Linked Open Data

Snorql -- Published a Browser UI for Easily Exploring Multiple SPARQL Endpoints

Snorql — A Browser-Based UI for Exploring Multiple SPARQL Endpoints https://nakamura196.github.io/snorql/ Introduction Have you ever wanted a quick, easy way to try out SPARQL endpoints? SPARQL is the standard query language for searching Linked Open Data (LOD), but each endpoint often has a different UI — or none at all. To solve this, I published Snorql, a tool that lets you switch between multiple endpoints from a single, unified UI. ...

February 8, 2026 · Updated: February 8, 2026 · 4 min · Nakamura

Odeuropa Visualization: A Platform for Visualizing Scent Data Using SKOS Vocabularies and SPARQL

Introduction Odeuropa is a project that studies the history of scents in Europe, collecting and analyzing representations of scents depicted in paintings, literature, and other historical sources. This article introduces the implementation of a web application for visualizing scent data based on the SKOS (Simple Knowledge Organization System) vocabulary, utilizing Odeuropa’s SPARQL endpoint. https://odeuropa-seven.vercel.app/ja/ Project Overview Technology Stack Frontend: Next.js 15 (App Router) UI: Material-UI v5 Internationalization: next-intl Data Retrieval: SPARQL queries (Odeuropa SPARQL endpoint) Language: TypeScript Hosting: Static Site Generation (SSG) Main Features 1. Scent Search (/odeuropa-sources) This is the core feature of the application, allowing users to search and browse smell perception events collected by the Odeuropa project. ...

October 24, 2025 · Updated: October 24, 2025 · 7 min · Nakamura

Using the "Tale of Genji in Textbooks LOD"

Overview This is a memo about trying out the “Tale of Genji in Textbooks LOD” (Kyokasho no Naka no Genji Monogatari LOD). https://linkdata.org/work/rdf1s10294i It is described as follows. The “Tale of Genji in Textbooks LOD” is an LOD conversion of data on The Tale of Genji published in post-war authorized textbooks for the classical literature section of high schools. I would like to thank all those involved in creating and publishing the “Tale of Genji in Textbooks LOD”. ...

December 15, 2024 · Updated: December 15, 2024 · 3 min · Nakamura

Obtaining Persistent Identifiers with w3id.org and Redirecting to Snorql

Overview I created the following page for publishing RDF data. https://sukilam-educational-metadata.github.io/ In particular, from the following page, you can search RDF data using SPARQL and Snorql. For Snorql, I am using “Snorql for Japan Search”. Please try the query examples at the bottom of the page. https://sukilam-educational-metadata.github.io/snorql/ When publishing this page, I obtained persistent identifiers using w3id.org and set up redirects to Snorql, so this is a personal note for future reference. ...

April 2, 2023 · Updated: April 2, 2023 · 2 min · Nakamura

Example of Running SPARQL Queries Against the Japan Search RDF Store Using Google Colab

I created a notebook demonstrating examples of running SPARQL queries against the Japan Search RDF store using Google Colab. I hope it serves as a useful reference when using RDF stores with Python. https://colab.research.google.com/github/nakamura196/ndl_ocr/blob/main/ジャパンサーチのRDFストアを対象したSPARQLチュートリアル.ipynb Other reference sites and tutorials include the following. https://www.kanzaki.com/works/ld/jpsearch/ https://lab.ndl.go.jp/data_set/tutorial/

April 29, 2022 · Updated: April 29, 2022 · 1 min · Nakamura