Programs like Full Convert are able to export Excel spreadsheets as XML documents. However, XLSX spreadsheet is basically a ZIPed XLM spreadsheet already, so you might want to to look inside and check if you can find what you are looking for.
Convert Microsoft Excel Open XML workbook and spreadsheet to XML document.
We found 7 software records in the database related to .xlsx to .xml file format conversion.
Articles and other information relating to xlsx into xml conversion:
How to convert Excel XLS or XLSX documents to another file format - Saving Excel workbooks to another file type
Microsoft Windows software - convert xlsx to xml on Windows
A program used to create and manage information databases
Convert from xlsx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned xlsx to xml. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A powerful database to database converter
A popular spreadsheet application distributed with Microsoft Office suite
Fully-featured version of Navicat for Windows
Apple macOS / Mac OS X software - convert xlsx to xml on OS X
A database management program for Mac
Multiplatform software - convert xlsx to xml on any platform
Spreadsheet program from OpenOffice.org productivity suite
Full-featured spreadsheet tool from LibreOffice suite