# Phase 5 Plan: Ontology and Learning Materials

**Status:** Ready for execution
**Phase Goal:** Ingest learning materials into source-backed ontology candidates.

## Requirements Covered

- ONTO-01: User or operator can upload learning materials.
- ONTO-02: System creates source-backed ontology candidate nodes and edges.
- ONTO-03: System detects missing prerequisites and weakly supported concepts.
- ONTO-04: Generated or inferred content is marked as candidate until reviewed.

## Tasks

### 1. Add ontology package

- Define material, concept candidate, edge candidate, gap, and snapshot types.
- Add in-memory store and service.

### 2. Implement deterministic MVP analyzer

- Extract known backend interview concept candidates from material text.
- Create prerequisite edges for supported concept pairs.
- Create gap candidates for missing prerequisites and weak evidence.

### 3. Add HTTP endpoints

- `POST /api/v1/materials`
- `GET /api/v1/ontology`

### 4. Add tests and verification

- Test material ingestion creates source-backed candidates.
- Test gaps are candidate-only.
- Test HTTP ingestion and ontology snapshot flow.
- Run Go tests, OpenSpec validation, line-count check, and smoke.

## Out of Scope

- Multipart upload.
- Real document parsers.
- Human review promotion.