docs: @Nonnull
    public IHCNode convertToXHTMLFragmentOnDemand (@Nullable final String sText)
    {
      if (looksLikeXHTML (sText))
      {
        final IMicroContainer aCont = unescapeXHTMLFragment (sText);
        if (aCont != null)
          return new HCDOMWrapper (aCont);
        LOGGER.error ("Failed to unescape XHTML:\n" + sText);
      }
      return new HCTextNode (sText);
    }