[Wikidata-l] WikiData Categories

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Re: [Wikidata-l] Finding image URL...

Rohan Badlani

3 Jul 2014 3 Jul '14

2:03 a.m.

Hi! I am new to WikiData. I wanted to know how can we get the json belonging to a category. Say I want to access the json belonging to Category 537. If I can get the Json, can you pls specify how I can access this json? Main Aim: I want to know what Category 537 means and the sub categories and topics within this category. Regards! -- *Rohan Badlani* 2nd year undergraduate student, B.E.(Hons), Computer Science, Birla Institute of Technology and Science, Pilani. Email: rohan.badlani(a)gmail.com Phone: +91-9660582805.

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Gerard Meijssen

3 Jul 3 Jul

3:13 a.m.

Hoi, I do not get it.. Wikidata has items not categories, so you get access to the item for a category in the same way as you get access to any other item. Thanks, GerardM On 3 July 2014 11:03, Rohan Badlani <rohan.badlani(a)gmail.com> wrote:

...

Hi! I am new to WikiData. I wanted to know how can we get the json belonging to a category. Say I want to access the json belonging to Category 537. If I can get the Json, can you pls specify how I can access this json? Main Aim: I want to know what Category 537 means and the sub categories and topics within this category. Regards! -- *Rohan Badlani * 2nd year undergraduate student, B.E.(Hons), Computer Science, Birla Institute of Technology and Science, Pilani. Email: rohan.badlani(a)gmail.com Phone: +91-9660582805. _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

Magnus Manske

6:47 a.m.

Hi Rohan, if by category you mean "item", e.g. https://www.wikidata.org/wiki/Q537 the easiest way to get the corresponding JSON is: https://wikidata.org/entity/Q537.json If you want a JSON object for all items with property P537, try: http://wdq.wmflabs.org/api?q=claim[537] See here for many more options to interrogate Wikidata: http://wdq.wmflabs.org/api_documentation.html Cheers, Magnus On Thu, Jul 3, 2014 at 10:03 AM, Rohan Badlani <rohan.badlani(a)gmail.com> wrote:

...

Hi! I am new to WikiData. I wanted to know how can we get the json belonging to a category. Say I want to access the json belonging to Category 537. If I can get the Json, can you pls specify how I can access this json? Main Aim: I want to know what Category 537 means and the sub categories and topics within this category. Regards! -- *Rohan Badlani * 2nd year undergraduate student, B.E.(Hons), Computer Science, Birla Institute of Technology and Science, Pilani. Email: rohan.badlani(a)gmail.com Phone: +91-9660582805. _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

-- undefined

Rohan Badlani

10:10 p.m.

Thanks for an early response. @Magnus: I was able to get the json of the items. Still thanks. However, my exact problem is the following. I had downloaded the wikidata dump from http://dumps.wikimedia.org/wikidatawiki/latest/ There is a file wikidatawiki-20140420-pages-articles-multistream-index which consists of triplets like: 537:114:Q17 which I interpreted as following: 537 - category of the topic (which I am unable to find. I want the details of this item) 114 - page_id of the item Q17. Q17 - which is the item. (JSON: https://www.wikidata.org/wiki/Special:EntityData/Q17.json) I want to know whether my interpretation is correct. If it is correct, how can I get the details abt the category 537. If my interpretation is incorrect, how can I get the wikidata category to which an item belongs to? Thanks and Regards! On Thu, Jul 3, 2014 at 7:17 PM, Magnus Manske <magnusmanske(a)googlemail.com> wrote:

...

Hi! I am new to WikiData. I wanted to know how can we get the json belonging to a category. Say I want to access the json belonging to Category 537. If I can get the Json, can you pls specify how I can access this json? Main Aim: I want to know what Category 537 means and the sub categories and topics within this category. Regards! -- *Rohan Badlani * 2nd year undergraduate student, B.E.(Hons), Computer Science, Birla Institute of Technology and Science, Pilani. Email: rohan.badlani(a)gmail.com Phone: +91-9660582805. _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

-- undefined _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

-- *Rohan Badlani* 2nd year undergraduate student, B.E.(Hons), Computer Science, Birla Institute of Technology and Science, Pilani. Email: rohan.badlani(a)gmail.com Phone: +91-9660582805.

Daniel Kinzler

4 Jul 4 Jul

12:01 a.m.

Am 04.07.2014 07:10, schrieb Rohan Badlani:

...

I had downloaded the wikidata dump from http://dumps.wikimedia.org/wikidatawiki/latest/ There is a file wikidatawiki-20140420-pages-articles-multistream-index which consists of triplets like: 537:114:Q17

I couldn't find documentation for the multistream-index format at <https://meta.wikimedia.org/wiki/Data_dumps>. I can't make sense of it myself offhand. Perhaps ask on the wikitech-l list. I suppose the authority on the question would be Ariel Glenn, perhaps you can get hold of him on IRC. Note that this format is used for all wikis, so it will not contain anything that is specific to Wikidata. It would be the same for Wikipedia. If you figure it out, please add the info to <https://meta.wikimedia.org/wiki/Data_dumps>!

...

which I interpreted as following: 537 - category of the topic (which I am unable to find. I want the details of this item)

It's not a category. Wikidata doesn't use MediaWiki's Category feature for data items at all. Wikipedia does, but there pages generally have multiple categories, identified by name, not a numeric ID. If you want to build a classification graph of the concepts in Wikidata (I'm intentionally avoiding the terms "ontology" and "taxonomy" here), you will have to go by the properties P31 (instance of) and P279 (subclass of) which are used in many (roughly half) of the data items.

...

114 - page_id of the item Q17.

That seems to be correct.

...

Q17 - which is the item. (JSON: https://www.wikidata.org/wiki/Special:EntityData/Q17.json)

It's the page title, which, on wikidata.org, is the same as the item ID. HTH Daniel PS: we are close to providing JSON dumps on a regular basis, and also make the JSON contained in the XML dumps more readable. This will hopefully make analyzing Wikidata less painful. -- Daniel Kinzler Senior Software Developer Wikimedia Deutschland Gesellschaft zur Förderung Freien Wissens e.V.

Jane Darnell

1:40 a.m.

Q17 is Japan, and if you are interested in people from Japan for example, you can do this: http://tools.wmflabs.org/reasonator/?q=7463305 (thanks to Magnus' reasonator tool that can extract category-like info from Wikidata based on properties and qualifiers) On Fri, Jul 4, 2014 at 9:01 AM, Daniel Kinzler <daniel.kinzler(a)wikimedia.de> wrote:

...

Am 04.07.2014 07:10, schrieb Rohan Badlani:

I had downloaded the wikidata dump from http://dumps.wikimedia.org/wikidatawiki/latest/ There is a file wikidatawiki-20140420-pages-articles-multistream-index

which

consists of triplets like: 537:114:Q17

which I interpreted as following: 537 - category of the topic (which I am unable to find. I want the

details of

this item)

114 - page_id of the item Q17.

That seems to be correct.

Q17 - which is the item. (JSON: https://www.wikidata.org/wiki/Special:EntityData/Q17.json)

Scott MacLeod

5:40 a.m.

Jane, Lydia and WikiDatans, These are great and helpful developments, which seem to be quite far along now. Jane and WikiDatans, can you point to similar helpful examples that would distinguish how WikiData Categories and what one can extract with Magnus' reasonator tool from what one can 'extract' with SemanticWiki from WikiData Categories? Lydia, are there any emerging video tutorials (in the manner of some of Google's, for example) of tutorials about WikiData Categories and/or Wikidata itself, in terms of making it very easy to use? Thanks, Scott On Fri, Jul 4, 2014 at 4:40 AM, Jane Darnell <jane023(a)gmail.com> wrote:

...

Am 04.07.2014 07:10, schrieb Rohan Badlani:

I had downloaded the wikidata dump from http://dumps.wikimedia.org/wikidatawiki/latest/ There is a file wikidatawiki-20140420-pages-articles-multistream-index

which

consists of triplets like: 537:114:Q17

which I interpreted as following: 537 - category of the topic (which I am unable to find. I want the

details of

this item)

114 - page_id of the item Q17.

That seems to be correct.

Q17 - which is the item. (JSON: https://www.wikidata.org/wiki/Special:EntityData/Q17.json)

_______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

-- - Scott MacLeod - Founder & President - 415 480 4577 - http://worlduniversityandschool.org - World University and School - like Wikipedia with MIT OpenCourseWare (not endorsed by MIT OCW) - incorporated as a nonprofit university and school in California, and is a U.S. 501 (c) (3) tax-exempt educational organization, both effective April 2010. World University and School is sending you this because of your interest in free, online, higher education. If you don't want to receive these, please reply with 'unsubscribe' in the subject line. Thank you.

Magnus Manske

5:49 a.m.

On Fri, Jul 4, 2014 at 1:40 PM, Scott MacLeod < worlduniversityandschool(a)gmail.com> wrote:

...

Can everyone please stop with the "categories"? Wikidata has items and properties. I assume you mean properties here. As for tools to get to data, * Reasonator [1] is for viewing a single item, and see related items * WDQ [2] is for machine-readable querying of Wikidata; basically, what SPARQL does on SMW * Autolist [3] is for getting "clickable" results from WDQ, intersecting results with Wikipedia (!) categories, and semi-automated editing For more details on these, feel free to email me, or search my blog [4]. Cheers, Magnus [1] http://tools.wmflabs.org/reasonator/ [2] http://wdq.wmflabs.org/ [3] http://tools.wmflabs.org/wikidata-todo/autolist.html and http://tools.wmflabs.org/wikidata-todo/autolist2.php [4] http://magnusmanske.de/wordpress/

...

Lydia, are there any emerging video tutorials (in the manner of some of Google's, for example) of tutorials about WikiData Categories and/or Wikidata itself, in terms of making it very easy to use? Thanks, Scott On Fri, Jul 4, 2014 at 4:40 AM, Jane Darnell <jane023(a)gmail.com> wrote:

Am 04.07.2014 07:10, schrieb Rohan Badlani:

I had downloaded the wikidata dump from http://dumps.wikimedia.org/wikidatawiki/latest/ There is a file wikidatawiki-20140420-pages-articles-multistream-index

which

consists of triplets like: 537:114:Q17

which I interpreted as following: 537 - category of the topic (which I am unable to find. I want the

details of

this item)

114 - page_id of the item Q17.

That seems to be correct.

Q17 - which is the item. (JSON: https://www.wikidata.org/wiki/Special:EntityData/Q17.json)

_______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

-- undefined

Scott MacLeod

6:34 a.m.

Magnus, Thanks for the clarification. Adding some of the resources you shared to the Wiki subject page at WUaS. Cheers, Scott On Fri, Jul 4, 2014 at 8:49 AM, Magnus Manske <magnusmanske(a)googlemail.com> wrote:

...

On Fri, Jul 4, 2014 at 1:40 PM, Scott MacLeod < worlduniversityandschool(a)gmail.com> wrote:

Am 04.07.2014 07:10, schrieb Rohan Badlani: > I had downloaded the wikidata dump from > http://dumps.wikimedia.org/wikidatawiki/latest/ > There is a file wikidatawiki-20140420-pages-articles-multistream-index which > consists of triplets like: > > 537:114:Q17 I couldn't find documentation for the multistream-index format at <https://meta.wikimedia.org/wiki/Data_dumps>. I can't make sense of it myself offhand. Perhaps ask on the wikitech-l list. I suppose the authority on the question would be Ariel Glenn, perhaps you can get hold of him on IRC. Note that this format is used for all wikis, so it will not contain anything that is specific to Wikidata. It would be the same for Wikipedia. If you figure it out, please add the info to <https://meta.wikimedia.org/wiki/Data_dumps>! > which I interpreted as following: > 537 - category of the topic (which I am unable to find. I want the details of > this item) It's not a category. Wikidata doesn't use MediaWiki's Category feature for data items at all. Wikipedia does, but there pages generally have multiple categories, identified by name, not a numeric ID. If you want to build a classification graph of the concepts in Wikidata (I'm intentionally avoiding the terms "ontology" and "taxonomy" here), you will have to go by the properties P31 (instance of) and P279 (subclass of) which are used in many (roughly half) of the data items. > 114 - page_id of the item Q17. That seems to be correct. > Q17 - which is the item. (JSON: > https://www.wikidata.org/wiki/Special:EntityData/Q17.json) It's the page title, which, on wikidata.org, is the same as the item ID. HTH Daniel PS: we are close to providing JSON dumps on a regular basis, and also make the JSON contained in the XML dumps more readable. This will hopefully make analyzing Wikidata less painful. -- Daniel Kinzler Senior Software Developer Wikimedia Deutschland Gesellschaft zur Förderung Freien Wissens e.V. _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

_______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

-- undefined _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

-- - Scott MacLeod - Founder & President - http://worlduniversityandschool.org - World University and School - like Wikipedia with MIT OpenCourseWare (not endorsed by MIT OCW) - incorporated as a nonprofit university and school in California, and is a U.S. 501 (c) (3) tax-exempt educational organization, both effective April 2010.

Gerard Meijssen

6:56 a.m.

Hoi, To confuse you even more, Reasonator knows about Wikipedia categories. What is so exciting is that it is possible to include statements in Wikidata that Reasonator interprets as statements for a query. Reasonator shows you the results from that query. I blogged about a Mr Sinegal [1], in the article are links that include numbers, they show off that these queries are live and will show new numbers when either US musicians or musicians are added in Wikidata. Thanks, GerardM PS I am harvesting information at this time, so you will see updates more or less every fifteen minutes. [1] http://ultimategerardm.blogspot.nl/2014/07/wikidata-bill-sinegal-us-rhythm-… On 4 July 2014 14:49, Magnus Manske <magnusmanske(a)googlemail.com> wrote:

...

On Fri, Jul 4, 2014 at 1:40 PM, Scott MacLeod < worlduniversityandschool(a)gmail.com> wrote:

_______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l

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Markus Krötzsch

8:33 a.m.

On 04/07/14 14:49, Magnus Manske wrote:

...

On Fri, Jul 4, 2014 at 1:40 PM, Scott MacLeod <worlduniversityandschool(a)gmail.com <mailto:worlduniversityandschool@gmail.com>> wrote: Jane, Lydia and WikiDatans, These are great and helpful developments, which seem to be quite far along now. Jane and WikiDatans, can you point to similar helpful examples that would distinguish how WikiData Categories and what one can extract withMagnus' reasonator tool from what one can 'extract' with SemanticWiki from WikiData Categories? Can everyone please stop with the "categories"? Wikidata has items and properties. I assume you mean properties here. As for tools to get to data, * Reasonator [1] is for viewing a single item, and see related items * WDQ [2] is for machine-readable querying of Wikidata; basically, what SPARQL does on SMW * Autolist [3] is for getting "clickable" results from WDQ, intersecting results with Wikipedia (!) categories, and semi-automated editing

Well, and of course some items are used as classes, which might be somewhat related to "categories" (in one of their many uses). For an overview of these, see http://tools.wmflabs.org/wikidata-exports/miga/ To find instances of a particular class, you can then use the tools Magnus already mentioned. Cheers, Markus

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Daniel Kinzler
Gerard Meijssen
Jane Darnell
Magnus Manske
Markus Krötzsch
Rohan Badlani
Scott MacLeod