WebAssembly API Reference¶

Browser bindings via @ontologos/wasm. Published on npm; .wasm also on Wasmer — see Bindings overview and WASM guide.

Tutorial: WASM guide.

Install¶

npm install @ontologos/wasm

Channel	Link
npm	`@ontologos/wasm`
Wasmer	wasmer.io/eddiethedean/ontologos
Source	Build `crates/ontologos-wasm`

Build¶

cd crates/ontologos-wasm
npm install && npm run build   # wasm-pack --target web

Requires wasm-pack and Rust wasm32-unknown-unknown target.

Profiles¶

Same strings as Python: "auto", "rdfs", "rl", "el", "dl", "swrl", "alc", "dl-preview". DL builds produce large .wasm files (multi‑MB).

Initialization¶

import init, { Reasoner, OntologyBuilder } from "@ontologos/wasm";
await init({ module_or_path: wasmUrl });

`Reasoner`¶

Constructor	Description
`new Reasoner(ontology, profile)`	In-memory only (no filesystem)
`new Reasoner(ontology, profile, incremental, budgetSecs)`	Full config

No file-path constructors — WASM has no filesystem API.

Methods¶

Method	Returns	Description
`classify()`	Object	Taxonomy or materialization report
`checkConsistency()`	Object	`{ consistent, complete }`
`isConsistent()`	`boolean`	Throws `IncompleteReasoningError` when incomplete
`explain()`	Object	Proof graph
`addSubclassOf(sub, sup)`	`void`	Incremental mutation

`Ontology`¶

Method	Description
`fromBytes(Uint8Array)`	Strict OWL/RDF parse
`fromBytesLenient(Uint8Array)`	Trusted corpora only
`fromText(string)` / `fromTextLenient(string)`	Text parse
`fromJson(json)` / `fromJsonWithLimits(json, maxBytes)`	JSON snapshot
`fromObject(obj)` / `fromObjectWithLimits(obj, …)`	Parsed JSON object

Recommended browser upload caps: 1–4 MiB unless you control memory budgets.

Errors¶

Throws Error subclasses with .name / .code: ParseError, ResourceLimitError, IncompleteReasoningError.

Python API — canonical parity reference
Security — WASM