The getting_started.py shows some basic import and export functions of the package and is a great place to start!
The folder files contains some example CityGML files you should be able to use any CityGML 1.0 or 2.0 file.
This script shows you how you can load CityGML files to the package and perform some operations, like searching the dataset.
This script introduces you to the check_for_party_walls function, which searches the loaded dataset for adjacent walls and displays them using a PySide6 GUI.