+defgroup "database"
+#==================
+groupdesc="
+ There are two ways to specify a database directory. You can either
+ specify a full path using the database-dir option or a root path
+ using the database-root option. In the latter case, a directory
+ structure matching that of the base-dir argument is created
+ below the given full path.
+
+ The advantage of using database-root is that the base-dir is
+ used to find the relevant database both in create and select mode
+ and you do not have to care for setting the database-dir explicitly.