The specification defines three knowledge types for extraction: axiomatic facts are stable architectural truths, empirical knowledge is derived from implementation conclusions, and prescribed knowledge captures design decisions and standards so that extracted CXUs are categorized by source and certainty.

**Knowledge types:**

— PYRANA_Internal_Knowledge_Graph_Specification.md

`axiom` — Architectural facts that are stable (e.g., "PYRANA uses Temporal for workflow orchestration")

— PYRANA_Internal_Knowledge_Graph_Specification.md

`derived` — Conclusions drawn from implementation (e.g., "The 3-strategy KAG retrieval pipeline provides fallback resilience when template queries return no results")

— PYRANA_Internal_Knowledge_Graph_Specification.md

`prescribed` — Design decisions and standards (e.g., "All tools must use the @tool() decorator with appropriate flags")

— PYRANA_Internal_Knowledge_Graph_Specification.md