As I understand it, Freebase explicitly rejected inheritance through
subclass relations. Therefore it has no class tree and indirect
inheritance. It is "flat". Every item has to directly have all the
values that pertain to it. Is that right?
Wikidata, on the other hand, follows OWL which uses subclasses to form a
tree. Therefore, information is indirect and queries need to understand
this. If a Property is disambiguating, it can be an instance of an Item
which is ultimately a subclass of https://www.wikidata.org/wiki/Q6545185
"unique identifier". In a system like Wikidata which allows inheritance,
a query needs to follow the tree (unlike Freebase which is flat and you
don't follow any inference). It is possible that a query engine can
cache the result of such an indirect inference, but the raw database
does not need to "flatten" everything like Freebase. Is that OK?
- Jeff
On 2015/01/09 16:30, Thad Guidry wrote:
So Lydia,
Your saying that if I see https://www.wikidata.org/wiki/Q18614948 as a
property on another Property... then that is similar to the Freebase
"disambiguating" flag ?
In Freebase, we have just one flag.... but that is not the case here,
correct ? Wikidata has (or might have) several such "disambiguating"
flags via the property on Property ?
It would be nice, from an API and developer perspective, to not have
to discover all those disambiguating properties....but have only a
master disambiguating property to work with...a single "disambiguator"
flag, just like Freebase has.... is this possible, where someone can
go through an mark all of them as "disambiguating" ?
My hope is that the Wikidata query service could give me nicely
formatted output for claims that only contain disambiguating property
data.... just like the Freebase API example URL that I mentioned at
the beginning of the thread. So hopefuly you guys are saying that is
possible via the property on a Property.
Thad
+ThadGuidry <https://www.google.com/+ThadGuidry>
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