Re: [Tracker] Write-back data & default/dummy data

["Juan A. Suarez Romero" <jasuarez igalia com>]

On Tue, 2009-10-27 at 13:50 +0000, Martyn Russell wrote:
> Rather it is the other way round. Say you search for all videos in
> your 
> application and you show or sort by title. If there is no title
> (which 
> can happen on a phone or small device where the user just takes the 
> picture and never fills in a title) - the filename might be called 
> "2009-10-27-$location-$number.jpeg", So should that be used as the
> title 
> in the video? Otherwise apps that need this value have to deal with
> it 
> not existing too. This makes queries potentially complex.

But in this case, COALESCE function proposed by Jurg should be enough,
shouldn't it?

What I really miss from ontologies is to know what properties are
compulsory and what are optional, and those that are compulsory, if they
can lack a value or not. This would help when using a client to know if
we must take in account empty values.

        J.A.