Re: [SMW-devel] Allow null values for semantic properties?

[Temlakos <tem...@gm...>]

Yaron:

Are you sure that's necessary? Whenever I write a semantic template, I 
use {{#if: statements to make sure that no annotation takes place unless 
the relevant parameter exists. And a null number strikes me as a 
show-stopper if we ever wanted to do arithmetic with those annotated 
numbers. Which is something I've always wanted to do.

Temlakos

Yaron Koren wrote:
> Hi,
>
> Currently semantic properties all display a warning message when 
> they're given a null value (e.g., [[Has country::]]). That makes sense 
> if all properties are hand-coded, but if a site uses semantic 
> templates, it could easily end up with many blank values. [1]  Each of 
> those gets a little warning flag, which could make many people think 
> that something horrible has happened. Of course, an administrator can 
> choose to not have warnings displayed, but many don't know how to do 
> that, and sometimes it's useful to see the real error messages. Can 
> warnings for null values be removed? A null value for a number just 
> doesn't strike me as invalid data in the same way that, say, a value 
> of "abcd" would be; I believe most relational databases, for example, 
> allow null values for any type by default.
>
> -Yaron
>
> [1] http://hackerspaces.org/wiki/HacDC
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