protege_pizza

🍕 Executable Knowledge Architecture (EKA)

Mastering Ontology Engineering with Protégé and Pizza.owl

From Pizza.owl to Executable Intelligence

💡 Looking for the complete, professional guide? While this repository provides open-source snapshot code (the individual “pieces”), our structured multi-volume eBook series on Leanpub and Amazon Kindle provides the complete architectural framework, deep-dive explanations, and advanced engineering practices (such as Stage 4 Semantic Governance).

👉 Get the Full eBook on Leanpub or Get it on Amazon Kindle to support this project!

🏛 What is EKA?

EKA stands for:

Executable Knowledge Architecture

EKA is a practical framework for transforming human knowledge into machine-readable, machine-reasonable, and ultimately machine-executable intelligence.

The framework is represented as:

EKA = (K, R, Θ, Φ, Γ)

K = Knowledge
R = Reasoning & Rules
Θ = Triggers
Φ = Actions / Execution
Γ = Governance

EKA provides an architectural bridge between:

Ontology Engineering
Knowledge Graphs
Semantic Governance
AI Systems
Agent Architectures
Executable Intelligence

🌍 The EKA Journey

This project began as an exploration of the legendary Pizza.owl tutorial created by Michael DeBellis and the Protégé community.

Over time it evolved into a broader engineering journey:

Pizza.owl
↓
Ontology Engineering
↓
Knowledge Graphs
↓
Semantic Governance
↓
Reasoning
↓
AI-Ready Systems
↓
Executable Intelligence

The Pizza tutorial remains the educational foundation.

EKA is the destination.

🚀 Project Vision

This repository is the official engineering environment for the Executable Knowledge Architecture (EKA) initiative.

The objective is not simply to learn OWL or Protégé.

The objective is to learn how knowledge itself can become:

Structured
Governed
Reused
Reasoned
Automated
Executable

Through the EKA series you will gradually move from ontology fundamentals toward enterprise-scale knowledge architecture and intelligent systems.

🌟 Why Learn Ontology & Protégé?

In the era of AI and Large Language Models (LLMs), ontologies provide the formal semantic layer that machines need to reason reliably.

By following this repository and companion eBook series, you will learn how to:

Build ontologies using Protégé
Model domains semantically
Design reusable ontologies
Apply reasoning and inference
Govern semantic knowledge
Build knowledge graphs
Prepare AI-ready semantic systems
Understand executable knowledge architecture

cover

📚 Companion eBook Series

Executable Knowledge Architecture (EKA)

Mastering Ontology Engineering with Protégé and Pizza.owl

Volume 1 — Semantic Foundations

Learning Ontology Engineering through Protégé and Pizza.owl

Chapters 00-08

Introduces ontology engineering fundamentals, Protégé, RDF foundations, class hierarchies, semantic thinking, reasoning, and the EKA framework.

Volume 2 — Semantic Relationships

Mastering Object Properties and Ontology Structures

Chapters 09-13

Introduces object properties, inverse properties, property characteristics, domain, range, and semantic relationship design.

Volume 3 — Semantic Logic

OWL Restrictions, Reasoning and Governance

Chapters 14-16

Explores existential restrictions, universal restrictions, reasoning foundations, semantic requirements, and governance concepts.

Volume 4 — Semantic Knowledge Engineering

The Semantic Knowledge Development Lifecycle (SKDL)

Chapters 17-24

Introduces ontology engineering as a disciplined engineering process through the Semantic Knowledge Development Lifecycle.

Volume 5 — Knowledge Graph Engineering

Transforming Ontologies into Connected Intelligence

Chapters 25-30

Focuses on transforming ontologies into operational knowledge graphs and connected semantic systems.

Volume 6 — AI-Ready Semantic Systems

Knowledge Graphs, Agents and Intelligent Retrieval

Chapters 31-36

Connects ontologies, knowledge graphs, reasoning, retrieval, and agent-based architectures.

Volume 7 — Executable Intelligence

Realizing the Vision of Executable Knowledge Architecture

Chapters 37-42

Completes the transformation from semantic knowledge into executable intelligence systems.

👉 Read the Source Code & Markdown Files Directly

All raw chapters remain open-source and available under CC BY-NC-SA 4.0.

Read book source: /ebook/markdown/

🎓 Learning Path

This repository is a companion to the complete video series.

Recommended sequence:

Videos
↓
Repository Snapshots
↓
Markdown Chapters
↓
Companion eBooks
↓
Knowledge Graph Projects
↓
Executable Knowledge Architecture

🙏 Intellectual Heritage

This work stands on the shoulders of giants.

Special recognition goes to:

Matthew Horridge
Holger Knublauch
Alan Rector
Robert Stevens
Chris Wroe
Simon Jupp
Georgina Moulton
Nick Drummond
Sebastian Brandt

and particularly:

Michael DeBellis

whose Pizza.owl tutorial remains one of the most influential practical introductions to ontology engineering ever created.

We are also honored to feature technical review and forewords from:

Timothy W. Cook Founder of SDC (Semantic Data Charter)

❤️ Final Thought

The journey begins with pizza.

But the real subject is meaning.

— Michael DeBellis

And in EKA:

The journey begins with Pizza.owl.

The destination is Executable Intelligence.

— EKA Project

Last updated at 2026-09-11

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