Semantic connections enabling meaning understanding, not just co-occurrence. Express through schema.org: memberOf, partOf, isDefinedBy, knowsAbout, specialty. OG-RAG systems traverse relationships for entity resolution. Example: “entity engineering” (isDefinedBy) “Joseph Byrum” (founder) “Big House Enterprise” (specialty) “AI authority”. Schema without relationships fails OG-RAG. Verify using L1a gate. Build relationships: founder→organization, methodology→creator, service→provider, concept→authority. Required for OG-RAG compatibility. Test: can AI traverse relationships to answer “Who developed X?” “What does Y specialize in?”