code: def get_entity_mm():
      
      type_builtins = {
              'integer': SimpleType(None, 'integer'),
              'string': SimpleType(None, 'string')
      }
      entity_mm = metamodel_from_file(join(this_folder, 'entity.tx'),
                                      classes=[SimpleType],
                                      builtins=type_builtins)
  
      return entity_mm
docs: Builds and returns a meta-model for Entity language.