[Debtags-devel] Vocabulary updates, part 2

[Erich Schubert]

Hi Enrico,
I'd like to bring up some things I had in my first version - implications.

I'll try to explain with an example:
we have fileformat::oggvorbis I guess. But what if I'm not really
interested in applications that can handle ogg, but I'd like to have
any music format?

For that, we IMHO need something like
fileclass::audio

The clearest combination IMHO would be:
fileencoding::oggvorbis
fileformat::ogg
fileclass::audio

fileencoding::oggtheora
fileformat::ogg
fileclass::video

fileformat::msword
fileclass::textdocument

We can specify this with two apporaches - using "implications" and
encricos "formulas"
While the formulas can express much more of course, I have two
objections to them: first of all, they are designed to be applied to
the database upon query (while I would add implications at edit time,
but that has its own drawbacks), and secondly its like the "enhances"
field with packages - it feels like its specified at the wrong place.

I'd also like to have a clean split between "objective" things such as
used technologies (protocol::smtp, which maybe should be
protocol::mail::smtp) and its use (mail-client, mail-server etc.)
I do have to admit that enricos formulas come in handy here...
(mail-client: role::client && (protocol::smtp || protocol::pop3 ||
protocol::imap) )
I have to think of a way to process them as efficiently as I do with
the "real" tags though...

best regards,
Erich Schubert
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