[Moims-dai] OAIS-IF Document Tree
kearneysolutions at gmail.com
kearneysolutions at gmail.com
Wed Dec 16 16:41:05 UTC 2020
Roger that on the magenta book. That's how I painted it in the document
tree. However, I think it's more important to decide whether we're going to
have a normative/testable/implementable document or not, and then decide
whether it's green, magenta or blue. We decide what we need, and that
determines the color. I think Steve is still figuring that out.
By the interfaces on the bottom, I think you mean to move the
bindings/adapters under the AAL, right? I considered that, but
traditionally an architecture "umbrella" type document specifies the
interaction between components, like interactions between the user
interfaces and the abstraction layer, and the interactions between the
abstraction layer and the bindings. Hence it constrains both AAL and
bindings/adapters equally, so both AAL and bindings/adapters "report to" the
Architecture document. Or their interfaces (UserIF<---->AAL, and
AAL<---->bindings/adapters) are specified by the Architecture document.
However, if you really think the interfaces between the AAL and the
bindings/adapters, as well as the functioning of the bindings/adapters will
all be specified in the AAL, we can move them under the AAL. But I would
think the user interfaces (PAIS/PAIP/CAIS/CAIP) would equally be specified
by the AAL, so then we're moving everything under the AAL. That doesn't
seem like a good document tree to me. It doesn't look like a functional
decomposition process, as a normal project would see.
However, we can talk about it more. If the consensus is that everything
should be moved under the AAL, we can do that.
Huntsville, Alabama, USA
From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org> On Behalf Of
garrett at his.com
Sent: Wednesday, December 16, 2020 12:59 AM
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org>
Subject: Re: [Moims-dai] OAIS-IF Document Tree
Before I start, I will mention that our CCSDS Project is currently expected
to generate a Magenta architecture book.
I think your first slide is pretty good, except I would put most of the
interfaces on the bottom, right side items should appear under the Archive
Abstract Layer. I also think there will be some direct implementations of
AAL for example a Java or Python implementation. Thinking about it, there
could also be some database implementation works also.
May there be peace in your life,
From: MOIMS-DAI <moims-dai-bounces at mailman.ccsds.org
<mailto:moims-dai-bounces at mailman.ccsds.org> > On Behalf Of
kearneysolutions at gmail.com <mailto:kearneysolutions at gmail.com>
Sent: Tuesday, December 15, 2020 5:23 PM
To: 'MOIMS-Data Archive Interoperability' <moims-dai at mailman.ccsds.org
<mailto:moims-dai at mailman.ccsds.org> >
Subject: [Moims-dai] OAIS-IF Document Tree
Today's telecon had a soul-searching discussion of what an ADD (Architecture
Description Document) is, and what the Blue book that we're currently
developing is. Steve described it's tendency towards focusing on the
details of the Archive Abstraction Layer, and hence we began to discuss
whether the content currently in the blue book is really ADD material or AAL
Blue Book material. This led to a discussion where I said we should have a
document tree, so naturally I got the action to build it.
Attached is a PPT with a first notional cut at a document tree. I'll also
suggest that a Doc Tree figure should actually be in the ADD, or even
perhaps the OAIS Reference Model document (next revision, of course). This
ADD after all, is intended to be the ADD for the OAIS-IF, not an overall
OAIS architecture. The OAIS-IF ADD is subordinate to the OAIS RM, not the
other way around. I did not try to include the shadow-organization of an
ISO Doc Tree. To be complete we should probably do that, and spell out
acronyms. Right now I consider this a working document for us insiders.
A few comments are in the notes of the PPT charts. Two additional charts
from IPELTU and our CMC material are added for reference.
Some background on ADDs: There is only one other in CCSDS, for Cross
Support, the CCSS-ADD, and it is here:
It is a green (informative, not normative) book, and it has a companion
Magenta book (an ARD - Architecture Requirements Document). The ARD is not
in our plan. We could conceivably have a magenta ADD that includes
normative requirements like an ARD.
Some notable statements from the CCSS-ADD (relating them to our OAIS-IF
* The foreword on page ii says: The architecture described in this
document was developed based on the Cross Support Reference Model." Our
counterpart statement is that our ADD is based on the OAIS Reference Model.
* Section 2.1, page 2-1: "The SCCS communications architecture
reference model described in this document establishes a common framework
that provides a basis for developing, providing, and using space
communications cross support services." Our ADD does the same for Archive
* Section 2.2, page 2-1: "This SCCS-ADD Green Book provides the
top-level description of the architecture elements of space communications
cross support." Our ADD should provide the top-level description of the
architecture elements of the OAIS-IF. Seems to me that "Top Level" includes
the entire UML chart that Steve has developed. However, Steve made verbal
reference to focusing on the "gray/green boxes". The document that focuses
on the abstraction layer should be the Archive Abstraction Layer Blue Book.
Our counterpart to the MAL <https://public.ccsds.org/Pubs/521x0b2e1.pdf> .
So there's my notional Doc Tree, and how the ADD relates to it.
Huntsville, Alabama, USA
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