This service provides the API to define the actual types, inference rules and validation rules
for a textual DSL developed with Langium in order to include them into the Langium lifecycle.
This function needs to be called once to trigger the initialization process.
Depending on the implemention, it might or might not call onInitialize() from the LangiumTypeSystemDefinition.
This service provides the API to define the actual types, inference rules and validation rules for a textual DSL developed with Langium in order to include them into the Langium lifecycle.