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Oct 9, 2026 · Fundamentals

Palantir Ontology Modeling: 4 Core Principles for Scalable Domain Design

This article breaks down Palantir's four prioritized ontology modeling principles—domain-driven design, DRY with Rule of Three, open/closed extension, and composition over inheritance—illustrating each with concrete anti-patterns and a practical 12-question review checklist to prevent model fragmentation as teams scale.