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+This example shows how to declare and use bidirectional one-to-one, one-to-
+many, and many-to-many relationships between persistent objects. It also
+shows how to work with lazy pointers. All the relationships presented in
+this example declare one side as inverse in order to produce canonical
+database schema.
+
+The example consists of the following files:
+
+employee.hxx
+  Header file defining the 'employee', 'employer', 'position', and 'project'
+  persistent classes as well as the employer-employee (one-to-many),
+  employee-position (one-to-one), and employee-project (many-to-many)
+  bidirectional relationships between them.
+
+employee-odb.hxx
+employee-odb.ixx
+employee-odb.cxx
+employee.sql
+  The first three files contain the database support code and the last file
+  contains the database schema for the employee.hxx header.
+
+  These files are generated by the ODB compiler from employee.hxx using the
+  following command line:
+
+  odb --std c++11 -d <database> --generate-schema --generate-query \
+  --generate-session --default-pointer std::shared_ptr employee.hxx
+
+  Where <database> stands for the database system we are using, for example,
+  'mysql'.
+
+  The --generate-session option is used to enable session support for all
+  the persistent classes in employee.hxx. The --default-pointer option is
+  used to make shared_ptr the default object pointer.
+
+database.hxx
+  Contains the create_database() function which instantiates the concrete
+  database class corresponding to the database system we are using.
+
+driver.cxx
+  Driver for the example. It includes the employee.hxx and employee-odb.hxx
+  headers to gain access to the persistent classes and their database support
+  code. It also includes database.hxx for the create_database() function
+  declaration.
+
+  In main() the driver first calls create_database() to obtain the database
+  instance. It then creates a number of 'employee', 'employer', 'position',
+  and 'project' objects, sets the relationships between them, and persists
+  them in the database. In the next few transactions the driver loads various
+  objects, then accesses and modifies the relationships between them. Finally,
+  the driver performs a database query which uses a data member from a related
+  object in its criterion.
+
+To compile and link the example manually from the command line we can use
+the following commands (using  MySQL as an example; replace 'c++' with your
+C++ compiler name):
+
+c++ -c employee-odb.cxx
+c++ -DDATABASE_MYSQL -c driver.cxx
+c++ -o driver driver.o employee-odb.o -lodb-mysql -lodb
+
+To run the example we may first need to create the database schema (for some
+database systems, such as SQLite, the schema is embedded into the generated
+code which makes this step unnecessary). Using MySQL as an example, this
+can be achieved with the following command:
+
+mysql --user=odb_test --database=odb_test < employee.sql
+
+Here we use 'odb_test' as the database login and also 'odb_test' as the
+database name.
+
+Once the database schema is ready, we can run the example (using MySQL as
+the database):
+
+./driver --user odb_test --database odb_test