# Wongi.Engine v0.9.20 - Table of Contents

A pure-Elixir rule engine.

## Pages

- [Differences from the Ruby library](ruby.md)

## Modules

- [Wongi.Engine](Wongi.Engine.md): This is a pure-Elixir forward chaining inference engine based on the classic
Rete algorithm.
- [Wongi.Engine.Aggregates](Wongi.Engine.Aggregates.md): Aggregate helpers.
- [Wongi.Engine.DSL](Wongi.Engine.DSL.md): Rule definition functions.

- [Wongi.Engine.DSL.Clause](Wongi.Engine.DSL.Clause.md): Rule matcher.
- [Wongi.Engine.DSL.Has](Wongi.Engine.DSL.Has.md): Positive assertion.
- [Wongi.Engine.DSL.Var](Wongi.Engine.DSL.Var.md): Variable declaration.
- [Wongi.Engine.Entity](Wongi.Engine.Entity.md): An iterator-like object that represents a set of facts about a single subject.

- [Wongi.Engine.Filter](Wongi.Engine.Filter.md): Filters tokens based on a predicate.
- [Wongi.Engine.Token](Wongi.Engine.Token.md): An intermediate data structure representing a partial match.

- [Wongi.Engine.WME](Wongi.Engine.WME.md): A single fact.