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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Hi Mike<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>See below for my 2p<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>..David<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal style='margin-left:36.0pt'><b><span lang=EN-US>From:</span></b><span lang=EN-US> MOIMS-DAI <moims-dai-bounces@mailman.ccsds.org> <b>On Behalf Of </b>kearneysolutions@gmail.com<br><b>Sent:</b> 05 January 2021 16:38<br><b>To:</b> 'MOIMS-Data Archive Interoperability' <moims-dai@mailman.ccsds.org><br><b>Subject:</b> [Moims-dai] Telecon follow-ups<o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>Here are two things that I couldn’t get across during our telecon, but I’ll forget them before next week (actually before 5 minutes) unless I write them down. <o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph style='margin-left:54.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo3'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>(1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Does “Null” mean the archive responds with: <o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo6'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>A statement: “Sorry, I don’t have that data that you requested” formed as an information package with the information of that statement?<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo6'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>b.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>A statement: “Sorry, I don’t have that data that you requested” but NOT formed as an information package? <o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo6'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>c.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>No statement. Something called “Null” which is non-responsive, but not even a fully-formed statement? <o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo6'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>d.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Any of the above? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>When I used the term it was in the programming sense that an API might return “NULL”, which is implemented in different ways in different programming languages, but whatever language it is will recognise it as “NULL”. The common interpretation would be “I cannot give you this” perhaps because I do not have it, or maybe I am not allowed or maybe there has been an error – in the latter case in many programming languages one can get a more detailed explanation e.g. “the network dropped out”.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph style='margin-left:54.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo3'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>(2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>In the discussion about whether the AIP is “visible” at the interface, David proposed the scenario where an archive is transferring its contents to another archive, and he proposed that they might request “complete AIPs” as part of that transaction. Previously we discussed whether we should specifically show archive-to-archive transactions, but we concluded that we could meet the needs of the external archive simply using the producer and consumer interfaces, so no special “external-archive-specific” interface was needed for any given archive. With David’s scenario where an archive might request a complete AIP containing object data and RI, does that mean we need to show archive-specific calls? And therefore, Steve’s UML should show archive-to-archive transactions, and an external box called an external archive (different from a producer or consumer)? <o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:54.0pt'><span lang=EN-US>If on the other hand, the “complete AIPs” request might apply to consumers also, then we don’t need to specially show archive-to-archive transactions. But in that case, in the green book, we should probably expand on how such archive-to-archive transactions use the producer and consumer interfaces. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>To my mind anyone could request the “full AIP” contents. In the draft Green Book I just showed this in the OAIS to OAIS interaction because it was convenient to link to the OAIS Preservation Strategies i.e. “hand over the AIPs to another Archive”, which was one of the things Vint Cerf mentioned as necessary I believe, and also something we inserted explicitly in OAIS v3 – no need to repeat all over the place because the idea is to be able to define the APIs that everyone could use. In other words it will make our lives easier if we avoid, as far as possible, having a different API for each of Producer/Consumer/Archive/archive<o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>We can discuss these either by email or at the next telecon. <o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US style='color:#002060'> -=- Mike<o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US style='color:#002060'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>Mike Kearney<span style='color:#002060'><o:p></o:p></span></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US style='color:#002060'>Huntsville, Alabama, USA <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>