All programs require the installation of Python 3, which can be
obtained at https://www.python.org/downloads/ or through package
managers (depending on the operating system). Current installations
already include pip which is used to install further packages.
In a terminal, run the command
pip3 install lxml bibtexparser bs4
to install the required packages.
In order to run the xsl scripts found in the data directory, an XSL processor like Saxon is required. See doc/XSL.md for details.