Hi Marco,
For your reference this issue about categories has been discussed in [1]
Cheers
Andrea
[1]
http://www.mail-archive.com/[email protected]/msg04348.html
Il giorno 05/lug/2013 18:30, "Marco Fossati" <[email protected]> ha
scritto:
> Hi Andrea,
>
> On 7/5/13 5:46 PM, Andrea Di Menna wrote:
>
>> Hi Kasun,
>>
>> yes you can only use skos:broader property to detect child-parent
>> relationships.
>> If the extraction framework cannot get any parent for one category (e.g.
>> http://dbpedia.org/resource/**Category:1612_establishments_**in_Mexico<http://dbpedia.org/resource/Category:1612_establishments_in_Mexico>)
>> then
>> this category will be noted as a skos:Concept but no skos:broader
>> relationships will be added in the triples file.
>> This is correct and seems to be working ok.
>>
>> Maybe the problem you want to highlight is different:
>> there are categories in Wikipedia which appear to have parents (again,
>> in Wikipedia), but do not compare as subjects in any skos:broader
>> relationships in the skos_categories file?
>>
> Exactly, that's the point.
>
>>
>> This is true (it is true for
>> http://dbpedia.org/resource/**Category:1612_establishments_**in_Mexico<http://dbpedia.org/resource/Category:1612_establishments_in_Mexico>)
>> but
>> I think this is because the current SkosCategoriesExtractor does not
>> take into account category links which are added by templates (as in
>> http://en.wikipedia.org/wiki/**Category:1612_establishments_**in_Mexico<http://en.wikipedia.org/wiki/Category:1612_establishments_in_Mexico>
>> ).
>>
> If you believe this may be seen as a SkosCategoriesExtractor issue, could
> you please report it on Github?
>
>>
>> In my opinion, you could maybe check which are the main templates used
>> for this and add support in the extraction framework.
>> So that all of us can benefit from yout work.
>>
> This is not the focus of Kasun's project. The main objective is to extract
> meaningful (both in terms of usage and semantics) Wikipedia categories in
> order to improve the overall resources type coverage.
> Of course, if he has time, he will investigate the behavior of the SKOS
> extractor.
>
>>
>> Hope this is clear.
>>
> Thank you for all the clarifications, we may consider this thread closed.
> Finally, I would like to invite you to the next Skype coaching session for
> Kasun. I'm currently getting in touch with some Wikipedia category system
> experts and will setup a poll to decide the date and time.
> Cheers!
>
>>
>> Cheers
>> Andrea
>>
>>
>>
>> 2013/7/5 kasun perera <[email protected]
>> <mailto:[email protected]**>>
>>
>>
>> Hi Andrea
>>
>> I'm bit confused.
>>
>> In a previous mail on this thread you mentioned that
>> dbp:A skos:broader dbp:B means that A is a sub-category of B; so I
>> can these relations to build a directed graph (e.g. B -> A) and then
>> find leaves.
>>
>> So what I separated the triples having "skos:broader" and filter out
>> all other triples (this is mentioned here[1]); because I can only
>> use "skos:broader" relationship to detect child-parent relationship
>> right?
>>
>> $ bzgrep "1612_establishments_in_**Mexico"
>> skos_categories_en.ttl.bz2
>> <http://dbpedia.org/resource/**Category:1612_establishments_**
>> in_Mexico<http://dbpedia.org/resource/Category:1612_establishments_in_Mexico>
>> >
>>
>> <http://www.w3.org/1999/02/22-**rdf-syntax-ns#type<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
>> >
>>
>> <http://www.w3.org/2004/02/**skos/core#Concept<http://www.w3.org/2004/02/skos/core#Concept>>
>> .
>> <http://dbpedia.org/resource/**Category:1612_establishments_**
>> in_Mexico<http://dbpedia.org/resource/Category:1612_establishments_in_Mexico>
>> >
>>
>> <http://www.w3.org/2004/02/**skos/core#prefLabel<http://www.w3.org/2004/02/skos/core#prefLabel>>
>> "1612
>> establishments in Mexico"@en .
>>
>> So the category referred to in the issue seems to be there in
>> the file.
>>
>>
>> Yes this is there in the file but it's not a type of "skos:broader",
>> which I can get the parent-child relationship.
>> So first tell me using only the triples with "skos:broader" is
>> wrong? (Then we will come back to my claim "categories that don't
>> have a broader category are not included in dump 2")
>>
>> [1]
>> https://github.com/dbpedia/**dbpedia-links/issues/16<https://github.com/dbpedia/dbpedia-links/issues/16>
>>
>>
>> --
>> Regards
>>
>> Kasun Perera
>>
>>
>>
> --
> Marco Fossati
> http://about.me/marco.fossati
> Twitter: @hjfocs
> Skype: hell_j
>
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