OntoLogos

Native Rust ontology reasoning: load OWL files, detect profiles, run RDFS materialization and OWL RL saturation.

Status: v0.5 — OWL EL taxonomy classification, OWL RL saturation, and RDFS materialization. Not full OWL DL / HermiT replacement.

5-minute try: Getting started · API: docs.rs/ontologos-core

Partial OWL mapping: axiom_count() reflects mapped axioms, not Protégé's total. See Supported constructs.

Install

Requires Rust 1.88+.

[dependencies]
ontologos-core = "0.5.0"
ontologos-parser = "0.5.0"
ontologos-profile = "0.5.0"
ontologos-rdfs = "0.5.0"
ontologos-rl = "0.5.0"
ontologos-el = "0.5.0"
ontologos-query = "0.5.0"

Python (alpha): pip install ontologos — pass profile="rdfs", "rl", "el", or "auto" (Python guide).

Quick start (crates.io)

No repository clone required — use any OWL file on disk:

cargo new ontologos-demo && cd ontologos-demo

Cargo.toml:

[package]
name = "ontologos-demo"
version = "0.1.0"
edition = "2021"

[dependencies]
ontologos-core = "0.5.0"
ontologos-parser = "0.5.0"
ontologos-rdfs = "0.5.0"

src/main.rs:

use ontologos_parser::load_ontology;
use ontologos_rdfs::RdfsEngine;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let path = std::path::Path::new("ontology.owl"); // your file here
    let mut ontology = load_ontology(path)?;

    let report = RdfsEngine::new().materialize(&mut ontology)?;
    println!(
        "mapped {} → {} axioms (inferred {})",
        report.initial_axiom_count,
        report.final_axiom_count,
        report.inferred_total()
    );
    Ok(())
}

cargo run

OWL RL saturation, profile detection, and CLI examples: documentation site.

Quick start (repository clone)

For CLI, benchmarks, and full test suite:

git clone https://github.com/eddiethedean/ontologos.git
cd ontologos
./benchmarks/scripts/download.sh   # Pizza corpus; Family is vendored
cargo run -p ontologos-core --example pizza_builder
cargo build -p ontologos-cli --release
./target/release/ontologos materialize benchmarks/data/family.owl

CLI: classify --profile auto routes to EL or RL; use materialize for explicit RDFS. See CLI reference.

Workspace

Full feature matrix and roadmap: documentation index · ROADMAP

Documentation

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.