> ## Documentation Index
> Fetch the complete documentation index at: https://docs.asclevor.com/llms.txt
> Use this file to discover all available pages before exploring further.

# The ontology: a graph model for medical knowledge

> How Asclevor models conditions, symptoms, and differentials as a directed graph with typed, weighted, and versioned relationships instead of flat lists.

Asclevor organizes medical knowledge as a **directed graph** — not a flat list of conditions.

## Structure

Every relationship carries metadata:

* **Diagnostic weight** (0.0–1.0): How strongly a symptom indicates a condition
* **Frequency**: How often patients with this condition present this symptom
* **Confidence level**: How well-validated this relationship is in our review process

## Why a Graph?

Flat medical databases (like raw ICD-10 files) only tell you what conditions exist. Asclevor tells you how they connect — which symptoms point to which conditions, how strongly, and with what clinical context.

This enables applications that reason about health data, not just display it.

## Versioning

The ontology is semantically versioned. Every data point carries provenance:

* When it was added
* What source it came from
* When it was last reviewed
* What confidence level it carries