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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