Bug#776337: apt: document how multiple contidions in apt_preferences can be combined

[Christoph Anton Mitterer <calestyo@scientia.net>]

Source: apt
Version: 1.0.9.6
Severity: wishlist


Hi.

Right now apt_preferences(5) doesn't really clearly explain
how multiple conditions for pins can be combined (i.e. via
logical AND).

The manpage only gives some implicit documentation via
specifiv examples, e.g.
  Pin: release a=stable, v=8

IMHO it would be nice if it would be more generally explained:
- how multiple conditions are evaluated (i.e. AND)
- how they're syntactically specified, e.g.
  separating them via comma seems to work, like above:
    release a=stable, v=8
  but
    release a=stable, release v=8
  seems to work as well?
  Also the question how to mix different condition types,
  e.g. release with version or origin.

Cheers,
Chris.