code: func SplitPrefix(path string) ([]string, string) {
  	parts := strings.SplitN(path, ":", 2)
  	if len(parts) == 2 && len(parts[0]) > 0 {
  		return strings.Split(parts[0], "."), parts[1]
  	}
  	return nil, path
  }
docs: // SplitPrefix returns a tuple specifying the document prefix and the file
  // path.