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1. 1. Attribute specific-use="local" to identify that a file on the webserver is used as supplementary material
   2. Attribute mimetype="[.ext]" to specify the file extension/filetype. Supported values can be found here: https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types.
   3. Attribute xlink:href="supplement/[filename]" to specify the file
   4. Element <label>Download [filetype] file</label> to create a link to the file with the supplementary material. Instead of "Download ... file" other text can be used for the link, for example the title of the supplementary material. In case of multiple supplements, a numbering can be added that refers to numbers in the article itself.

Example:       

<supplementary-material specific-use="local"
                                 mimetype=".xlsx"
                                 xlink:href="supplement/jiff2022.0168_esm.xlsx">
	<label>Download Excel file</label>
</supplementary-material>

Example with multiple files:

<supplementary-material specific-use="local"
                                 mimetype=".xlsx"
                                 xlink:href="supplement/dataset.xlsx">
	<label>Excel file with the complete dataset</label>
</supplementary-material>
<supplementary-material specific-use="local"
                                 mimetype=".pdf"
                                 xlink:href="supplement/interview.pdf">
	<label>Sample interview transcription</label>
</supplementary-material>

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