges could transfer only data.  That
data could become information by previously or subsequently having
representation information.


As for the DC, RepInfo and PDI Information that logically originates in the
AIP is by definition directed at the DC.  They may or may not be enough info
to support the needs of non-DC users.


In addition, archives may hold additional RepInfo and various other
data/information related to the AIPs or the archives operations (Packaging
Info, Definition of AIPs, Catalog Info, reports, billing, DMPs, Design Docs,
etc.)  Much of this may also be exchanged with users (either DC or non-DC).


I'm not sure that it is possible to identify what is of value to the DC or
non-DC audience.  It may be better to identify the source of the info
(logically from one or more AIPs or not from an AIP)


Hope, Health, or Peace,









From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org> On Behalf Of
kearneysolutions at gmail.com
Sent: Sunday, January 17, 2021 2:36 PM
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org>
Subject: [Moims-dai] Interoperability, Data, Information, and the DC


(Changed subject line from the thread below)


There weren't any other responses to David's note below, and we did touch on
data vs. information in the last telecon, but I don't think we resolved
anything.  Correct me if I'm wrong on that.  


I think that the discussion below would benefit form addition of the
"Designated Community".  Moreover, I think what we can promise from OAIS-IF


For the Designated Community, an OAIS-IF archive provides interoperability
of information.  (OAIS RM requires that the designated community can
understand the content of DIPs).  


For those outside the designated community, OAIS-IF only guarantees
interoperability of data.  OAIS-IF allows access and retrieval of data, but
the OAIS-RM compliant archive doesn't guarantee it has the Representation
Information that can be interpreted by those outside the designated


In the latter case, if an OAIS RM compliant archive wants to go the extra
mile and provide Representation Information that even (*some?*) consumers
from outside the Designated Community can understand, then they are welcome
to do that.  But they are not required.  Therefore interoperability of
information is provided for the Designated Community and perhaps others.
But it may be that only interoperability of data is provided outside the
Designated Community.  


Does that ring a bell? (good or bad?)  


   -=- Mike


Mike Kearney

Huntsville, Alabama, USA 


From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org
<mailto:moims-dai-bounces at mailman.ccsds.org> > On Behalf Of
david at giaretta.org <mailto:david at giaretta.org> 
Sent: Tuesday, January 12, 2021 5:58 AM
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org
<mailto:moims-dai at mailman.ccsds.org> >
Subject: Re: [Moims-dai] Reminder of Skype call tomorrow


Hi John


One immediate, absolutely fundamental, question arises from your comments,
for example your first comment:

Although information exchange rather than data exchange is an admirable
goal, I thought main purpose of OAIS-IF was interoperability. I think we
should be aiming for interoperability whether information or data is


The question is "What is interoperability?". We need to agree on that
otherwise we are talking at cross-purposes.


http://interoperability-definition.info/en/ has a definition:

Interoperability is a characteristic of a product or system, whose
interfaces are completely understood, to work with other products or
systems, present or future, in either implementation or access, without any


My understanding was that to have interoperability of information from
different domains, say Solar studies and Meteorology, one needed to be able
to "combine" ("work with") the information from those domains e.g. plot the
heat output from the Sun against weather patterns to see if Global Warming
is caused by the Sun rather than Man. This requires more than just getting
the data - which one can probably do already pretty easily. My belief was
that this is why we are talking about an OAIS-IF - because one of the OAIS
fundamental drivers is about understandability and usability.


Maybe some would think that interoperability is just finding relevant
information e.g. where are is Solar energy output data? Well there are lots
of things that exist already e.g. Google.


Maybe some would think that interoperability is just getting the data from
multiple domains together. Well again that is pretty easy right now. Besides
which isn't the fundamental point in OAIS that we need more than the Data


My question is "What does an OAIS-IF need to do?" in other words , what is
the link to OAIS? Since we said this was not about the internals of the
archives, OAIS-IF is not about the details of preservation, except when one
os transferring (copies of) AIPs to another archive as part of the
preservation strategy. 


To my mind the answer is that it has to deal with
understandability/usability of the information which is encoded in data,
together with evidence about Authenticity.  


Perhaps we can discuss this today.






From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org
<mailto:moims-dai-bounces at mailman.ccsds.org> > On Behalf Of garrett at his.com
<mailto:garrett at his.com> 
Sent: 12 January 2021 02:40
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org
<mailto:moims-dai at mailman.ccsds.org> >
Subject: Re: [Moims-dai] Reminder of Skype call tomorrow




Great start.


I've added a number of comments to help move it forward.


Hope, Health, and Peace,



From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org
<mailto:moims-dai-bounces at mailman.ccsds.org> > On Behalf Of
david at giaretta.org <mailto:david at giaretta.org> 
Sent: Monday, January 11, 2021 2:57 PM
To: MOIMS-DAI List <moims-dai at mailman.ccsds.org
<mailto:moims-dai at mailman.ccsds.org> >
Subject: [Moims-dai] Reminder of Skype call tomorrow


Meeting: 10:00 Tuesday (Washington DC time), 1500 UK time, 1600 Paris time


If you do not receive a notification from Skype then please join it by
clicking the link:

 <https://join.skype.com/ykyu5SIPhSnD> https://join.skype.com/ykyu5SIPhSnD


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Draft agenda:


a.	Updated Draft Green Book





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