Semantic Layers, Ontologies, and Metrics in Simple Words

The big context words, explained without the jargon.

What this chapter covers

Semantic layer. Ontology. Metric store. Knowledge graph. The words are heavy but the ideas are not. This chapter explains each one in plain English, shows how they overlap, and gives you a way to pick which one your team actually needs first.

Key takeaways

Plain-English definitions for semantic layer, ontology, metric store, and knowledge graph
How these concepts overlap — and where they genuinely differ
Which one to build first depending on your data maturity
How each maps to what an agent actually reads at runtime
The vocabulary you need to have a productive meeting with any vendor

Why it matters

You cannot buy or build what you cannot name. This chapter gives you the shared language your data, AI, and business teams have been missing.

Read the full chapter — unlock the book

The Context Advantage is a living guide for the agentic era. Chapters 1 – 3 are free. Everything else, plus future updates, templates, and resources, is included with the lifetime edition.

Unlock The Context Advantage — $59

Already bought it on another browser? Open it here

Browse the full table of contents, or explore the four pillars — Context, Control, Cost, and Choice.