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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Dear all,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>This is not quite right as a response, I think.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>First, WG 4 has not “concluded” that we should not add versioning to 29500. My recollection is that in Prague we decided to park that discussion and focus on the immediate issues raised by the Swiss comments. I think it would be more accurate to state that this topic is still being studied in WG 4.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Secondly, I’m not sure it’s a good idea to list technologies that we use for versioning, either – partly because this risks confusing versioning technology with extensibility mechanisms, and partly because it might be seen to bind us to a certain approach. Stating that we are using Namespaces (a very blunt instrument) for our major changes is potentially a hostage to fortune.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Of course it _<i>may</i>_ be that we conclude not to add any (more) versioning mechanisms to OOXML.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>However, I think it is also likely that we may want to add rich semantics to help consumers know precisely what it is they are consuming – this includes version information but is not limited to it: we may wish to convey information about the status and version of extensions being included, for example.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>And if we decide to make first-class changes to the schemas, I believe we may need a versioning mechanisms then. So if (as seems likely) there is a move to amend 29500 to remove CustomXML, how will we convey to consumers that they are consuming resources that conform to this amended spec? We’re not going to make another global Namespace change are we?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Until we have thoroughly explored these kinds of issues, I propose responding as follows:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>“WG 4 is still studying the topic of versioning in general, and BR is encouraged to participate in those discussions. The current amendment is focused on addressing the particular versioning issue raised <a name="_MailEndCompose"> CH, and does not preclude further work in this area.”<o:p></o:p></a></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>- Alex.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Shawn Villaron [mailto:shawnv@microsoft.com] <br><b>Sent:</b> 22 January 2010 21:56<br><b>To:</b> SC 34 WG4<br><b>Subject:</b> Proposed Response to FPDAM Part 1 BR-0001, et al<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Good afternoon,<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>Here is my proposed draft response for this series of comments. Comments welcome, as always.<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>shawn<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US>WG4 Response<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Rejected.<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>WG4 has conducted extensive research into versioning technology associated with ISO/IEC 29500. Our conclusions are that, absent a clearly specified, unsupported versioning use case, additional versioning technology should not be added to ISO/IEC 29500. The potential consequences of introducing a flawed versioning technology clearly outweigh any potential benefits. <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>Furthermore, ISO/IEC 29500 already supports a number of different mechanisms to enable many versioning scenarios. Here is a sampling of such mechanisms:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b><span lang=EN-US>XML Namespaces –</span></b><span lang=EN-US> Provides for “major” version increments that are not designed to be backward compatible with existing implementations. <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b><span lang=EN-US>Extension Lists –</span></b><span lang=EN-US> Provides for adding orthogonal data in predefined locations within the XML. See Part 1.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b><span lang=EN-US>Parts –</span></b><span lang=EN-US> Provides for adding entirely new payloads into the file container. See Part 2.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b><span lang=EN-US>Alternative Content Blocks –</span></b><span lang=EN-US> Provides for adding multiple renditions anywhere in the XML. See Part 3.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><b><span lang=EN-US>Ignorable Namespaces –</span></b><span lang=EN-US> Provides for adding orthogonal data anywhere in the XML. See Part 3.<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>Given these, and other, mechanisms currently provided for in ISO/IEC 29500, and that such mechanisms provide support for the known versioning use cases, WG4 does not believe we need a new versioning technology. We continue to evaluate new versioning-related use cases, and in the event we find one which cannot be supported by existing versioning technologies, we will consider adding additional versioning technology at that time.<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></div><BR>
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