User interface to filter a table from xml file

I have a personal project that is related to make a KNIME app that user input a XML file and gave to user the names of this columns based in the path of this info in our XML(Because sometimes can be duplicated) and then read the xml extracting only the content selected by our end user.
Someone have some example to share? I have a workflow that I’m trying to develop this solution, but unfortunately I’m struggling in how I can extract this column name properly.
More context: In Brazil, we have many different XML structures, and I'm trying to figure out how I can dynamically offer the end user the opportunity to extract only the information they want, without our workflow being interrupted if the XML version or format changes over time.