datastructures-xslx is composed of the following works

jxl
https://sourceforge.net/projects/jexcelapi/
GNU Library or Lesser General Public License version 2.0 (LGPLv2)

with the log4j dependency removed

and

com.incesoft.tools.excel
https://code.google.com/archive/p/sjxslx/ -> https://github.com/davidpelfree/sjxlsx
License: Apache License 2.0

The code will be refactored to the org.xbib package group.