Query dbpedia

dbpedia.js

import fetch from 'node-fetch';

let prefix = `
PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
`

const person = '<http://dbpedia.org/ontology/Person>';

function ontology(val) {
	return `?person <http://dbpedia.org/ontology/${val}> ?${val}.`;
}

let query = `SELECT * WHERE {
	?person a ${person} .
	${ontology('nationality')}
	${ontology('birthDate')}
	${ontology('birthPlace')}
	${ontology('deathDate')}
	${ontology('deathPlace')}
	${ontology('almaMater')}
	${ontology('influenced')}
	?influenced a ${person}.
}`

function getUrl(prefix, query, limit = 500) {
  const baseurl = 'http://dbpedia.org';
  const urlpath = '/sparql';
  const params = {
  	'default-graph-uri': 'http://dbpedia.org',
    query: encodeURIComponent([prefix, query, `LIMIT ${limit}`].join(' ')),
    output: 'json'
  };

  const paramString = Object.keys(params).map(x => `${x}=${params[x]}`).join('&'); // <3
  return `${baseurl}${urlpath}?${paramString}`;
}

fetch(getUrl(prefix, query))
.then(response => response.json())
.then(json => json.results)
.then(results => results.bindings)
.then(bindings => console.log(JSON.stringify(bindings, null, '  ')));

babel dbpedia.js | node