RoXi

RoXi provides a uniform framework for Reactive Reasoning applications including:

• Incremental maintenance
• RDF Stream Processing
• Temporal Reasoning (TODO)

RoXi uses some of the internals of oxigraph, including sparqlalgebra and OxRDF.

RoXi can be included as a library, run in server mode through CLI or in the browser using web assembly. You can try it out in your own browser!

RoXi supports datalog reasoning using N3 syntax. The whole N3 spec is currently not supported yet, but this is work in progress. Currently we support rules with plain datalog expressivity.

RoXi Server

How to build RoXi in server mode:

cd server
cargo build --release
cd ..
./target/release/server --abox <ABOX> --tbox <TBOX> 

The following parameters can be defined:

1. --abox file location to abox statements. File in TTL format (.ttl) supported.
2. --tbox file location to tbox statements. Files in TTL format (.ttl) and N3 Logic (.n3) supported. 3--trace [optional] boolean for printing reasoning traces

For example:

./target/release/server --abox examples/abox.ttl --tbox examples/rules.n3 

Using RoXi with Javascript/Typescript from NPM in your Node project

You can add find the Javascript bindings directly on NPM npm i roxi-js

See the examples below on how to use RoXi in JS mode

Building RoXi for Javascript/Typescript usage

Make sure that you have wasm-pack, cargo-generate and npm installed. Instructions to install those can be found here.

You can use roxi both inside a browser as well as a Node JS module.

Using Roxi inside a browser.

cd js
wasm-pack build

A pkg folder will be generated which contains the generated web assembly modules which can be used in the browser. You can install the package inside your application with npm install --save-dev /path/to/roxi/js/pkg More information and a tutorial regarding using Webassembly within webpages using webpack can be found here

Using Roxi as a Node Module.

cd js
wasm-pack build --target nodejs

You can install the package with npm install --save-dev path/to/roxi/js/pkg. The package will be found in your dependencies as,

  "dependencies": {
    "roxi-js": "file:../roxi/js/pkg"
  }

Go to package.json of your project and add:

  "type": "module"

Examples of RoXi in JS/TS mode

Example usage when using the static reasoner:

import {RoxiReasoner} from "roxi-js";
// create the reasoner
const reasoner = RoxiReasoner.new();
// add ABox 
reasoner.add_abox("<http://example2.com/a> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.test.be/test#SubClass> .");
// Add rules
reasoner.add_rules("@prefix test: <http://www.test.be/test#>.\n @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.\n {?s rdf:type test:SubClass. }=>{?s rdf:type test:SuperType.}");
// perform materialization through forward chaining
reasoner.materialize();
// log a dump of the materialized abox
console.log(reasoner.get_abox_dump());

Example usage when using the RSP engine:

import {JSRSPEngine} from "roxi-js";
// callback function
function callback(val) {
    console.log(val);
}
let width = 10;
let slide = 2;
let rules = "@prefix test: <http://test/>.\n @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.\n {?x test:isIn ?y. ?y test:isIn ?z. }=>{?x test:isIn ?z.}";
let abox = "";
let query = "Select * WHERE{ ?x <http://test/isIn> ?y}";
// create the engine
let rspEngine = JSRSPEngine.new(width,slide,rules,abox,query,callback);
// add some data
let event = "<http://test/0> <http://test/isIn> <http://test/1>.";
let currentTimeStamp = 0;
rspEngine.add(event, currentTimeStamp);
...
let event = ... ;
currentTimeStamp += 1;
rspEngine.add(event, currentTimeStamp);