You are looking at the source code for the YODA database.
It is no such thing as Documentation bundled with this application, but it is an extencive examples and release notes published at http://www.python.eu.org/software/database/Yoda/index_html So, please feel freee to visit this web site and look at those notes. This README contains only "last minute" recomendadtions.
Before you begins, don't forget to install all "prerequired" software to /usr/local/YODA. This software is a python,pyro,BerkleyDB pybsddb3,Ysvc,Yrnd,Yio,Ycrypt and may be other. Please check "Administrators guide" on the web site for full list. When you finish to install things, please don't forget to run pyro ns (Name service) using python from /usr/local/YODA/bin, not you standard Python. Please also note, YODA python have to support threads, BerkleyDB should be also compiled with thread support.
As usual, if in doubdt, ask gandalf@python.eu.org.