[linux-dvb] Organizing ALL device data in linuxtv wiki

H. Langos henrik-dvb at prak.org
Fri Nov 13 17:08:50 CET 2009


Hi Devin,

I'm sorry. I just realized that I was only subscribed to linux-dvb but 
not to linux-media. I fixed that now but my reply to your emails will 
not have the correct In-Reply-To/References headers.

> I have to wonder if maybe we are simply using the wrong tool for the
> job.  Perhaps it would make sense to make a really simple web frontend
> to a simple database for devices.  At least initially it would only
> really need two tables.  Something along the lines of the following
...
> A simple db frontend like the above would allow users to search on
> most of the relevant properties they care about (seeing all devices by
> a single manufacturer, looking up devices by USB ID or PCI ID, looking
> for devices that support a certain standard, etc)

I've spent some time discussing the pro and contra of an external database
versus a wiki based approach with some of the other wiki admins:
http://www.linuxtv.org/wiki/index.php/User_talk:Hlangos#Further_ramblings...

The most important point there I guess is, that writing a database app is
a piece of cake and a rather nice way of brushing up on one's SQL foo, 
but keeping it structure-wise updated for years to come is hard and 
boring work.

Also you have to keep in mind that your database app would need to have
at leasts: revision control, undo, user administration.
I'll not go into details but opening such an application to the public 
would need a good amount of hard work and not to forget, security reviews.
Stuff that the wiki already has, and (most important) somebody else is
doing that boring maintenance work so that we can concentrate on the 
content. 

(I know that user administration could be "borrowed" from the mediawiki
but interfacing those applications will mean that you have to keep updating
your code as the mediawiki code evolves.)

> I feel like the freeform nature of wikis just lends to the information
> not being in a structured manner

True, true.

> I don't doubt that a wiki can be mangled to do something like this, 

Well. I had some doubts in the begining. :-)

> but a real database seems like such a cleaner alternative.

Cleaner, yes. But I'd rather have it dirty and full of information
than clean, static and empty. (Oh no .. there comes the bazaar 
and cathedral metaphor again ... :-) )

The device data is structure wise rather heterogenious. So a relational
database might not be a very efficient way of capturing it.
In my eyes a more valid contendor to the wiki approach would be something
with a document oriented database like couchdb. But still you'd have
to do write all the boring infrastructure stuff like user administration,
history, undo...

TWiki has the ability to rather nicely blend structured data with 
unstructured wiki articles. But I thought it more prudent to get 
something done with the tools at hand than spend still more time 
looking for the perfect tool ;-)

> Just a quick afterthought - bear in mind the schema I proposed is
> something I only spent about two minutes on.  It would almost
> certainly need some more tweaking/cleanup etc.  It meant to
> communicate a concept, so don't get too tied up in the details of the
> exact implementation.


Jim has collected the attributes he deems important here:
http://www.linuxtv.org/wiki/index.php/User:Jimbley#Semantics

Howeever I see some problems with the envisioned level of detail 
regarding linux support when scaled to hundrets of devices:
http://www.linuxtv.org/wiki/index.php/User_talk:Jimbley#Device_Database

We also had a discussion about the different users and the level of
detail they'd need:
http://www.linuxtv.org/wiki/index.php/User_talk:CityK#Help_with_wiki_integration


Two more things:

1.) The wiki approach allows for different "databases" to be maintained
separately (by different people) and still have results shown in one 
resulting table.

This could be useful for Vendor pages (listing all devices by that vendor
independent of the boradcasting standard) or for a broadcasting
standard page that lists all e.g. ATSC devices regardless of wether they
have a USB or PCI interface. The only implication of splitting the 
databases is that you need to add one line in your "querry" for each 
database.


2.) Different devices (regardless of wether they are in the same
"database" or in different ones) can have different sets of attributes.

If you feel that ATSC device should have separate attributes for 
"8VSB" and "QAM" you just simply add those attributes to your
devices and write a table template that will display those 
attributes (and ignore things like "firmware" or "url")

The only attributes I'd like to have in all devices are "vendor",
"device" and "did" (Device ID).

-henrik

PS: As you see from the number of links to widely different pages, 
a wiki is NOT a good solution for discussions. Just to avoid the 
impression that wiki's are my "new hammer". :-)




More information about the linux-dvb mailing list