def renderLinkComment(self, relpath=""):
        """renderLinkComment() is called to render the DP in link:comment form, as a separate paragraph.
        relpath is as for renderLink() above.
        Return value should be a valid HTML string."""
        items = []
        link = self.renderLink(relpath) or ""
        if link:
            items.append(link)
        comment = self.dp.comment or ""
        if comment:
            comment = comment.replace("<", "&lt;").replace(">", "&gt;")
            items.append(comment)
        if items:
            return "<P>" + ": ".join((items)) + "</P>"
        else:
            return ""
renderLinkComment() is called to render the DP in link:comment form, as a separate paragraph.
        relpath is as for renderLink() above.
        Return value should be a valid HTML string.