User:Beat Estermann/WD-Intro-2019-08-21

Useful Links

• Asaf's Gentle Introduction to Wikidata (Youtube)
• Slide Deck of this Course
• Handout: Wikidata in Brief
• Handout: Wikidata Query Service in Brief
• Help:Multilingual
• Wikidata – Project Cultural Heritage
• eCH-0205 – Linked Open Data (Guidelines)
• Wikidata Query Service (SPARQL Endpoint)
• Wikidata Query Service - User Manual
• Vizquery - a tool for making simple queries
• Cradle - a tool to create customized forms to enter data manually
• Histropedia – Wikidata Query Timeline
• Wikidata Ontology Explorer
• Werkzeuge für Freiwillige: Von Wikipedia aus verfolgen, was auf Wikidata vor sich geht (Blog Post by Jens Ohlig, 1 June 2018)

Useful Gadgets

• Gadget "relateditems:" Adds a button to the bottom of item pages to display inverse statements.

To activate it, go to the "Gadget" tab in your preferences and tick the corresponding checkbox.

Explanatory note: For many items Wikidata has more information than can be seen on the item page. For example on Whitcomb L. Judson Whitcomb L. Judson (Q731876) you see that he is an inventor but you don't see his invention. That's because discoverer or inventor discoverer or inventor (P61) only links from the invention to the inventor and not the other way round. To solve this general problem that statements are only displayed in one way the script adds at the end of all item pages a new button to load inverse statements.

• There are further Gadgets that facilitate particular tasks when working on Wikidata - check them out!

Sum of All GLAMs Project

• Wikimania 2019 Session: Bootstrapping the Worldwide Inventory of Heritage Institutions
• "An International Knowledge Base for All Heritage Institutions" (Giovanna Fontenelle and Beat Estermann, 4-5 July 2019).

As suggested in the LDFI Report, a similar approach could be pursued with regard to performing arts related data.

Trivia

• Hatnote: Listen to Wikidata!

Examples of Data Use

Examples of data use in the context of Wikipedia

• Centralized inter-wiki links
• Centralized data management for infoboxes
• Centralized data management for lists
• Mbabel Tool - for the creation of draft articles, including infobox and general article structure, populated with data from Wikidata
• Wikimedia CH campaign at the occasion of the International Museums Day 2018

Examples of data use outside Wikipedia/Wikimedia: external applications

• Histropedia
• The Sum of All Knowledge
• Crotos

Example Queries

Things named after French Presidents

#defaultView:Map
SELECT ?truc ?presLabel ?trucLabel ?coord ?layer WHERE {
 {
 SELECT DISTINCT ?truc (SAMPLE(?coord) AS ?coord) (SAMPLE(?layer) AS ?layer) WHERE {
 ?pres wdt:P39 wd:Q191954 ;
 rdfs:label ?layer.
 FILTER((LANG(?layer)) = "fr")
 
 ?truc wdt:P138 ?pres ;
 wdt:P625 ?coord.
 }
 GROUP BY ?truc ?trucLabel
 }
 SERVICE wikibase:label { bd:serviceParam wikibase:language "fr". }
}

Try it!

Things named after Swiss Federal Councilors

#defaultView:Map
SELECT ?truc ?fcLabel ?trucLabel ?coord ?layer WHERE {
 {
 SELECT DISTINCT ?truc (SAMPLE(?coord) AS ?coord) (SAMPLE(?layer) AS ?layer) WHERE {
 ?fc wdt:P39 wd:Q11811941 ;
 rdfs:label ?layer.
 FILTER((LANG(?layer)) = "fr")
 
 ?truc wdt:P138 ?fc ;
 wdt:P625 ?coord.
 }
 GROUP BY ?truc ?trucLabel
 }
 SERVICE wikibase:label { bd:serviceParam wikibase:language "fr". }
}

Try it!

Plays by Swiss Playwrights

SELECT DISTINCT ?play ?playLabel ?author ?authorLabel
WHERE {
  ?play wdt:P31/wdt:P279* wd:Q25379 ; 
        wdt:P50 ?author .
  ?author wdt:P27 wd:Q39 .
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],de". }
}

Try it!

Plays that Were Performed in Switzerland

SELECT DISTINCT ?play ?playLabel ?author ?premiere ?venueLabel

WHERE {
  ?play wdt:P31/wdt:P279* wd:Q25379 ; 
        wdt:P50 ?author .
  ?production wdt:P31/wdt:P279* wd:Q43099500 ;
              wdt:P144 ?play ;
              wdt:P276 ?venue .
  ?venue wdt:P361*/wdt:P131/wdt:P17 wd:Q39 .
             
  OPTIONAL { ?production wdt:P1191 ?premiere . }
  
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],de". }

}

ORDER BY ?premiere

Try it!

Subclasses of Heritage Institutions

SELECT ?item
       (group_concat(distinct ?superClassLabel_en;separator="; ") as ?superClassLabels_en)    #Concatenate the values in order not to get several rows per item.
       (replace(group_concat(distinct ?superClass;separator="; "), "http://www.wikidata.org/entity/", "") as ?superClasses)   #Strip the path in order to get only the Q-number.        
	   ?Label_en
       (group_concat(distinct ?Alias_en;separator="; ") as ?Aliases_en)    #Concatenate the values in order not to get several rows per item.
       ?Label_de
       (group_concat(distinct ?Alias_de;separator="; ") as ?Aliases_de)
       ?Label_fr
       (group_concat(distinct ?Alias_fr;separator="; ") as ?Aliases_fr)
       ?Label_it
       (group_concat(distinct ?Alias_it;separator="; ") as ?Aliases_it)
       ?Label_es
       (group_concat(distinct ?Alias_es;separator="; ") as ?Aliases_es)
       ?Label_ru
       (group_concat(distinct ?Alias_ru;separator="; ") as ?Aliases_ru)
       ?Description_en       
       ?Description_de
       ?Description_fr
       ?Description_it
       ?Description_es
       ?Description_ru
WHERE {
  {?item wdt:P279+ wd:Q33506} UNION {?item wdt:P279+ wd:Q166118} UNION {?item wdt:P279+ wd:Q7075}.
  OPTIONAL { ?item rdfs:label ?Label_en . FILTER (lang(?Label_en) = "en") }
  OPTIONAL { ?item rdfs:label ?Label_de . FILTER (lang(?Label_de) = "de") } 
  OPTIONAL { ?item rdfs:label ?Label_fr . FILTER (lang(?Label_fr) = "fr") }
  OPTIONAL { ?item rdfs:label ?Label_it . FILTER (lang(?Label_it) = "it") }
  OPTIONAL { ?item rdfs:label ?Label_es . FILTER (lang(?Label_es) = "es") }
  OPTIONAL { ?item rdfs:label ?Label_ru . FILTER (lang(?Label_ru) = "ru") }
  OPTIONAL { ?item skos:altLabel ?Alias_en . FILTER (lang(?Alias_en) = "en") }
  OPTIONAL { ?item skos:altLabel ?Alias_de . FILTER (lang(?Alias_de) = "de") } 
  OPTIONAL { ?item skos:altLabel ?Alias_fr . FILTER (lang(?Alias_fr) = "fr") }
  OPTIONAL { ?item skos:altLabel ?Alias_it . FILTER (lang(?Alias_it) = "it") }
  OPTIONAL { ?item skos:altLabel ?Alias_es . FILTER (lang(?Alias_es) = "es") }
  OPTIONAL { ?item skos:altLabel ?Alias_ru . FILTER (lang(?Alias_ru) = "ru") }
  OPTIONAL { ?item schema:description ?Description_en . FILTER (lang(?Description_en) = "en") }
  OPTIONAL { ?item schema:description ?Description_de . FILTER (lang(?Description_de) = "de") } 
  OPTIONAL { ?item schema:description ?Description_fr . FILTER (lang(?Description_fr) = "fr") }
  OPTIONAL { ?item schema:description ?Description_it . FILTER (lang(?Description_it) = "it") }
  OPTIONAL { ?item schema:description ?Description_es . FILTER (lang(?Description_es) = "es") }
  OPTIONAL { ?item schema:description ?Description_ru . FILTER (lang(?Description_ru) = "ru") }
  OPTIONAL { ?item wdt:P279 ?superClass }
  OPTIONAL { ?item wdt:P279/rdfs:label ?superClassLabel_en . FILTER (lang(?superClassLabel_en) = "en") }
}
group by ?item  						#List all the variables for which the values are not concatenated!
         ?Label_en ?Description_en 
         ?Label_de ?Description_de 
         ?Label_fr ?Description_fr 
         ?Label_it ?Description_it
         ?Label_es ?Description_es
         ?Label_ru ?Description_ru

Try it!

Let's Practice!

Querying & Editing Wikidata

Swiss heritage institutions without a “director” statement

Take the example query above as a starting point to create a query that outputs all Swiss museums without a director / manager (P1037) statement. Find the missing information for some of the listed museums on the Internet and add it to Wikidata.

Hints:

• Indicate the website where you found the information as the source of your statement.

For advanced learners:

• What other information can you add about the museum based on the information you can easily find on the Internet or in other sources you have at hand? – Take the entry on the Rijksmuseum (Q190804) as a source of inspiration for further statements to be added!
• Do the same for Swiss libraries and/or archives.

Swiss heritage institutions without a German/French label

Use the example query in the data ingest guideline to identify Swiss museums without a label in German and/or French. Search for the relevant information on the Internet and add it to Wikidata.

For advanced learners:

• Follow the guideline to download the data to a spreadsheet. Complete the labels and/or descriptions in the spreadsheet and feed them back into Wikidata using the Quick Statements tool.

Items about Swiss museums with statements that are not properly sourced

Use the query below to identify items about Swiss museums with statements that are not properly sourced. Search for an appropriate reference on the Internet and add to th the statement in question.

SELECT ?item ?itemLabel ?property ?propertyLabel ?statement
WITH {
  SELECT DISTINCT ?item WHERE {
    ?item wdt:P31/wdt:P279* wd:Q33506;
          wdt:P17 wd:Q39.
  }
} AS %items
WITH {
  SELECT ?item ?itemLabel WHERE {
    INCLUDE %items.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],de,fr,it,en". }
  }
} AS %itemLabels
WITH {
  SELECT ?item ?property ?statement WHERE {
    INCLUDE %items.
    ?property wikibase:claim ?p.
    ?item ?p ?statement.
    MINUS {
      # TODO check what counts as good reference
      ?statement prov:wasDerivedFrom [
        pr:P248|pr:P854 ?goodReference
      ].
    }
    # TODO expand list of properties that don’t need good references:
    FILTER(?p NOT IN (p:P373,  #commons category
                      p:P856,  #official website
                      p:P18,   #image
                      p:P227,   #identifier with weblink
                      p:P214,   #identifier with weblink
                      p:P269,   #identifier with weblink
                      p:P2427,  #identifier with weblink
                      p:P213,   #identifier with weblink
                      p:P4678,  #identifier with weblink
                      p:P3153,  #identifier with weblink
                      p:P902    #identifier with weblink
                      ))  
  }
} AS %statements
WITH {
  SELECT DISTINCT ?property WHERE {
    INCLUDE %statements.
  }
} AS %properties
WITH {
  SELECT ?property ?propertyLabel WHERE {
    INCLUDE %properties.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],de,fr,it,en". }
  }
} AS %propertyLabels
WHERE {
  INCLUDE %statements.
  INCLUDE %itemLabels.
  INCLUDE %propertyLabels.
}

ORDER BY ?item

Try it!

Canadian museums without a “director” statement

The example query below outputs all the Swiss museums without a director / manager (P1037) statement. Take it as a starting point to create a query that outputs all the Canadian museums without a director / manager (P1037) statement. Find the missing information for some of the listed museums on the Internet and add it to Wikidata.

SELECT DISTINCT ?item ?itemLabel
WHERE 
{
  ?item wdt:P31/wdt:P279* wd:Q33506; # museum
        wdt:P17 wd:Q39.
  MINUS { ?item wdt:P1037 [] }   # exclude if there is a "director" statement
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en,fr". }
}

Try it!

Hints:

• Indicate the website where you found the information as the source of your statement.

For advanced learners:

• What other information can you add about the museum based on the information you can easily find on the Internet or in other sources you have at hand? – Take the entry on the Rijksmuseum (Q190804) as a source of inspiration for further statements to be added!
• Do the same for Canadian libraries and/or archives.

Exploring Ontologies & Editing Wikidata

Typology of heritage institutions

Use the Wikidata Ontology Explorer to inspect the typology of museums, archives, and libraries on Wikidata. Find out which are the most used properties in connection with these classes. Click through the main classes and properties and make sure that they have appropriate labels and descriptions in your language.

Typology of concerts, recordings

Do the same as above, but for musical performance (Q6942562), for recording (Q13557414), and for voice type (Q1063547).

For advanced learners:

• Try to identify errors and gaps in the class trees and correct them.