Change the x namespace using openxml

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.NET3.5

C#

.NET

Office

MS-Excel

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Hi Guy's and Girls,

I got a problem when generating een OpenXML Excel worksheet. Specially the stylesheet part.
When the stylesheet somehow got a style for a Timeline (excel 2013 only) it is able to generate a excel-file. The stylesheet then contains the right namespace (xmlns:x="..."). This makes it possible to open it in Excel 2010. But when saving the generated excel-file with Excel 2010 the x-namespace becomes the default namespace an is delete from all ellements, except for the timeline extension element. When re-opening the file in excel, this wil result in an error. When opening the same file in the OpenXml Productivity Tool it comes with the error that x is an unknown namespace.

So here's some xml-result code.
Fisrt after generating the excel file (stylesheet.xml):

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<x:styleSheet xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main" xmlns:x15="http://schemas.microsoft.com/office/spreadsheetml/2010/11/main" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main" mc:Ignorable="x14ac">
  <x:fonts count="3" x14ac:knownFonts="1">
    <x:font>
      <x:sz val="11"/>
      <x:color theme="1"/>
      <x:name val="Calibri"/>
      <x:family val="2"/>
      <x:scheme val="minor"/>
    </x:font>
	<!-- more fonts -->
  </x:fonts>
  <x:fills count="7">
    <x:fill>
      <x:patternFill patternType="none"/>
    </x:fill>
    <!-- more fills -->
  </x:fills>
  <x:borders count="1">
    <x:border>
      <x:left/>
      <x:right/>
      <x:top/>
      <x:bottom/>
      <x:diagonal/>
    </x:border>
  </x:borders>
  <x:cellStyleXfs count="1">
    <x:xf numFmtId="0" fontId="0" fillId="0" borderId="0"/>
  </x:cellStyleXfs>
  <x:cellXfs count="18">
    <x:xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0"/>
    <x:xf numFmtId="14" fontId="0" fillId="0" borderId="0" xfId="0" applyNumberFormat="1"/>
    <x:xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0" applyNumberFormat="1"/>
    <x:xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0" pivotButton="1"/>
    <x:xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0" applyAlignment="1">
      <x:alignment horizontal="left"/>
    </x:xf>
    <!-- more cells -->
  </x:cellXfs>
  <x:cellStyles count="1">
    <x:cellStyle name="Standaard" xfId="0" builtinId="0"/>
  </x:cellStyles>
  <x:dxfs count="1">
    <x:dxf>
      <x:numFmt numFmtId="19" formatCode="m/d/yyyy"/>
    </x:dxf>
  </x:dxfs>
  <x:tableStyles count="0" defaultTableStyle="TableStyleMedium2" defaultPivotStyle="PivotStyleLight16"/>
  <x:extLst>
    <x:ext xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main" uri="{EB79DEF2-80B8-43e5-95BD-54CBDDF9020C}">
      <x14:slicerStyles defaultSlicerStyle="SlicerStyleLight1"/>
    </x:ext>
    <x:ext xmlns:x15="http://schemas.microsoft.com/office/spreadsheetml/2010/11/main" uri="{9260A510-F301-46a8-8635-F512D64BE5F5}">
      <x15:timelineStyles defaultTimelineStyle="TimeSlicerStyleLight1"/>
    </x:ext>
  </x:extLst>
</x:styleSheet>

and after saving in Excel 2010

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<styleSheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" mc:Ignorable="x14ac">
  <fonts count="3" x14ac:knownFonts="1">
    <font>
      <sz val="11"/>
      <color theme="1"/>
      <name val="Calibri"/>
      <family val="2"/>
      <scheme val="minor"/>
    </font>
    <!-- more fonts -->
  <fills count="7">
    <fill>
      <patternFill patternType="none"/>
    </fill>
    <!-- more fills -->
  </fills>
  <borders count="1">
    <border>
      <left/>
      <right/>
      <top/>
      <bottom/>
      <diagonal/>
    </border>
  </borders>
  <cellStyleXfs count="1">
    <xf numFmtId="0" fontId="0" fillId="0" borderId="0"/>
  </cellStyleXfs>
  <cellXfs count="18">
    <xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0"/>
    <xf numFmtId="14" fontId="0" fillId="0" borderId="0" xfId="0" applyNumberFormat="1"/>
    <xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0" applyNumberFormat="1"/>
    <xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0" pivotButton="1"/>
    <xf numFmtId="0" fontId="0" fillId="0" borderId="0" xfId="0" applyAlignment="1">
      <alignment horizontal="left"/>
    </xf>
    <!-- more cells -->
  </cellXfs>
  <cellStyles count="1">
    <cellStyle name="Standaard" xfId="0" builtinId="0"/>
  </cellStyles>
  <dxfs count="1">
    <dxf>
      <numFmt numFmtId="164" formatCode="m/d/yyyy"/>
    </dxf>
  </dxfs>
  <tableStyles count="0" defaultTableStyle="TableStyleMedium2" defaultPivotStyle="PivotStyleLight16"/>
  <extLst>
    <ext uri="{EB79DEF2-80B8-43e5-95BD-54CBDDF9020C}" xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main">
      <x14:slicerStyles defaultSlicerStyle="SlicerStyleLight1"/>
    </ext>
    <x:ext uri="{9260A510-F301-46a8-8635-F512D64BE5F5}" xmlns:x15="http://schemas.microsoft.com/office/spreadsheetml/2010/11/main">
      <x15:timelineStyles defaultTimelineStyle="TimeSlicerStyleLight1"/>
    </x:ext>
  </extLst>
</styleSheet>

as you can see. The <x:ext uri="{9260A510-F301-46a8-8635-F512D64BE5F5}" part still contains the x namespace where it is removed from other ellements.

Anyone know how to fix this? My first thought is removing making the x namespace the default namespace so it no longer requieres the x: in the stylesheet at all. But i wasn't able to find an way to tell the openXML SDK to do so.