[Moims-dai] [EXTERNAL] RE: CESG conditions on your OAIS Reference Model, CCSDS 650.0-P-2.0

Thu Aug 20 14:04:56 UTC 2020

Don’t know if this helps, but given John’s and Mark’s concerns…  

Peter needs to be reminded that this is a recommended *practice*.  Basically, it’s a process document.  And a system can be a process with people, etc.  (as John and Mark pointed out.)

It’s not a recommended *standard* (blue book) which alternatively defines systems to the level of detail that that enables interoperability (between HW/SW systems).  

Occasionally, when contrasting the current body of published works to OAIS-IF (Interoperability Framework), we have referred to the RM for OAIS, IPELTU, 16363, PAIMAS as the Process Framework, as contrasted with the Interoperability Framework.  They are magenta or green books, and they are process-oriented.  They are the foundation for the next phase, the recommended standards (blue books) that we’re about to develop as part of OAIS-IF.  The ADD, the AAL, the plug-ins.  Those will be blue book interoperability systems.  Peter needs to understand the distinction between our Process Framework and our Interoperability Framework.  

   -=- Mike

Mike Kearney

Huntsville, Alabama, USA 

From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org> On Behalf Of garrett at his.com
Sent: Thursday, August 20, 2020 2:06 AM
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org>
Subject: Re: [Moims-dai] [EXTERNAL] RE: CESG conditions on your OAIS Reference Model, CCSDS 650.0-P-2.0

Hi,

Sorry, I’m not totally comfortable with the OAIS definition update suggested by Peter.

I would propose the following OAIS definition that updates Peter’s updates a bit.

I’ve also put a portion of the old definition into a NOTE.

When the current definition is put into SANA or any other glossary and it is not in this document having references to other sections doesn’t make sense.

Previous definition:
Open Archival Information System (OAIS): An Archive consisting of an organization  of people and systems, which has accepted the responsibility to preserve information and make it available for a Designated Community. The organisation may be part of a larger organisation. It meets a set of responsibilities, as defined in section 4, that allows an OAIS Archive to be distinguished from other uses of the term ‘archive’. The term ‘Open’ in OAIS is used to imply that this Recommended Practice and future related Recommended Practices and standards are developed in open forums, and it does not imply that access to the Archive is unrestricted.

Peter’s proposed updates in Blue, mine in Green.

Open Archival Information System (OAIS): An Archive system consisting of, but not limited to, people, procedures, hardware, software, and information. The Archive system may be built upon other subsystems and is developed and operated by an organization.  The organization has accepted the responsibility to preserve information and make it available for a Designated Community. The organization may be part of a larger organization. An OAIS Archive meets a set of mandatory responsibilities that allows an OAIS Archive to be distinguished from other uses of the term ‘archive’.

NOTE: The set of mandatory responsibilities an OAIS Archive must perform are defined in section 4. The term ‘Open’ in OAIS is used to imply that this Recommended Practice and future related Recommended Practices and standards are developed in open forums, and it does not imply that access to the Archive is unrestricted.

Previous definition:
Open Archival Information System (OAIS): An Archive consisting of an organization  of people and systems, which has accepted the responsibility to preserve information and make it available for a Designated Community. The organisation may be part of a larger organisation. It meets a set of responsibilities, as defined in section 4, that allows an OAIS Archive to be distinguished from other uses of the term ‘archive’. The term ‘Open’ in OAIS is used to imply that this Recommended Practice and future related Recommended Practices and standards are developed in open forums, and it does not imply that access to the Archive is unrestricted.

Also in the attached version, I’ve moved the notes about normative or informative (non-normative) to be the first sentence of the sections where they appear rather than burying the sentence near the end first paragraph or the end of the subsection.

Note that it seems as if the proofing language was changed in some spots.  I assume Tom will return them to the proper language settings.

May there be peace in your life,

-JOhn

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: Wednesday, August 19, 2020 6:58 PM
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org <mailto:moims-dai at mailman.ccsds.org> >
Subject: Re: [Moims-dai] [EXTERNAL] RE: CESG conditions on your OAIS Reference Model, CCSDS 650.0-P-2.0

Hi,

Peter’s updated definition has removed the concept that an Archive includes people and other systems.

May there be peace in your life,

-JOhn

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: Wednesday, August 19, 2020 1:45 PM
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org <mailto:moims-dai at mailman.ccsds.org> >
Subject: Re: [Moims-dai] [EXTERNAL] RE: CESG conditions on your OAIS Reference Model, CCSDS 650.0-P-2.0

Dear all

I did not see any objections to Peter’s proposals. I can certainly live with them.

If I do not receive any objections then I will agree with Peter tomorrow. 

Regards

..David

From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org <mailto:moims-dai-bounces at mailman.ccsds.org> > On Behalf Of Shames, Peter M (US 312B) via MOIMS-DAI
Sent: 18 August 2020 18:56
To: david at giaretta.org <mailto:david at giaretta.org> 
Cc: Shames, Peter M (US 312B) <peter.m.shames at jpl.nasa.gov <mailto:peter.m.shames at jpl.nasa.gov> >; MOIMS-DAI List <moims-dai at mailman.ccsds.org <mailto:moims-dai at mailman.ccsds.org> >
Subject: Re: [Moims-dai] [EXTERNAL] RE: CESG conditions on your OAIS Reference Model, CCSDS 650.0-P-2.0

Dear David, et al,

I'd like to thank you and your team for taking my suggestions seriously and for working diligently to improve the clarity of the document.  I am really glad that you took this opportunity to make these long overdue changes.  I suspect that your community will also appreciate the changes.

I have read the document (a quick skim this time), and find that I agree with all of the changes that you have made.  The added clarity in use of terms and diagrams helps a lot.  I did find a few relatively minor items that I still wish to ask that you fix.  Instead of doing the usual "change this to that" PID format I just made the proposed changes directly in the text, which I have attached with Track Changes turned on.  For transparency, I will tell you where to look:

Sec 1.1: fixed the definition of an OAIS to align with the usual notion of what a "system" is:

An OAIS is an Archive system consisting of hardware, software, and procedures developed and operated by an organization.  The organization has accepted the responsibility to preserve information and make it available for a Designated Community. The organization may be part of a larger organization.

Made the same change in sec 1.6.2 Terminology.

In other sections and sub-sections I added a clarifying sentences in the intro paragraphs, of the general form: "This sub-section (or this entire section) is non-normative.".  I am concerned that without this sort of clarity the mix of normative and non-normative materials in various sections can cause confusion.  I did not want it to be too intrusive, but I think we must be clear. 

To take the "sting" out of this, in some sections I added an explanatory sentence, like this one in Sec 4.2:

This entire subsection is informative, but provides useful abstractions for understanding how an OAIS might be designed.

I hope that you and your team can accept these changes.  If the answer is yes you have my concurrence to go forward.

Thanks, Peter

From: David Giaretta < <mailto:david at giaretta.org> david at giaretta.org>
Date: Tuesday, August 18, 2020 at 9:07 AM
To: Peter Shames < <mailto:peter.m.shames at jpl.nasa.gov> peter.m.shames at jpl.nasa.gov>
Cc: MOIMS-DAI List < <mailto:moims-dai at mailman.ccsds.org> moims-dai at mailman.ccsds.org>
Subject: Re: [Moims-dai] [EXTERNAL] RE: CESG conditions on your OAIS Reference Model, CCSDS 650.0-P-2.0

Dear Peter

Steve Hughes provided us with feedback following your discussion with him. As a result we have taken an in-depth look at the conformance sections, the definitions and discussion of Representation Information, and in particular “Semantic Information”, and the discussion of Representation Information Networks. I believe we have made significant improvements to OAIS as a result. Some of the  text dates back to the original version of OAIS; it is only thanks to your insistence that we were forced to recognize a number of weaknesses and sources of confusion for readers.

The updated document is available at https://cwe.ccsds.org/moims/docs/MOIMS-DAI/Draft%20Documents/OAIS%20v3/650x0020_CESG_Aproval_Mod-20200818.doc?Web=0

A short list of the changes are:

-          The conformance section 1.4 has been clarified as you suggested and the individual sections are clearly marked as “normative”

-          We checked the use of shall/must. One instance of “must” was missing from a section marked as normative. We found we did have some uses of “must” in informative sections, which we re-phrased. 

-          Changed the name of Semantic Information to “Semantic Representation Information” to avoid confusion with Semantic networks etc.  The definition has been clarified to 

o   “Semantic Representation Information: The Representation Information that further describes the meaning of the Data Object, and its parts or elements, beyond that provided by the Structure Representation Information.”

-          There is a similar change for Structure Information to “Structure Representation Information”, which is now defined as 

o   “Structure Representation Information: The Representation Information that imparts information about the arrangement of and the organization of the parts or elements of the Data Object”

-          The explanation of Representation Information Networks has been updated, with some new diagrams which we hope make the concept very clear. 

We hope that clears the way for progressing OAIS to the next stage.

Regards

..David

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