(debian-policy.info)Obsolete fields<2>
16.2.6 Obsolete fields
----------------------
These are still recognized by ‘dpkg’ but should not appear anywhere any
more.
‘Revision’; ‘Package-Revision’; ‘Package_Revision’
The Debian revision part of the package version was at one point in
a separate control field. This field went through several names.
‘Recommended’
Old name for ‘Recommends’.
‘Optional’
Old name for ‘Suggests’.
‘Class’
Old name for ‘Priority’.
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