Wikidata

The Genesis of WikiData

The Genesis of WikiData

Links

• WikiBase DataModel
• https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/Q5

Structure

see also https://addshore.com/2018/12/wikidata-architecture-overview-diagrams/ https://www.mediawiki.org/wiki/Wikibase/DataModel/Primer

https://upload.wikimedia.org/wikipedia/commons/c/c2/Wikibase_JavaScript_Data_Model_1.0.svg

Example

Æthelstan King of the English - 927-939

• https://www.wikidata.org/wiki/Q170017

Position Held

• https://www.wikidata.org/wiki/Property:P39

Queen Victoria

• https://en.wikipedia.org/wiki/Queen_Victoria
• https://www.wikidata.org/wiki/Q9439
• http://royal-family.bitplan.com/index.php/Queen_Victoria

Entity:Queen Victoria

Statements
PropertyId/name	value
P18/image
P569/date of birth	24 May 1819
P39/position held	Q9134365/Monarch of the United Kingdom qualifiers -> start:20 June 1837, end:22 January 1901, replaced by:https://www.wikidata.org/wiki/Q20875
P570/date of death	22 January 1901
P20/place of death	Osborne House
P21/sex or gender]	Q6581072/female

Descendants of Queen Victoria

# WikiData SPARQL Query
#
# Wolfgang Fahl 2018-01-06
#
# get childen of queen victoria
SELECT ?child ?childLabel ?genderLabel ?dob
WHERE {
#  
# child
# https://www.wikidata.org/wiki/Property:P40
# Queen Victoria
# https://www.wikidata.org/wiki/Q9439
  wd:Q9439 wdt:P40+ ?child.
# gender
# https://www.wikidata.org/wiki/Property:P21
  ?child wdt:P21 ?gender.
# date of birth
# https://www.wikidata.org/wiki/Property:P569         
  ?child wdt:P569 ?dob
  SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
ORDER BY ?dob

try it!

How Triples are stored in WikiData

Regular triple

WikiData Example Queen Victoria's father

WikiData Example Queen Victoria's father (technically)

WikiData Example Queen Victoria's father (multiple languages)

Queen Victoria's father SPARQL Query

# WikiData SPARQL Query
#
# Wolfgang Fahl 2018-01-06
# see also https://stackoverflow.com/a/48341522/1497139
#
# get father of queen victoria
SELECT ?queenVictoria ?queenVictoriaLabel ?fatherProperty ?fatherPropertyLabel ?father ?fatherLabel
WHERE {
#  
# father
# https://www.wikidata.org/wiki/Property:P42
# Queen Victoria
# https://www.wikidata.org/wiki/Q9439
VALUES (?queenVictoria) {(wd:Q9439)}
VALUES (?property) {(wdt:P22)}
?queenVictoria ?property ?father.
?fatherProperty wikibase:directClaim ?property
SERVICE wikibase:label { bd:serviceParam wikibase:language "fr". }
}

try it!

Import

• https://www.wikidata.org/wiki/Wikidata:Data_Import_Guide
• https://www.wikidata.org/wiki/Q2140665
• https://github.com/maxlath/wikidata-cli
• https://www.wikidata.org/wiki/Wikidata:Tools/External_tools

Virtuoso Import

• http://wikidata.demo.openlinksw.com/sparql -- SPARQL endpoint
• http://wikidata.demo.openlinksw.com/fct -- Faceted Browsing Interface
• https://wikidata.demo.openlinksw.com/describe/?url=http%3A%2F%2Fwww.wikidata.org%2Fentity%2FQ60&gp=16&go=&lp=940&invfp=IFP_OFF&sas=SAME_AS_OFF&distinct=1

Ontology

• https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/Wikibase/+/master/docs/ontology.owl

Tools

• https://github.com/maxlath/wikidata-cli/blob/master/docs/write_operations.md#wd-create-item

What Links Here

• https://www.mediawiki.org/wiki/API:Presenting_Wikidata_knowledge