addon.xml

<?xml version="1.0" encoding="UTF-8"?>
<xt:extensions xmlns:xt="http://www.oxygenxml.com/ns/extension"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.oxygenxml.com/ns/extension http://www.oxygenxml.com/ns/extension/extensions.xsd">
    <xt:extension id="oxygenxml.xlsx.import">
        <xt:location href="https://github.com/oxygenxml/oxygenxml.xlsx.import/archive/master.zip"/>
        <xt:version>1.0.0</xt:version>
        <xt:oxy_version>17.0+</xt:oxy_version>
        <xt:type>plugin</xt:type>
        <xt:author>Radu Coravu</xt:author>
        <xt:name>Excel XLSX libraries</xt:name>
        <xt:description xmlns="http://www.w3.org/1999/xhtml">Contribute libraries to Oxygen which make it possible to import Excel 2007 and newer XLSX libraries</xt:description>
    </xt:extension>
</xt:extensions>