code: func (tag *Tag) GetFrames(id string) []Framer {
  	if f, exists := tag.frames[id]; exists {
  		return []Framer{f}
  	} else if s, exists := tag.sequences[id]; exists {
  		return s.Frames()
  	}
  	return nil
  }
docs: // GetFrames returns frames with corresponding id.
  // It returns nil if there is no frames with given id.