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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Looking at this again, the allowance here may be due to the distinction between the conceptual package model and the physical package model. Clause 8 (in WD
1; clause 9 in the published doc) is Package Model and deals with concepts. The next clause (9 / 10) is Physical Package and deals with mapping those concepts to a particular physical package format.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The statement about permitting an empty string is in the concept clause. 9.2.3.2 in WD 1 (10.1.2.1 in 29500-2:2012) states that physical package formats with
a native way to represent content types (the concept) must use that mechanism while physical package formats without a native way to represent them use the OPC-specific Content Types stream. It is the Content Types stream schema that introduces the regexp
restriction in ST_ContentType. I think that the “empty string” statement could apply to physical package formats with a native way to represent content types.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> eb2mmrt@gmail.com [mailto:eb2mmrt@gmail.com]
<b>On Behalf Of </b>MURATA Makoto<br>
<b>Sent:</b> Monday, April 6, 2015 3:50 PM<br>
<b>To:</b> SC34<br>
<b>Subject:</b> Re: Empty content type?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">But the value of @ContentType is constrained by a<o:p></o:p></p>
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<p class="MsoNormal">regexp in opc-contentTypes.xsd. It does not allow the <o:p></o:p></p>
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<p class="MsoNormal">empty string.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What happens when the Media Types stream has neither <o:p></o:p></p>
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<p class="MsoNormal">an Override element nor a Default element for a part? In <o:p></o:p></p>
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<p class="MsoNormal">that case, "the implementation shall not map this part <o:p></o:p></p>
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<p class="MsoNormal">name to a part" (10.1.2.4 Getting the Content Type of a Part).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I thus believe that <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt"> "The value of the content type is permitted to be the empty string."</span><o:p></o:p></p>
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<p class="MsoNormal"><br>
should be dropped. If we do not drop it, we have to modify <br>
the schema and allow the empty string.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt">Regards,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt">Makoto</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">2015-04-07 6:24 GMT+09:00 Arms, Caroline <<a href="mailto:caar@loc.gov" target="_blank">caar@loc.gov</a>>:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This was my interpretation too. Caroline</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Caroline Arms</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Library of Congress Contractor</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Co-compiler of Sustainability of Digital Formats resource
<a href="http://www.digitalpreservation.gov/formats/" target="_blank">http://www.digitalpreservation.gov/formats/</a></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">** Views expressed are personal and not necessarily those of the institution **</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> John Haug [mailto:<a href="mailto:johnhaug@exchange.microsoft.com" target="_blank">johnhaug@exchange.microsoft.com</a>]
<br>
<b>Sent:</b> Monday, April 06, 2015 2:27 PM<br>
<b>To:</b> SC34<br>
<b>Subject:</b> RE: Empty content type?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A">I interpret it as meaning that the value of an attribute that specifies a content type can be “”?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A">John</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="14c90ebcbfa6b5ef_14c909f1c63c5f09__MailE"></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">
<a href="mailto:eb2mmrt@gmail.com" target="_blank">eb2mmrt@gmail.com</a> [<a href="mailto:eb2mmrt@gmail.com" target="_blank">mailto:eb2mmrt@gmail.com</a>]
<b>On Behalf Of </b>MURATA Makoto<br>
<b>Sent:</b> Friday, April 3, 2015 5:51 PM<br>
<b>To:</b> SC34<br>
<b>Subject:</b> Empty content type?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Folks,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have started to rewrite the spec (by rewriting John's latest <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">text for XAdES) for using media types wherever possible.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">But <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> "The value of the content type is permitted to be the empty string."<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">in 8.2.3 is beyond me.. What does it mean?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Makoto<o:p></o:p></p>
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<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><br>
Praying for the victims of the Japan Tohoku earthquake<br>
<br>
Makoto<o:p></o:p></p>
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