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Convention-based Ontology Generation System

(Windows) Windows Build status (Linux) Linux Build status NuGet version (cogs) DOI

The Convention-based Ontology Generation System (COGS) gives you a powerful, patterns-based way to build ontologies that enables a clean separation of concerns and gives you full control over markup for enjoyable, agile development. COGS includes many features that enable fast, Test Driven Development for publishing sophisticated models in a variety of formats.

COGS is for domain experts and groups who value ease of collaboration and low technical barriers for participation.

Highlighted projects using COGS

Output Formats

Publishable formats include:

  • XML Schema
  • OWL 2 (RDF Schema)
  • OMG's UML Normative XMI 2.4.2
  • OMG's UML XMI 2.5 with Diagrams and Diagram Exchange
  • Sphinx HTML documentation and visualizations
  • JSON Schema
  • C# class library with JSON and XML serialization
  • SVG and dot visualizations
  • GraphQL schema language

Upcoming formats include:

  • Class libraries for other languages


COGS runs on Windows, Linux, and macOS on the .NET Core 2.1 platform.


Quick starts, Modelers Guide, and technical documentation is available.

Installation and download

COGS can be installed as a dotnet global tool from nuget

dotnet tool install -g cogs

Development versions can be installed from the appveyor nuget feed

dotnet tool install -g --add-source cogs

Outputs Diagram

cogs output formats

Legal and Licensing

COGS is licensed under the MIT license.