code: public IGeneratorSet getGeneratorSet()
      {
      JsonValidationService service = JsonValidationService.newInstance();
      JsonSchema schema = service.readSchema( getClass().getResourceAsStream( "/schema/generators-schema.json"));
      ProblemHandler handler = ProblemHandler.throwing();
      try( JsonReader reader = service.createReader( stream_, schema, handler))
        {
        JsonObject json;
        try
          {
          json = reader.readObject();
          }
        catch( Exception e)
          {
          throw new GeneratorSetException( "Invalid generator set definition", e);
          }
  
        return GeneratorSetJson.asGeneratorSet( json);
        }
      }
docs: Returns a {@link IGeneratorSet} instance.