The Natural Rule Language (NRL) Parser

This package contains a parser and manipulation API for the Natural Rule Language. The Natural Rule Language is an open specification hosted on SourceForge, at http://nrl.sourceforge.net. Its principal purpose is to enable the expression of constraints over models in a restricted language that is reasonably close to English.

All code and documentation contained in this package is licenced under the terms of the Mozilla Public Licence, version 1.1. By downloading this package you agree to be bound by the terms. Please refer to the NOTICES file for copyright information and information on bundled third party packages.

Usage

This package contains a grammar-driven parser and abstract syntax tree implementation of the NRL. Using this package you can:

Parse NRL files. This will tell you if the rules you have written are correct and valid against a model.
Write Java programs that transform NRL rules for execution on target platforms - "mapping" programs. For example, for execution in Java against Java objects, in CLiX against XML, or in your favourite programming language.

Programming Interface

The NRL parser comes with an API for calling it programmatically. The complete JavaDoc for all packages is included. The most important package in the API for any kind of mapping or manipulation is the net.sourceforge.nrl.ast package, which contains the representation of the language as an abstract syntax tree. If you intend to use this API, please make sure you are familiar with the NRL Specification, which documents the meaning of the constructs.

You might also want to browse the samples directory for examples of how to use the parser.

Contact

More information is available on http://nrl.sourceforge.net.