n3

Node-n3 is a Notation3 and RDF library for node.js.

Notation3 or N3 is a superset of RDF, the Semantic Web language. This library will provide a high-performance N3 store, parser, and generator (when finished).

Currently implemented:

• high-performance N3 store
• streaming Turtle parser

Bringing reasoning to the Web is the initiative with several open source projects (such as this one) that make N3 reasoning accessible.

Use the node-n3 library.

Installation

You can install the n3 library as an npm package.

$ npm install n3

Storing and finding items

In this example below, we create a new store and add the triples :Pluto a :Dog. and :Mickey a :Mouse. Then, we find a triple with :Mickey as subject.

var n3 = require('n3');

var store = new n3.Store();
store.add(':Pluto', 'a', ':Dog');
store.add(':Mickey', 'a', ':Mouse');

var mickey = store.find(':Mickey', null, null)[0];
console.log(mickey.subject, mickey.predicate, mickey.object, '.');
// :Mickey a :Mouse .

Parsing Turtle

The node-n3 library features a streaming Turtle parser, processing Turtle documents as they grow.

var parser = new n3.Parser();
parser.parse('@prefix c: <http://example.org/cartoons#>.\n' +
             'c:Tom a c:Cat.\n' +
             'c:Jerry a c:Mouse;\n' +
             '        c:smarterThan c:Tom.',
             function (error, triple) {
               if (triple)
                 console.log(triple.subject, triple.predicate, triple.object, '.');
               else
                 console.log("# That's it, folks!")
             });

Learn more.

The Bringing reasoning to the Web page explains the origins of this project and provides pointers to related resources.