http://st44cej736t2jpbzaww6vbws6mhs74n5tycyr6b2vuvvreko4yigruqd.onion/talks/debconf-debconf/debconf_specification.mdwn
If multiple packages share a common
purpose they may use a shared toplevel hierarchy,
preferably with the same name as a shared (virtual)
package name (for example, both mutt and elm can use mail-reader , strn and nn could use news-reader ). This shared tree can also be
used as a default, ie a variable news-reader/nntpserver can be used by strn if strn/nntpserver does not exist.