= EXPRESS grammar in ANTLR4

//image:https://github.com/lutaml/expressir/workflows/ubuntu/badge.svg[ubuntu] //image:https://github.com/lutaml/expressir/workflows/macos/badge.svg[macos] //image:https://github.com/lutaml/expressir/workflows/windows/badge.svg[windows]

== Purpose

This is the EXPRESS grammar file according to ISO 10303-11, and is tested to work with all ISO 10303 SMRL EXPRESS files that are valid.

These files in SMRL have been determined to be deviated from the grammar and are therefore invalid.

== Contributing

First, thank you for contributing! We love pull requests from everyone. By participating in this project, you hereby grant https://www.ribose.com[Ribose Inc.] the right to grant or transfer an unlimited number of non exclusive licenses or sub-licenses to third parties, under the copyright covering the contribution to use the contribution by all means.

Here are a few technical guidelines to follow:

• Open an https://github.com/lutaml/expressir/issues[issues] to discuss a new feature.
• Write tests to support your new feature.
• Make sure the entire test suite passes locally and on CI.
• Open a Pull Request.
• https://github.com/thoughtbot/guides/tree/master/protocol/git#write-a-feature[Squash your commits] after receiving feedback.
• Party!

== License

This grammar is developed by Ribose Inc. and open sourced under a BSD-2 clause license.

== Credits

We thank the support provided by NIST, Boeing and ISO/TC 184/SC 4/TF 1.