A browser-based visual editor for OWL/RDF ontologies and heterogeneous schema mappings. Built for defense interoperability scenarios — no backend required.

Live Demo →

Rosetta lets you visually design the data integration pipeline for coalition operations where allied nations contribute sensor data from different systems — each with its own JSON/XML schema, field names, units, and language. The Semantic Web approach: define a common OWL ontology, map heterogeneous sources to it, validate with SHACL, and transform/fuse into a unified dataset.

All processing runs in the browser. Nothing is sent to a server.

• Visual OWL/RDFS ontology editor — drag-and-drop class nodes, object/data property edges, bidirectional Turtle code editor ↔ canvas sync
• Multi-source JSON/XML import — auto-generates RDFS schemas from raw data; each source gets its own canvas layer
• Visual mapping editor — drag mapping edges between source and master nodes; supports direct, template, constant, typecast, language, formula, and sparql mapping kinds
• SHACL validation — author shapes in a Turtle editor, run validation, see per-violation details with node navigation
• RML/YARRRML export — download production-ready mapping files for use in ETL pipelines (RMLmapper, Carml, etc.)
• Transform & Fuse — execute all mappings via RMLmapper-js, merge into a single RDF graph, export as JSON-LD
• IndexedDB persistence — auto-saves your project; export/import as .onto-mapper.json
• Interactive onboarding tour — guided walkthrough for first-time users
• Sample project — NATO air defense radar integration (three nations, three schemas, one ontology)

git clone https://github.com/drex04/rosetta.git
cd rosetta
npm install
npm run dev

Open http://localhost:3000.

npm run build      # outputs to dist/
npm run preview    # serve the dist/ folder locally

The output is a fully static bundle — deploy to GitHub Pages, Netlify, Vercel, or any static host.

This project is a learning tool for exploring Semantic Web technologies (OWL, RDF, SHACL, RML) in the context of a realistic NATO defense interoperability scenario. It was built to demonstrate that the full Linked Data pipeline — from raw heterogeneous schemas to a fused, validated RDF graph — can run entirely client-side.

MIT