Hybrid Knowledge Graph Bridge

Integration pattern for linking structured domain data to LLM-extracted lexical graphs

Problem

When building Knowledge Graphs from heterogeneous sources, two distinct graph types often need coexistence:

1. Domain Graph — Structured, curated data from CSV/databases representing business entities and relationships
2. Lexical Graph — Entities and relationships automatically extracted from unstructured documents via LLM

These graphs speak different languages: one is schema-driven and deterministic, the other is probabilistic and emergent. Without a deliberate bridge, they remain disconnected silos.

Solution

The solution establishes a reliable join key between both graphs through five steps.

Step 1: Specify the lexical graph schema