The DERIVED_FROM edge in the Neo4j schema links one CxU to another CxU as lineage so that derivation relationships between context units can be tracked.

DERIVED_FROM: CxU → CxU (lineage)

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

**Key edges:**

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

CxU → CxU (lineage)

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md