Richard,
On 16 May 2008, at 14:16, Richard Light wrote:
>>> That is, that dates of birth and death
>>> appear as different properties:
>>>
>>> p:birthplace
>>> p:birthPlace
>>> p:cityofbirth
>>> etc.
>>>
>>> I can see how this diversity arises, due to the harvesting approach
>>> used. However, (and I'm probably showing my ignorance here) couldn't
>>> owl:sameAs statements be added to the database to indicate that
>>> these
>>> are all actually the "same" property?
>>>
>>> p:birthplace owl:sameAs p:birthPlace
>>> etc.
>>
>> Yes, this could be done. The problem is that Wikipedia is huge, and
>> there are tens of thousands of properties covering all sorts of
>> domain. Hence we would need either an automated approach to find
>> those duplicated properties, or lots of volunteers who go through
>> the dataset and find them manually.
>
> Presumably it's possible to put in a SPARQL query to find all the
> properties that have been used? All the properties that relate to
> people?
>
> I'm coming into this from a historical perspective (specifically
> museums), and my interest would be in sorting out the properties
> which relate to:
>
> - people
> - places
> - events
> - dates
> - [museum] objects
>
> Would this be a manageable subset? If so, I'm willing to help. It
> would be interesting, additionally, to map these properties to those
> in the CIDOC Conceptual Reference Model.
You can get an idea of the properties used for a particular kind of
resource by following these steps:
1. Find the class(es) used in DBpedia of that kind of thing. For
example, if you look at a couple of persons, you will find that they
usually have the classes yago:Person100007846 and foaf:Person. Classes
in DBpedia are quite inconsistent, so this is not an easy task.
2. Use a SPARQL query like this to find the properties used for any
particular class:
SELECT DISTINCT ?p
WHERE {
?s ?p ?o .
?s rdf:type <http://dbpedia.org/class/yago/Person100007846> .
}
You can run the query at http://dbpedia.org/snorql .
3. Use a SPARQL query like this to find out how often a particular
property is used (to see if it's worth spending time on it):
SELECT COUNT(*) WHERE { ?s dbpedia2:dateOfBirth ?o . }
4. Find example triples that use a particular property (to see *how*
it's used, and if it's indeed interchangeable with another property):
SELECT ?s ?o WHERE { ?s dbpedia2:dateOfBirth ?o . }
The end result of this process could be triples like this:
dbpedia2:dateOfBirth owl:equivalentProperty dbpedia2:birthdate .
We could load this into the SPARQL endpoint then.
Best,
Richard
>
>
> Richard
> --
> Richard Light
> XML/XSLT and Museum Information Consultancy
> [EMAIL PROTECTED]
>
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