OntoLogos documentation

v1.1.4 Rust 1.88+ Python · Rust · npm · Wasmer

OntoLogos documentation

Embed OWL reasoning in your stack

Load OWL files, detect profiles, and classify or materialize in-process — no JVM. Rust and Python on crates.io/PyPI; Node and WASM on npm (WASM also on Wasmer); Java, .NET, and C/C++ via source build.

Try in 5 minutes → Python quickstart Bindings overview

Install channels · Release status · Before you integrate · Start here

Pick the path that matches how you work:

• Rust (crates.io)

  ---

  Download family.owl, add ontologos-core, ontologos-parser, and ontologos-rl, run RDFS materialization—no clone required.

  Five-minute guide

• Python

  ---

  pip install ontologos — load OWL, classify with profile="auto", incremental mutations.

  Python guide

• Node.js (npm)

  ---

  npm install ontologos — native N-API bindings (macOS, Linux, Windows).

  Node.js guide

• WebAssembly

  ---

  npm install @ontologos/wasm · Wasmer eddiethedean/ontologos.

  WASM guide

• CLI (git install)

  ---

  classify, materialize, explain — install from git (not crates.io).

  CLI installation

• Evaluate

  ---

  Compare vs ELK, reasonable, and HermiT fixtures; 30-minute playbook. No Rust required: pip install ontologos + family.owl.

  Evaluator playbook

No clone required for most users

Use crates.io, PyPI, npm, or Wasmer. Clone to contribute, run benchmarks, build Java/.NET/C bindings, or build the CLI.

Rust 1.88+ for library users — see the Prerequisites decision table.

Before you integrate

Read Before you integrate — partial OWL mapping, import limits, and axiom count semantics.

Rust integrators

See the Rust integration contract — one page for load, classify, and consistency rules.

Preview profiles

alc and dl-preview are experimental. Production OWL DL uses profile="dl". See Profile stability.

What you need

Channel	Link
Docs	ontologos.readthedocs.io
crates.io	ontologos-core and siblings
PyPI	pip install ontologos
npm	ontologos · @ontologos/wasm
Wasmer	eddiethedean/ontologos
Rust API	docs.rs/ontologos-core
Changelog	project/changelog · GitHub

Documentation map

Area	Start here
New users	Before you integrate · Install channels · Start here
Examples	Examples gallery
API choice	Choosing an API · Profile stability
Evaluate	Evaluator playbook · Evaluator scope · Comparison
Upgrade	Migration hub · Release status

Learning path

New to OWL? Start with the Glossary and When not to use OntoLogos, then Python guide or Rust quickstart.

Know OWL already:

1. Before you integrate
2. Getting started — crates.io quick start
3. Classify in five minutes
4. Load an OWL file
5. Profile guides: RDFS · RL · EL · SWRL
6. Profile detection
7. Error reference

Capability matrix (v1.1.4)

Capability	Library	CLI	Python
Load OWL files	Yes	Yes	Yes
Profile detection	Yes	profile	"auto"
RDFS materialization	Yes	materialize	profile="rdfs"
OWL RL saturation	Yes	classify --profile rl	profile="rl"
OWL EL taxonomy	Yes	classify --profile el	profile="el"
OWL DL	Yes	classify --profile dl	profile="dl"
SWRL	Yes	classify --profile swrl	profile="swrl"
Incremental reasoning	Yes	--incremental	incremental=True
Explanations	Yes	explain	explain()
Taxonomy DataFrame export	No	No	Yes (pandas/polars)