Wikidata

Wikidata Query Service: Exploring Knowledge Graphs with SPARQL

Introduction In Digital Humanities research, structured data is an extremely valuable resource. When information about people, places, works, and events is organized in a machine-readable format, large-scale data analysis and cross-dataset integration become possible. Wikidata is a free knowledge base operated by the Wikimedia Foundation, containing over 100 million items. The Wikidata Query Service is a free web service that allows you to execute SPARQL queries against this database and visualize results in various formats. ...

March 15, 2026 · 4 min · Nakamura

Retrieving RDF from URIs Using Content Negotiation in Python

Overview I had an opportunity to retrieve RDF data from Wikidata entity URIs, so here are my notes. Without Content Negotiation First, make a request with empty headers as follows. import requests # URL for the Wikidata entity in RDF format url = "http://www.wikidata.org/entity/Q12418" headers = { } # Sending a GET request to the URL response = requests.get(url, headers=headers) # Checking if the request was successful if response.status_code == 200: text = response.text print(text[:5000]) else: print("Failed to retrieve RDF data. Status code:", response.status_code) In this case, you can retrieve text data in JSON format as follows. ...

June 23, 2024 · Updated: June 23, 2024 · 2 min · Nakamura

Trying Parts of https://wikidata.reconci.link/

Overview During my research, I learned about the existence of the following API. https://wikidata.reconci.link/ This is a memo on how to use it. Suggest Suggest values could be obtained using URLs like the following. https://wikidata.reconci.link/en/suggest/entity?prefix=中村覚 Preview Preview results could be obtained using URLs like the following. https://wikidata.reconci.link/en/preview?id=Q107095935 Summary It appears to be commonly used together with OpenRefine, and I would like to investigate further when the opportunity arises. https://qiita.com/yayamamo/items/eade3e5788e6f359bce7

June 17, 2024 · Updated: June 17, 2024 · 1 min · Nakamura

Trying cwrc's wikidata-entity-lookup

Overview This is a continuation of the following article. One of the features of LEAF-WRITER is described as follows: the ability to look up and select identifiers for named entity tags (persons, organizations, places, or titles) from the following Linked Open Data authorities: DBPedia, Geonames, Getty, LGPN, VIAF, and Wikidata. This feature uses libraries such as the following. https://github.com/cwrc/wikidata-entity-lookup I tried out this feature. Usage npm packages are published at the following locations. ...

May 16, 2024 · Updated: May 16, 2024 · 1 min · Nakamura

Trying QuickStatements on wikibase.cloud

Overview I tried QuickStatements on wikibase.cloud, so here are my notes. I referred to the following article. https://qiita.com/higa4/items/10affb47215def42d8e0 Adding Data Following the article above, I imported a CSV file. However, the following error occurred. The cause was that the required properties were not registered on the independently set up wikibase instance. Property [[Property:P1814|P1814]] not found It turned out that properties (especially those with the same IDs as wikidata) need to be registered in advance using WikibaseSync or similar tools. ...

July 19, 2023 · Updated: July 19, 2023 · 1 min · Nakamura

Trying Out WikibaseSync

Overview I had the opportunity to try out the following WikibaseSync, so this is a personal note for future reference. https://github.com/the-qa-company/WikibaseSync I learned about this tool from the following paper. https://doi.org/10.11517/jsaisigtwo.2022.SWO-056_04 Installation Install the source code and related libraries. !get clone https://github.com/the-qa-company/WikibaseSync cd WikibaseSync !pip install -r requirements.txt Creating a Bot Account Access the Wikibase prepared in advance, and click “Bot passwords” from “Special pages”. On the following screen, enter the “Bot name”. ...

July 19, 2023 · Updated: July 19, 2023 · 2 min · Nakamura

Retrieving Birth and Death Years of Historical Figures from Wikidata

I created a notebook for retrieving birth and death years of historical figures from Wikidata. I hope this serves as a helpful reference. https://colab.research.google.com/github/nakamura196/ndl_ocr/blob/main/Wikidataから人物の生没年を取得する.ipynb

October 27, 2022 · Updated: October 27, 2022 · 1 min · Nakamura