Very brief overview of tool development in Wikidata and an example of an external tool and a gadget in Wikidata: COOL-WD. Presented @ Wikidata Zurich, 14 September 2017

1. Developing Tools for Wikidata
Mini Hands-On Session
Radityo Eko Prasojo, UNIBZ

2. Wikidata Tools
• External tools
• Tools that run independently outside Wikidata
• More freedom
• User scripts
• Tools that run natively in Wikidata
• More restrictive
• Gadgets
• Stable user scripts maintained by Wikidata administrators

3. A Wikidata tool typically…
Consume Analyze Enhance
[information from Wikidata] [into valuable insights] [user experience]

4. Example: Wikidata Completeness
Problem: Wikidata has no way of storing that data is complete

5. Cantons of Switzerland in Wikidata

6. All Cantons by Swiss Constitution

7. Wikidata is complete for
Cantons of Switzerland!

8. Completeness Statements1
• Syntax: (s,p)
• Semantics: Wikidata has a complete statement (s,p)
Wikidata has complete information about p of s
• Example: Wikidata has completeness statement (Q39, P150)
Wikidata has complete information about administrative
divisions/cantons (P150) of Switzerland (Q39)
1Darari et al. Enabling Fine-Grained RDF Data Completeness Assessment. ICWE 2016.

9. We have developed
a completeness management tool for Wikidata
The management feature comprises:
• browsing Wikidata entities enriched with completeness statements
• adding and removing completeness statements
• updating completeness provenance

10. Demo
• External tool: http://cool-wd.inf.unibz.it/
• User script: go to your common.js and add the following line:
• importScript( 'User:Fadirra/coolwd.js' );

11. Architecture
SPARQL Endpoint MediaWiki API
COOL-WD
Engine
COOL-WD
User Interface
HTTP RequestData access Web browsing
SPARQL Queries API Calls
SP-Statements DB

12. Guided tutorial: how we build COOL-WD
• Execute SPARQL query on Wikidata SPARQL endpoint and parse the
result using Java.
• Use MediaWiki API to retrieve Wikidata entity details in Java.
• Retrieve Completeness Information via HTTP request from the script.
• Modify Wikidata entity page using user script.