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<p class="MsoNormal">Ho Holger,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I like your analogy, but it immediately brings to mind, for me, the question "Why wouldn't it exactly be the case that
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">this version of Word will work with any future version of Windows once available</span>?" Striving hard to ensure backward compatibility ought to be a major objective, even while we move into the
future.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I look at Microsoft, and some of the choices that they have taken to drop backward compatibility in their products, I get really annoyed. I have been working long enough that I have written a lot of docs and presentations that I still
have on my computer. Some are "seminal" and are still relevant, some are merely historical and of value to me. But frequently, when I try to open these older (like even 10 years) Word and PPT files with the current crop of MS tools I get messages that say
"we do not have a clue what to do with this file". That is just sad and really annoying.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And note that it is not that the file is broken, but that the tool no longer supports this older format at all. Happily, in many cases, there are other tools like Open Office that do continue to support the older formats. So I can open
these files in Open Office, save them in a more recent format, and then go back into the new MS Office tools and open these "re-saved" files. It works, but it is awkward, painful, and must be done one by one.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">All of that could be avoided. IMHO, we should, in our own work, attempt to do avoid these kinds of situations wherever we can. I realize that there are situations where we have to make changes to data structures and available operations
sets and features in order to move ahead. That is proper and that is what versioning is for. But please, let's try and not break older stuff when moving forward, and let's try and keep our existing standards up to date with the most current frameworks.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks, Peter<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">CSS-CSTS <css-csts-bounces@mailman.ccsds.org> on behalf of "Holger.Dreihahn@esa.int" <Holger.Dreihahn@esa.int><br>
<b>Date: </b>Tuesday, March 3, 2020 at 11:33 PM<br>
<b>To: </b>John Pietras <john.pietras@gst.com><br>
<b>Cc: </b>CSS-CSTS <css-csts-bounces@mailman.ccsds.org>, CSTS-WG <css-csts@mailman.ccsds.org><br>
<b>Subject: </b>[EXTERNAL] Re: [Css-csts] Forward Frame CSTS WG Review Package on CWE<o:p></o:p></span></p>
</div>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear John,</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thanks a lot, I'll put JPL PS-3 on the agenda. However, I am afraid but it is a consequence of the taken approach that a CSTS Service Specification has this close relation to the CSTS Service Specification
Framework. No problem to be clear on that, but we cannot allow the adoption of newer versions once they are available. This would be like stating 'oh yes, this version of Word will work with any future version of Windows once available...'.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Best regards,</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Holger</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Holger Dreihahn<br>
European Spacecraft Operations Centre | European Space Agency | S-431<br>
+49 6151 90 2233 | </span><a href="http://www.esa.int/esoc"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">http://www.esa.int/esoc</span></a>
<br>
<br>
<br>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">From: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">"John Pietras" <john.pietras@gst.com></span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">To: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">"CCSDS_CSTSWG (css-csts@mailman.ccsds.org)" <css-csts@mailman.ccsds.org>, "Wolfgang Hell" <wo_._he@t-online.de></span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Date: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">03/03/2020 22:42</span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Subject: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">[Css-csts] Forward Frame CSTS WG Review Package on CWE</span>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Sent by: </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">"CSS-CSTS" <css-csts-bounces@mailman.ccsds.org></span>
<o:p></o:p></p>
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<br>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">CSTSWG colleagues ---</span>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">I have been informed that the FF-CSTS prototype testing has successfully concluded with no changes required of the FF-CSTS specification. I have therefore put together a working group review package
and posted it to the CWE at URL:</span> <br>
<a href="https://cwe.ccsds.org/css/docs/CSS-CSTS/CWE%20Private/Future%20Services%20using%20Toolkit/Forward%20Frame%20CSTS/FF-CSTS-922x3r2.2-1200303-CSTSWG_Review.zip"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#0082BF">https://cwe.ccsds.org/css/docs/CSS-CSTS/CWE%20Private/Future%20Services%20using%20Toolkit/Forward%20Frame%20CSTS/FF-CSTS-922x3r2.2-1200303-CSTSWG_Review.zip</span></a>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">The zip file contains 3 files:</span>
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt;font-family:"Arial",sans-serif">An annotated version of the FF-CSTS book, in which the annotation consists of Word markup balloons that identify the reasons for the changes from the internationally-reviewed
Red Book version. Most of these references are to the RIDs that caused them, but a few others refer to changes resulting in test compilations if the ASN.1 modules and typo that were discovered along the way. When the book is ready to go to the Secretariat
for publication, these annotations will of course be removed.</span> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt;font-family:"Arial",sans-serif">An updated copy of the RID resolutions. Note at all RIDs and pseudo RIDs have been resolved, accepted by the WG, and incorporated into the document except the following three,
which all stem from Peter Shames’ request to have the book more explicitly address the role of the FF service in Delay-Tolerant Networking (DTN) and Pater’s subsequent review of the document as a whole:</span>
<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Pseudo RID JPL PS-1: This pseudo RID documents Peter Shames’ request for an explicit discussion of the role of the FF service in Delay-Tolerant Networking (DTN) configurations.
Proposed changes have already been drafted in the book. Those changes have been accepted by the pseudo RID author. If and when the CSTSWG agrees with the changes, pseudo RID JPL-PS-1 will be closed.</span>
<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Pseudo RID JPL PS-2: This pseudo RID documents multiple comments made by Peter Shames on the Red Book. Proposed resolutions for all items in the pseudo RID have been generated,
either as changes that have already been drafted in the book or as explanations of questions asked. All of the proposed resolutions have been accepted by the pseudo RID author. If and when the CSTSWG agrees with the changes, pseudo RID JPL-PS-2 will be closed.</span>
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo5">
<![if !supportLists]><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Pseudo RID JPL PS-3: This pseudo RID deals with the change in the CCSDS Blue Book “boiler plate” introduction to the References sections of CSTS specifications. For reasons
having to do with the close synchronization of CSTS specification versions and CSTS SFW versions, the introductory paragraph now prohibits subsequent versions of the SFW from being used with any given issue of a CSTS specification. This change in approach
has elicited concern by Peter about the desirability and feasibility of essentially maintaining multiple active versions of the SFW book. I have copied the relevant portions of our email exchange at the bottom of this email (below my signature). The most recent
response (today) from Peter is “I am willing to close out the comment, but only if the CSS CSTS WG makes a commitment to a) making sure that this situation] is made blazingly clear, and b) make a commitment to fixing this at the soonest possible opportunity.“</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Pseudo RIDs JLP-PS-1 and JPL-PS-2 only require the WG’s concurrence for their closer. However, JP-PS-3 requires some thought on how to clarify the situation and how the WG will prioritize updating
the MD and TD books. </span><br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">I would like to request that we put pseudo-RID JPL-PS-3 on the agenda for next Thursday’s telecon. I have included the relevant contents of the emails between Peter and myself in the text of pseudo-RID
JPL-PS-3. I would encourage WG members to read through that pseudo RID before next week’s telecon so as many as possible of us will have some understanding of the situation.</span>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Thanks.</span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Best regards,</span>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">John</span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">EMAIL EXCHANGE BWTWEEN PETER SHAMES AND JOHN PIETRAS</span>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Original Comment from Peter: Section 1.9 (References): Regarding the sentence “All other publications in the list are subject to revision, and users of this document are encouraged to investigate
the possibility of applying the most recent editions of the publications (other than the Specification Framework) indicated below.” RID author commented “Is it really true that ALL of these other references are suspect? Even the most recent of them?”
</span></b><br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Response (26 November 2019) This is a variation of the standard boilerplate for all Blue Books, which is ”All publications are subject to revision, and users of this document are encouraged to investigate
the possibility of applying the most recent editions of the publications indicated below” (CCSDS A20.0-Y-4 Cor. 1, February 2015, 3.4.1.8 (a) (2)). Our CSTS modification (which will apply to all CSTS specifications) calls out the fact that a given issue of
a CSTS spec is tied to a single issue of the Framework and so no version of the Framework beyond the one explicitly cited can possibly be applicable to a particular issue of the CSTS spec.
</span><br>
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Reply from Peter (4 December 2019) For sec 1.9 it was what I read as a peculiar shift of language that bothered me. It is always that case the specs are only aligned with those others that are
current at the time of publication. This is not any different for the Framework than for any other doc. And it is entirely possible that a future change may be made to the Framework without necessarily changing all of the other docs that use it. I think what
is different here is that this doc is explicitly tied to the version of the Framework that contains the updates that are require to support FF-CSTS. I think you can just state that somewhere in the doc.</span></b>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Pietras esponse to reply (24 February 2020) In response to the statement “I think what is different here is that this doc is explicitly tied to the version of the Framework that contains the updates
that are required to support FF-CSTS.” That statement is not exactly true, because although future versions of the Framework could theoretically also be used by “this” version of the FF spec insofar as the functionality defined therein doesn’t change for the
procedures that are used by FF, there are version-specific numbers that are embedded in the SFW ASN.1 modules that increment with every version of the SFW and the FF procedures are tied to the specific SFW version numbers. A CSTS will work with *<b>only</b>*
the version of the SFW that is specified in the Reference Documents section. And that’s just not FF-CSTS: it’ll be true for every CSTS. Plans for the next revision of the CSTS Guidelines are to include that re-wording of the boilerplate for all CSTS specifications.
</span><br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">So it’s not that this is a one-off situation for FF-CSTS, it’s something that has to be addressed for all CSTS specifications. The WG chose to address it right up front, and to explicitly clarify
that the boilerplate statement “</span><span style="font-size:12.0pt">users of this document are encouraged to investigate the possibility of applying the most recent editions of the publications indicated below”
</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif">does not, and cannot, apply to the SFW. The feeling of the WG was that if this was left “unchallenged” in the Reference Documents boilerplate the constraint might still be overlooked even
if it were stated somewhere else (later) in the document.</span> <br>
<span style="font-size:12.0pt;font-family:"Courier New""> </span> <br>
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Reply from Peter (2 March 2020): What I am getting from this is that the WG has adopted an SFW and associated standard versioning approach, if I understand it correctly, such that each CSTS spec
is tied to a specific version of the SFW. What this says to me is that there is no stated policy for backwards compatibility such that any future changes to the SFW would continue to be compatible with earlier CSTS specs. If that is truly the case, and I
can understand situations where future changes might break that "rule", the consequence would appear to be that the CSS (and the users of these specs) will have to maintain ALL versions of the SFW forever. This seems really cumbersome at best. Am I misunderstanding
this?</span></b> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Pietras Response to Reply (3 March 2020): I think that you’ve got it right. However, there are a couple of additional points that I should have made: </span>
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo6">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt">Any new CSTS specification will always be written citing the then-current version of the SFW. There will be no option for, say, using the 2-issues-back version of the SFW as the basis of a CSTS. </span>
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo7">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt">The WG’s intention is to update all CSTS specifications to use the latest SFW ASAP (where the “soon” part is a function of available resources and other commitments by the WG). So older version of the SFW
would be “active” only until all CSTS specs are aligned with the “current” SFW, at which point all the older books are truly “silverized”. Note that, like today, people may still choose to implement a silver version of a specification anyway (e.g., for backward
compatibility with the user community) and this approach doesn’t address this issue any better or worse than it’s addressed for other CCSDS Silver books.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span>
<br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Case in point – the forthcoming FF-CSTS book uses “features” of the forthcoming SFW-B-2 (and indeed it was the need for these features that triggered many/most of the changes in SFW-B-2). But SFW-B-2
also changes (and simplifies) some of the data structures used not only by FF but also the already-blue MD and the on-the-verge-of-blue TD services. MD and TD can be changed from the B-1 to B-2 SFW data structures, and the WG intends to create projects to
do so, but that will take time/resources to modify the respective “older” CSTS specs. The already-published MD book uses the SFW-B-1 data structures so it must reference SFW-B-1 or the implementation would be broken. In the case of the not-yet-published TD
book (which also uses the SFW-B-1 data structures, the WG decided to go ahead and publish it with reference to SFW-B-1 in order to get it out the door, even though we know that it will have to be changed in the (near) future (I think the idea is to update
the MD and TD books concurrently). </span><br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo8">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:12.0pt">This may now seem like an administrative headache, but hopefully the changes to core elements of the SFW will settle down in the near future, and new versions of the SFW will only add new features, procedures,
and/or operations that don’t affect existing CSTSes. In that (rosy) scenario, “updating” a CSTS spec to a new SFW will only involve a short Technical Corrigendum that points to the latest SFW issue and relevant paragraphs within that SFW issue.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in">
<span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span> <br>
<span style="font-size:12.0pt;font-family:"Arial",sans-serif">Maybe one way to think about this is that, unlike the other references that CCSDS “encourages [users] to investigate the possibility of applying the most recent editions”, the CSTSWG *<b>knows</b>*
what SFW version will work with the service as specified in the specification and essentially tells users up front not to waste their time thinking about it with respect to the SFW.</span>
<br>
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span></b> <br>
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Peter’s Response (3 March): I am willing to close out the comment, but only if the CSS CSTS WG makes a commitment to a) making sure that this situation is made blazingly clear, and b) make a commitment
to fixing this at the soonest possible opportunity.</span></b><tt><span style="font-size:10.0pt">_______________________________________________</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
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