Re: RDF triple assertions live forever?

Sandro Hawke a écrit :
 > (...)
> Now, if I post:
> 
>         I am currently in Belmont, MA, USA. 
>             -- posted Fri Mar 28 11:46:38 EDT 2008
>             -- valid until Fri Mar 28 12:00:00 EDT 2008
> 
> it's basically the same as:
> 
>         I am currently in Belmont, MA, USA, and I hereby swear I shall
>         not leave Belmont, MA, USA before Fri Mar 28 12:00:00 EDT 2008
>             -- posted Fri Mar 28 11:46:38 EDT 2008
> 
> (...)
> 
> For most of the rest of us, I don't think we'll be comfortable making
> promises like that.

It all depends on the way you interpret "valid until".
Anyway, I don't have to take your word when you're telling me you are in 
Belmont, and I don't have to take it either when you're stating that 
this will not change.

I can believe that you think *in good faith* to be in Belmont, while in 
fact you are a prisonner of the Matrix in Palo Alto.

Silimarly, I can believe as well that you thought in good faith, at 
11:46, that you would still be in Belmont untill noon.

I don't know how to manage that kind of uncertainty, e.g. in SPARQL 
queries. All I'm saying is that those uncertainties exist for statements 
; they can exist for metadata about statements as well, and we have to 
live with that.

   pa