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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Dear Peter<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>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.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>The updated document is available at</span><span lang=EN-US> </span><a href="https://cwe.ccsds.org/moims/docs/MOIMS-DAI/Draft%20Documents/OAIS%20v3/650x0020_CESG_Aproval_Mod-20200818.doc?Web=0">https://cwe.ccsds.org/moims/docs/MOIMS-DAI/Draft%20Documents/OAIS%20v3/650x0020_CESG_Aproval_Mod-20200818.doc?Web=0</a><span lang=EN-US style='mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>A short list of the changes are:<o:p></o:p></span></p><ul style='margin-top:0cm' type=disc><li class=MsoNormal style='mso-list:l0 level1 lfo3'><span lang=EN-US style='mso-fareast-language:EN-US'>The conformance section 1.4 has been clarified as you suggested and the individual sections are clearly marked as “normative”<o:p></o:p></span></li><li class=MsoNormal style='mso-list:l0 level1 lfo3'><span lang=EN-US style='mso-fareast-language:EN-US'>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. <o:p></o:p></span></li><li class=MsoNormal style='mso-list:l0 level1 lfo3'><span lang=EN-US style='mso-fareast-language:EN-US'>Changed the name of Semantic Information to “Semantic Representation Information” to avoid confusion with Semantic networks etc. The definition has been clarified to <o:p></o:p></span></li><ul style='margin-top:0cm' type=circle><li class=MsoNormal style='mso-list:l0 level2 lfo3'><span lang=EN-US style='mso-fareast-language:EN-US'>“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.”<o:p></o:p></span></li></ul><li class=MsoNormal style='mso-list:l0 level1 lfo3'><span lang=EN-US style='mso-fareast-language:EN-US'>There is a similar change for Structure Information to “Structure Representation Information”, which is now defined as <o:p></o:p></span></li><ul style='margin-top:0cm' type=circle><li class=MsoNormal style='mso-list:l0 level2 lfo3'><span lang=EN-US style='mso-fareast-language:EN-US'>“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”<o:p></o:p></span></li></ul><li class=MsoNormal style='mso-list:l0 level1 lfo3'><span lang=EN-US style='mso-fareast-language:EN-US'>The explanation of Representation Information Networks has been updated, with some new diagrams which we hope make the concept very clear. <o:p></o:p></span></li></ul><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'>We hope that clears the way for progressing OAIS to the next stage.<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'>Regards<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></body></html>