Generation rules must be contained in a RulesComposer project.
To create an RulesComposer project:
The created project shows up in the Project Explorer view.

The project contains a src folder, where we will put the RulesComposer source files. It also references libraries:
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sample
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Tutorial

Navigating through the
RulesComposer/MDWorkbench user interface
Creating a RulesComposer/MDWorkbench
Project