We have found one software suitable in our database for this conversion.
If you need to export the data from .numbers spreadsheets to XML format and do not have the access to OS X and iWorks, your best option is to download the open source LibreOffice suite and use the Calc program to perform this conversion. Latest versions of LibreOffice added support for iWorks formats so this seems to be the easiest / most convenient workaround to achieve numbers to xml conversion.
Updated: September 13, 2021
NUMBERS
Files with numbers file extension can be traditionally found as spreadsheet format of Apple Numbers application on Mac OS X (macOS), iOS and as web service. Numbers spreadsheets can only be opened in Numbers app, there is no 3rd party program available that can open or convert it to another format.
XML
An xml file extension is commonly used for files written in Extensible Markup Language. An xml file is used in various areas of computer industry and many program languages are just derivatives of XML. These xml files can be opened and edited in any text editor or IDE.
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