On Apr 14, 2014, at 12:14 PM, Dimitris Kontokostas
<jimk...@gmail.com<mailto:jimk...@gmail.com>>
wrote:
On Mon, Apr 14, 2014 at 6:55 PM, Patel-Schneider, Peter
<peter.patel-schnei...@nuance.com<mailto:peter.patel-schnei...@nuance.com>>
wrote:
So each mapping has to explicitly state that the object belongs to owl:Thing?
No, you just need to specify to loweset subclass and the framework adds all the
superclasses / equivalent classes
That's what I was expecting, but I couldn't find anything that talked about
this. What is the source of the superclasses and equivalentclasses? The 3.9
ontology doesn't seem to match up with what is being added. For example
http://www.wikidata.org/entity/Q215627 is equivalent to Person in the 3.9
ontology, but it isn't added in the 3.9 dumps.
And the mapping for Philosopher has to explictly state that the object belongs
to Person, foaf:Person, schema.org:Person, Agent, and owl:Thing? That doesn't
seem right.
My guess is that there is some other bit of software that explicitly puts in
these extra type links.
One reason that I ask is that I would like to not have these extra type links,
so that I can run some experiments.
It is easier to have them in the db and one can programmatically remove them if
needed. This way for example we can request all persons and the query is
answered without reasoning
Unfortunately, it may not be possible to correctly do this removal correctly.
Consider, for example, if the same bit of information in a Wikipedia entry ends
up producing two different types. Then removing what appears to be redundant
type information may in fact remove a separate source of information.
It would also have been nice to have the provenance information show which
mapping was used.
We have some sort of provenance in the .nq files, like where in wikipage this
triple was extracted
Yes, I've seen this, but there is no information that I can see on what mapping
was used.
Best,
Dimitris
peter
PS: [1] doesn't talk about how these extra type links are generated, as far as
I can tell. The only relevant portion of the paper is on page 4: "A mapping
assigns a type from the DBpedia ontology to the entities that are described by
the corresponding infobox."
peter
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