code: def comment_from_tag(tag):
      
      if not tag:
          return None
      comment = Comment(name=tag.name,
                        meta={'description': tag.description},
                        annotations=tag.annotations)
      return comment
docs: Convenience function to create a full-fledged comment for a
      given tag, for example it is convenient to assign a Comment
      to a ReturnValueSymbol.