On 12/31/2011 5:21 AM, Gerard de Melo wrote:
DBpedia's ontology is extremely shallow with just 320 classes based on
infobox types.
Many Wikipedia pages do not have infoboxes and hence the corresponding
instances lack
any genuine class. The advantage of this approach is that it is fairly
accurate.
Recall is poor but precision is excellent.
I went looking in DBpedia 3.5 for topics that were mistyped as
:Person and only found four. I can't say there aren't any others, but
usually I find a lot more trouble when I go looking for it.
Freebase used machine learning methods to find :Person(s) in their
database and got about 2x better recall against people documented in
Wikipedia than DBpedia does. I haven't tried quality checking against
it, however.
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