I am using xslt to read an xml file and then display it in Microsoft Word. I want to implement checkboxes in my XSLT-files, but it doesn’t work.

Currently it looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<xslt:stylesheet version="1.0"
    xmlns:xslt="http://www.w3.org/1999/XSL/Transform"
    xmlns:o="urn:schemas-microsoft-com:office:office"
    xmlns:w="http://schemas.microsoft.com/office/word/2003/wordml"
    xmlns:wx="http://schemas.microsoft.com/office/word/2003/auxHint"
    xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882"
    xmlns:v="urn:schemas-microsoft-com:vml"
    xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="w14">
    <xslt:output method="xml" encoding="UTF-8" indent="yes"/>
    
    <xslt:template name="Checkbox">
        <w:sdt>
            <w:sdtPr>
                <w14:checkbox>
                    <w14:checked w14:val="0"/>
                    <w14:checkedState w14:val="2612" w14:font="MS Gothic"/>
                    <w14:uncheckedState w14:val="2610" w14:font="MS Gothic"/>
                </w14:checkbox>
            </w:sdtPr>
        </w:sdt>
        <w:sdtEndPr/>
        <w:sdtContent>
            <w:r>
                <w:rPr>
                    <w:rFonts w:ascii="MS Gothic" w:eastAsia="MS Gothic" w:hAnsi="MS Gothic" w:hint="eastAsia"/>
                </w:rPr>
                <w:t>☐</w:t>
            </w:r>
        </w:sdtContent>
    </xslt:template>

…Because this is pretty much what I got when I exported the docx-file to xml.

However when I try to use this, I get an error ‘6102’, which states (roughly translated):
“Elements and attributes are not allowed in restricted namespaces.”

I don’t know what to do…

Thanks!