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rdflib.js RDF API Example
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/** | |
* rdflib.js with node.js -- basic RDF API example. | |
* @author ckristo | |
*/ | |
var fs = require('fs'); | |
var $rdf = require('rdflib'); | |
FOAF = $rdf.Namespace('http://xmlns.com/foaf/0.1/'); | |
XSD = $rdf.Namespace('http://www.w3.org/2001/XMLSchema#'); | |
// - create an empty store | |
var kb = new $rdf.IndexedFormula(); | |
// - load RDF file | |
fs.readFile('foaf.rdf', function (err, data) { | |
if (err) { /* error handling */ } | |
// NOTE: to get rdflib.js' RDF/XML parser to work with node.js, | |
// see https://github.com/linkeddata/rdflib.js/issues/47 | |
// - parse RDF/XML file | |
$rdf.parse(data.toString(), kb, 'foaf.rdf', 'application/rdf+xml', function(err, kb) { | |
if (err) { /* error handling */ } | |
var me = kb.sym('http://kindl.io/christoph/foaf.rdf#me'); | |
// - add new properties | |
kb.add(me, FOAF('mbox'), kb.sym('mailto:e0828633@student.tuwien.ac.at')); | |
kb.add(me, FOAF('nick'), 'ckristo'); | |
// - alter existing statement | |
kb.removeMany(me, FOAF('age')); | |
kb.add(me, FOAF('age'), kb.literal(25, null, XSD('integer'))); | |
// - find some existing statements and iterate over them | |
var statements = kb.statementsMatching(me, FOAF('mbox')); | |
statements.forEach(function(statement) { | |
console.log(statement.object.uri); | |
}); | |
// - delete some statements | |
kb.removeMany(me, FOAF('mbox')); | |
// - print modified RDF document | |
$rdf.serialize(undefined, kb, undefined, 'application/rdf+xml', function(err, str) { | |
console.log(str); | |
}); | |
}); | |
}); |
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