Open community to develop schemas and tools to link object oriented programming with linked data & the semantic web.

OO-LD (Object-Oriented Linked Data) is a unified framework that combines JSON Schema and JSON-LD to enable object-oriented linked data modeling without reinventing the wheel. By embedding JSON-LD contexts within JSON Schema documents, OO-LD allows for the simultaneous definition of data structure and semantics in a single source.

• Standards-Based: Strictly adheres to W3C standards (JSON-LD 1.1, JSON-SCHEMA 2020-12) - no new language to learn
• Tool Compatibility: Works with all existing JSON-SCHEMA and JSON-LD tooling
• Web-Native: Schemas follow linked data principles, making them retrievable over the web for flexible composition
• Multi-Purpose: Use the same schema for validation, RDF generation, code generation, UI generation, and API definitions
• Developer-Friendly: Compatible with LLM APIs, OpenAPI, and modern development workflows

Here's a minimal OO-LD schema (Person.schema.json):

{
  "@context": {
    "schema": "http://schema.org/",
    "name": "schema:name"
  },
  "$id": "Person.schema.json",
  "title": "Person",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "First and Last name"
    }
  }
}

This file is simultaneously a JSON Schema (defines structure) and a JSON-LD context (provides semantics). Notice how @context maps the name property to schema:name, enabling both validation and RDF generation from the same source.

Try it yourself:

• UI and RDF generation: OO-LD Playground - Interactive examples with UI and RDF generation
• Code and RDF generation: Python Playground - Advanced examples with code generation
• Full Tutorial - Step-by-step guide with working examples

• Research Data Management: OpenSemanticLab uses OO-LD for LIMS, ELN, and knowledge bases
• API Development: Generate OpenAPI specs with embedded semantic contexts
• LLM Integration: Use schemas directly for structured LLM output

• OO-LD Specification - Complete schema specification and examples

• oold-python - Python code generator and utilities
• Playground (YAML) - Interactive UI and RDF generation
• Playground (Python) - Try code generation online
• AWL Schema - Semantic workflow descriptions

• OpenSemanticLab - Research data management framework
• OpenSemanticWorld-Packages - Schema repository
• OpenSemanticWorld - Schema registry

• Battery Knowledge Graph - Scientific metadata using OO-LD
• OSW Chatbot - LLM integration examples

• Report Issues

Start exploring: Try the interactive playground or check out the specification.