Mentor RDF API

A TypeScript library for working with RDF vocabularies in Node.js and browsers. It powers the Mentor VS Code extension, providing structured access to ontologies through a repository pattern and lightweight structural reasoning.

Features

Repository Pattern

Access RDF resources through specialized repositories that provide type-safe, SPARQL-free querying:

• VocabularyRepository – Query ontologies and SKOS concept schemes
• ClassRepository – Retrieve OWL/RDFS classes with hierarchy traversal
• PropertyRepository – Access object, datatype, and annotation properties
• IndividualRepository – Query class instances and their properties
• ShapeRepository – Work with SHACL node and property shapes

Structural Reasoning

Built-in reasoners expand your RDF graphs with inferred triples:

• RdfsReasoner – rdfs:subClassOf, rdfs:subPropertyOf, domain/range inference
• OwlReasoner – OWL class expressions, property characteristics, equivalences
• SkosReasoner – SKOS concept hierarchies and semantic relations
• ShaclReasoner – SHACL shape target inference

RDF Store

An RDF.js-compatible triple store with:

• Multiple format support: Turtle, N3, N-Triples, N-Quads, TriG, RDF/XML
• Named graph management
• Bundled W3C ontologies (RDF, RDFS, OWL, SKOS, SHACL, XSD)

Installation

Works in Node.js (>=22) and modern browsers:

npm install @faubulous/mentor-rdf

Quick Start

import { Store, VocabularyRepository, OwlReasoner } from '@faubulous/mentor-rdf';

const graph = 'http://example.org/test';

// Create a store with OWL reasoning
const store = new Store(new OwlReasoner());

// Load an ontology
await store.loadFromTurtleStream(turtleData, graph);

// Query using repositories
const repository = new VocabularyRepository(store);

// Get all classes defined in the ontology
for (const classUri of repository.getClasses(graph)) {
  console.log(classUri);
}

// Get class hierarchy (includes inferred subclass relationships)
const subClasses = repository.getSubClasses(graph, 'http://example.org/MyClass');