As an FAQ you can easily navigate to the sections of interest. It is recommended to start with the NLS_LANG Parameter Fundamentals section first to get a basic understanding of how the NLS_LANG parameter works.
XML to DDL is a set of python programs to convert an XML representation of a schema into a database and vice versa. It can also examine the differences between two databases and emit the ALTER DDL statements required to bring the database up-to-date. This