All Xtext components rely on Google Guice dependency injection, even the classes that Xtext generates for your DSL. This means that in your classes, if you need to use a class from Xtext, you just have to declare a field of such type with the @Inject annotation.
The injection mechanism allows a DSL developer to customize basically every component of the Xtext framework. This boils down to another property of dependency injection, which, in fact, inverts dependencies. The Xtext runtime can use your classes without having a dependency to its implementer. Instead, the implementer has a dependency on the interface defined by the Xtext runtime. For this reason, dependency injection is said to implement inversion of control and the dependency inversion principle.
When running the MWE2 workflow, Xtext generates both a fully configured module and an empty module that inherits from the generated one. This allows you to override generated or default bindings. Customizations are...