code: func (b *BigIP) InternalDataGroups() (*DataGroups, error) {
  	var dataGroups DataGroups
  	err, _ := b.getForEntity(&dataGroups, uriLtm, uriDatagroup, uriInternal)
  	if err != nil {
  		return nil, err
  	}
  
  	return &dataGroups, nil
  }
docs: // InternalDataGroups returns a list of internal data groups.