The knowledge_type field in a CXU is defined to use the values axiom, derived, or prescribed so that each unit is categorized by the nature of the knowledge it contains.

knowledge_type: axiom|derived|prescribed

— PYRANA_Internal_Knowledge_Graph_Specification.md

### 5.2 Knowledge Type Guidelines

— PYRANA_Internal_Knowledge_Graph_Specification.md

| Knowledge Type | When to Use | Approval Workflow | Examples |

— PYRANA_Internal_Knowledge_Graph_Specification.md

| `axiom` | Stable facts that rarely change |

— PYRANA_Internal_Knowledge_Graph_Specification.md

| `derived` | Conclusions drawn from data/experience |

— PYRANA_Internal_Knowledge_Graph_Specification.md

| `prescribed` | Standards, policies, approved language |

— PYRANA_Internal_Knowledge_Graph_Specification.md