code: func (a *API) FetchAnnotation(cid CIDType) (*Annotation, error) {
  	if cid == nil || *cid == "" {
  		return nil, fmt.Errorf("Invalid annotation CID [none]")
  	}
  
  	annotationCID := string(*cid)
  
  	matched, err := regexp.MatchString(config.AnnotationCIDRegex, annotationCID)
  	if err != nil {
  		return nil, err
  	}
  	if !matched {
  		return nil, fmt.Errorf("Invalid annotation CID [%s]", annotationCID)
  	}
  
  	result, err := a.Get(annotationCID)
  	if err != nil {
  		return nil, err
  	}
  
  	if a.Debug {
  		a.Log.Printf("[DEBUG] fetch annotation, received JSON: %s", string(result))
  	}
  
  	annotation := &Annotation{}
  	if err := json.Unmarshal(result, annotation); err != nil {
  		return nil, err
  	}
  
  	return annotation, nil
  }
docs: // FetchAnnotation retrieves annotation with passed cid.