(debian-policy.info)The version of a package

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3.2 The version of a package
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Every package has a version number recorded in its ‘Version’ control
file field, described in Note: Version.

The package management system imposes an ordering on version numbers, so
that it can tell whether packages are being up- or downgraded and so
that package system front end applications can tell whether a package it
finds available is newer than the one installed on the system.  The
version number format has the most significant parts (as far as
comparison is concerned) at the beginning.

If an upstream package has problematic version numbers they should be
converted to a sane form for use in the ‘Version’ field.

Version numbers based on dates

Uniqueness of version numbers