Nokogiri Builder will omit xmlns attribute if already used - ruby

Question

I'm trying to build an xml spreadsheet that contains styles that will be opened in excel.
This is my code:
res = Nokogiri::XML::Builder.new(encoding: 'UTF-8') do |xml|
xml.Workbook 'xmlns' => "urn:schemas-microsoft-com:office:spreadsheet",
'xmlns:o' => "urn:schemas-microsoft-com:office:office",
'xmlns:x' => "urn:schemas-microsoft-com:office:excel",
'xmlns:html' => "http://www.w3.org/TR/REC-html40",
'xmlns:ss' => "urn:schemas-microsoft-com:office:spreadsheet" do
xml.WorksheetOptions "xmlns" => "urn:schemas-microsoft-com:office:excel" do
xml.PageSetup do
xml.Layout "x:Orientation" => "Landscape"
xml.Header "x:Data" => "&LLeft side&CCenter&R&D &T"
xml.Footer "x:Data" => "&CPage: &P / &N"
end
xml.Unsynced
xml.FitToPage
xml.Print do
xml.FitHeight 20
xml.ValidPrinterInfo
xml.Scale 90
xml.HorizontalResolution -4
xml.VerticalResolution -4
end
xml.Zoom 125
xml.PageLayoutZoom 0
xml.Selected
xml.Panes do
xml.Pane do
xml.Number 3
xml.ActiveRow 8
xml.ActiveCol 4
end
end
xml.ProtectObjects "False"
xml.ProtectScenarios "False"
xml.AllowFormatCells
xml.AllowSizeCols
xml.AllowSizeRows
xml.AllowSort
xml.AllowFilter
xml.AllowUsePivotTables
end
end
end.to_xml
puts res
I had this as a working template for years (I was using bunlder's builder before which now is just too slow) and now that I switched to Nokogiri it's not working anymore. Basically this: "xmlns" => "urn:schemas-microsoft-com:office:excel" in the WorksheetOptions tag get's ignored and is not added to the document. Here is the actual result:
<?xml version="1.0" encoding="UTF-8"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
<WorksheetOptions>
<PageSetup>
<Layout x:Orientation="Landscape"/>
<Header x:Data="&LLeft side&CCenter&R&D &T"/>
<Footer x:Data="&CPage: &P / &N"/>
</PageSetup>
<Unsynced/>
<FitToPage/>
<Print>
<FitHeight>20</FitHeight>
<ValidPrinterInfo/>
<Scale>90</Scale>
<HorizontalResolution>-4</HorizontalResolution>
<VerticalResolution>-4</VerticalResolution>
</Print>
<Zoom>125</Zoom>
<PageLayoutZoom>0</PageLayoutZoom>
<Selected/>
<Panes>
<Pane>
<Number>3</Number>
<ActiveRow>8</ActiveRow>
<ActiveCol>4</ActiveCol>
</Pane>
</Panes>
<ProtectObjects>False</ProtectObjects>
<ProtectScenarios>False</ProtectScenarios>
<AllowFormatCells/>
<AllowSizeCols/>
<AllowSizeRows/>
<AllowSort/>
<AllowFilter/>
<AllowUsePivotTables/>
</WorksheetOptions>
</Workbook>
If I write anything else as the xmlns attribute on this line xml.WorksheetOptions "xmlns" => "urn:schemas-microsoft-com:office:excel" do it will work and get added correctly to the document.
This is wrong, apparently excel will not set the page properly if that attribute is missing. Is this a correct behavior for Nokogiri?
If it is, is there any other way to make excel apply the correct page layout to the document?
This happens with another tag that I didn't include in the example, otherwise it would have been too long. This is the other one: xml.DocumentProperties("xmlns" => "urn:schemas-microsoft-com:office:office") do.

Answer 1

I'm not sure about the builder interface, but you can always add it directly to a node by using add_namespace with a nil namespace:
node.add_namespace(nil, "urn:schemas-microsoft-com:office:excel")
See the documentation on Node#add_namespace for details.